Developer & Code

JSON Schema Validator Every error at its exact path, by the real rules. CONTRIBUTING.md Generator Every command in it is one your project runs. Changelog Generator from Git Log From commits to a checked changelog and version. Commit Message Builder and Checker Proposed from the diff, checked against the spec. README Generator from Your Project Your manifest, your scripts, your README. AST Explorer Click the code, see the node; click the node, see the code. Favicon Maker and Preview One picture in, every icon size out. Webhook Signature Checker Find out why a signature does not match. IP Address Lookup Who holds the block, from the registry itself. Dockerfile Linter Every finding with its reason and a fix. DNS Record Lookup Ask two resolvers, compare the answers. JWT Debugger Real signatures, checked on your device. JSON Formatter and Validator Exact errors, numbers kept as written. SCSS to CSS Compiler The real Sass compiler, on your device. Hash and Checksum Generator Check a download against its published hash. Union-Find Visualizer Who is connected to whom, answered almost for free. Floating-Point Explorer The number you typed, and the one you got. Edit Distance Visualizer The fewest changes from one word to another. Trie Autocomplete Visualizer Words that begin alike share the road. B-Tree Visualizer Wide, shallow, and always balanced. Bloom Filter Visualizer Probably yes, definitely no. LZ77 Compression Visualizer Say it once, then point back at it. Hamming Code Visualizer Flip a bit. The code tells you which one. Finite Automaton Builder What a pattern becomes when a machine reads it. Binary Heap Visualizer A tree that lives in an array. Hash Table Visualizer Where a key lands, and what it bumps into. Huffman Coding Visualizer Common letters get short codes. Watch why. Quaternion Rotation Visualizer Four numbers that turn anything, without the lock. Turing Machine Simulator A tape, a head, a table of rules. That is all. URL Parser and Builder Every part of a link, read the way a browser reads it. Open Source License Generator The right license, in its exact official words. Bookmarklet Generator Write it, test it safely, drag it to the bar. JF JSON Formatter & Validator Format, validate, and beautify JSON with syntax highlighting and error detection. BE Base64 Encoder / Decoder Encode text or files to Base64 and decode Base64 strings back to their original form. SF SQL Formatter & Beautifier Format and indent SQL queries for better readability across all major dialects. HM HTML to Markdown Converter Convert HTML markup into clean Markdown syntax with support for tables and lists. MH Markdown to HTML Live Preview Write Markdown and see the rendered HTML output in real time with live preview. DP Diff / Patch Viewer Visualize unified diffs and patch files with color-coded additions and deletions. RT Regex Tester & Debugger Test regular expressions against sample text with real-time match highlighting. UE URL Encoder / Decoder Encode special characters for URLs or decode percent-encoded URL strings. CM CSS Minifier / Beautifier Minify CSS for production or beautify compressed CSS for readability. JM JavaScript Minifier / Beautifier Minify JavaScript to reduce file size or beautify minified code for debugging. JD JWT Decoder Decode and inspect JSON Web Tokens to view header, payload, and signature claims. AR API Request Builder Build HTTP requests visually with method, headers, body, and params. Send via fetch and see the full response. Like a mini Postman. UG UUID / GUID Generator Generate unique UUIDs (v4) and GUIDs individually or in bulk with one click. WT WebSocket Tester Connect to a WebSocket endpoint, send and receive messages, and see a live message log with timestamps. JS JSON Structure Visualizer Visualize JSON data as an interactive collapsible tree with type annotations. CF CSS Flexbox Playground Experiment with Flexbox properties visually and copy the generated CSS code. CG CSS Grid Layout Generator Design CSS Grid layouts visually with drag-and-drop and export clean CSS code. CS Code Screenshot Generator Create beautiful code screenshots with syntax highlighting, themes, and padding. SC SVG Code Editor & Live Preview Edit SVG markup with live rendering, syntax highlighting, and instant preview. CT CSS Transition Builder Design CSS transitions with visual easing curve editor and live preview on hover/click states. CB Cubic Bezier Easing Editor Drag control points to create custom cubic-bezier timing functions with comparison to standard easing presets. CT CSS Transform Visualizer Experiment with translate, rotate, scale, skew, and perspective transforms on elements with live CSS output. TC Tailwind Color Shade Generator Input a brand color and auto-generate a full 50-950 Tailwind CSS color palette with dark mode support. SS Spacing Scale Generator Generate a consistent spacing scale (4px, 8px, 12px...) using a base unit and ratio for design systems. DT Design Token Generator Create and export design tokens for colors, spacing, typography, and shadows in JSON, CSS, or SCSS format. RB Responsive Breakpoint Visualizer Define custom breakpoints and see how a layout grid changes across screen widths with live resize handles. AI App Icon Generator Upload an image and generate app icons in all required sizes for iOS, Android, and web with rounded corners. SS SVG Sprite Builder Combine multiple SVG icons into a single sprite file with symbol IDs for efficient web usage. SO SVG Optimizer (SVGO) Paste or upload SVG code and optimize it by removing metadata, comments, and unnecessary attributes. SC SVG to CSS Background Converter Convert SVG graphics to CSS background-image data URIs with proper encoding and minification. UC UI Component Library Preview Browse and customize common UI components (buttons, cards, modals, navbars) with live code preview. CB CSS Button Generator Design buttons visually with gradients, borders, shadows, hover states and copy the complete CSS. CL CSS Loading Spinner Generator Create animated loading spinners and progress indicators with pure CSS and customizable speed/color. CT CSS Tooltip Generator Design and generate pure CSS tooltips with arrow positioning, animations, and responsive behavior. HC HTML/CSS Table Style Generator Design styled HTML tables with striped rows, hover effects, responsive behavior, and export the code. PB Progress Bar CSS Generator Design animated progress bars with gradients, stripes, labels, and responsive width using pure CSS. VR Vertical Rhythm Calculator Calculate line-heights and margins to maintain consistent vertical rhythm across all text elements. FF Font Fallback Tester Test font stacks and see exactly which fallback font renders for each character in your text. CG CSS Grid Template Areas Editor Visually define grid-template-areas by painting named regions on a grid and export clean CSS. RL Responsive Layout Tester Preview HTML layouts at multiple viewport widths simultaneously with device frame overlays. CS CSS Shape Generator Create triangles, circles, hearts, stars, and other shapes using pure CSS with visual controls. SA Scroll Animation Builder Design scroll-triggered CSS animations with visual keyframe editor and IntersectionObserver code output. CS CSS Scrollbar Generator Design custom scrollbar styles with webkit and standard CSS scrollbar properties with live preview. DS Database Schema Designer Design database schemas visually with tables, columns, types, indexes, and relationship lines. VS Visual Sitemap Builder Design website sitemaps as visual tree diagrams with page types, URL slugs, and hierarchy levels. GC Glassmorphism Card Generator Design frosted-glass cards with customizable backdrop-filter, border, gradient, and shadow properties. CM CSS Morphing Shape Animator Create smooth shape-morphing animations between two SVG/CSS shapes with keyframe timeline controls. IF Icon Font Generator Upload SVG icons and generate a custom icon font with CSS class mappings and specimen page. EF Emoji Favicon Generator Generate favicons from emojis or single characters with background color and padding options. PT Pricing Table Generator Design responsive pricing tables with plan tiers, feature lists, and highlighted recommended options. CC CSS Custom Properties Generator Define design tokens as CSS custom properties with dark mode variants and usage snippets. TC Tailwind CSS Config Generator Visually configure Tailwind CSS theme extensions for colors, spacing, and breakpoints with config output. CM CSS Multi-Column Layout Generator Configure CSS multi-column layouts with column count, gap, rule, and span properties with live preview. AS Animated SVG Generator Create SVG animations with path drawing, morphing, and transform keyframes using SMIL or CSS. LA Lottie Animation Previewer Upload and preview Lottie JSON animations with playback controls, speed adjustment, and frame inspection. CT CSS Text Underline Decorator Design custom text underlines using text-decoration, border-bottom, and background-image techniques. CB CSS Background Pattern Generator Create pure CSS background patterns (checkerboard, stripes, polka dots, zigzag) without images. CG CSS Gradient Animator Create animated gradients that shift and flow with customizable speed, angle, and color stops. CA CSS Aspect Ratio Box Generator Generate responsive aspect ratio containers using the aspect-ratio property or padding hack technique. CF CSS Form Input Style Generator Design styled form inputs, checkboxes, radio buttons, and selects with consistent cross-browser CSS. CC CSS Card Design Generator Design content cards with image, title, description, and CTA with hover effects and responsive CSS. CN CSS Navigation Bar Generator Build responsive navigation bars with dropdowns, hamburger menus, and sticky behavior plus code export. CF CSS Footer Generator Design responsive website footers with columns, social links, copyright, and newsletter signup styles. CH CSS Hero Section Builder Design hero sections with background images/video, overlay gradients, CTAs, and responsive text layout. PL Page Layout Generator Generate common page layouts (sidebar + content, 3-column, masonry) with CSS Grid or Flexbox code. CP CSS Parallax Scroll Generator Create parallax scrolling sections with configurable depth layers and pure CSS perspective transforms. RI Responsive Image Map Generator Create clickable image maps with hotspot areas that scale responsively across screen sizes. CS CSS Sprite Animation Tool Create frame-by-frame animations from sprite sheets using CSS steps() timing function. CM CSS Media Query Generator Build responsive CSS media queries for common devices and custom breakpoints with code snippets. RF Responsive Font Size Calculator Calculate fluid typography using CSS clamp() with min/max size and viewport-based scaling. CC CSS Container Query Builder Experiment with CSS container queries visually with resizable containers and responsive component code. AS API Schema Visualizer Paste OpenAPI/Swagger JSON and visualize endpoints, request/response schemas as interactive diagrams. CS CSS Shadow Palette Generator Generate a consistent shadow elevation system (small, medium, large, xl) for a design system. IB Image to Base64 Converter Encode images to Base64 data URI strings for embedding in HTML/CSS. BR Barcode Reader Scan and decode barcodes from uploaded images or live camera. AI App Icon Generator Generate iOS and Android app icons in all required sizes from a single image. IC Image to CSS Gradient Analyze image colors and generate matching CSS gradient code. SE SVG Editor Edit SVG files visually with path manipulation, colors, transforms, and text editing. SV SVG ViewBox Editor Adjust SVG viewBox, dimensions, and coordinate system with visual preview. SS SVG Sprite Generator Combine multiple SVG icons into a single SVG sprite sheet with symbol references. ID Image to Data URL Convert images to complete data URL format for direct HTML/CSS embedding. CS CSS Sprite Generator Generate CSS sprite sheets from multiple images with automatic CSS coordinate code. RI Responsive Image Generator Generate multiple sized versions of images for responsive srcset attributes. IM Image Map Generator Create clickable HTML image maps with rectangular, circular, and polygon hotspots. IH Image Hex Color Mapper Map every pixel in an image to its nearest named CSS color or hex value. LA Lottie Animation Player Preview and play Lottie JSON animation files with speed and loop controls. 9P 9-Patch Image Generator Create Android 9-patch images with stretchable regions for button backgrounds. EI Email Image Slicer Slice images into table-cell-friendly pieces for HTML email templates. CS Code Screenshot Maker Create beautiful code screenshots with syntax highlighting and custom themes. FS Favicon Set Generator Generate complete favicon sets (ICO, PNG, SVG, Apple Touch) from a single image. SR Screen Resolution Detector Detect and display your screen resolution, viewport size, pixel ratio, color depth, and device orientation. BI Browser Info Detector Detect browser name, version, OS, user agent, installed plugins, and supported Web APIs in your current browser. JT JSON to TypeScript Interface Generator Paste JSON and auto-generate TypeScript interfaces with nested type inference and optional properties. CE Cron Expression Generator Build and validate cron expressions with a visual editor showing human-readable schedule descriptions. HT HTML Table Generator Build HTML tables visually with cell merging, styling options, and clean code export. TC Tailwind CSS Color Picker Browse and copy Tailwind CSS color classes with visual swatches and HEX/RGB value references. CP chmod Permission Calculator Calculate Unix file permissions using checkboxes and see the numeric chmod value with command preview. JP JSON Path Finder Paste JSON and click any value to get its JSONPath or dot-notation path for use in code or queries. CU CSS Unit Converter Convert between px, em, rem, vw, vh, pt, cm, mm, and inch CSS units with a configurable root font size. SM SQL to MongoDB Query Converter Convert SQL SELECT queries to equivalent MongoDB find() syntax with projection and sort support. XF XML Formatter & Validator Format, validate, and beautify XML with syntax highlighting, indentation control, and error detection. UA User Agent Parser Paste a user agent string and extract browser, OS, device type, and rendering engine details. JS JSON Schema Generator Paste JSON and auto-generate a JSON Schema with type inference, required fields, and validation rules. JG JSON to Go Struct Generator Generate Go struct definitions from JSON data with proper field naming and JSON tags. SC Subnet Calculator Calculate IP subnet details including network address, broadcast address, host range, and CIDR notation. CC CIDR Calculator Convert between CIDR notation and subnet masks with network range and host count calculations. MC Markdown Cheat Sheet Interactive Markdown reference with syntax examples, live preview, and one-click copy for common patterns. GC Git Command Builder Build git commands interactively by selecting operations, options, and flags with explanation tooltips. JK JavaScript Keycode / Event Tester Press any key to see its keyCode, key, code, and which values with event properties for development reference. CL CSS Loader / Spinner Generator Create animated CSS loading spinners and skeleton loaders with customizable size, color, and speed. HM HTML Minifier Minify HTML by removing comments, whitespace, and optional tags while preserving functionality. IA IP Address Converter Convert IP addresses between decimal, binary, hexadecimal, and integer formats for IPv4 and IPv6. II IPv4 to IPv6 Converter Convert IPv4 addresses to IPv6 mapped and compatible formats with detailed notation breakdown. IC IPv6 Compressor / Expander Compress IPv6 addresses to short notation and expand abbreviated IPv6 addresses to full 128-bit format. NC Network Calculator Calculate network details including wildcard masks, supernetting, VLSM subnetting, and address allocation planning. IR IP Range Calculator Calculate IP address ranges from start/end addresses or CIDR blocks with overlap detection and merging. MA MAC Address Lookup Look up the manufacturer and organization associated with a MAC address OUI prefix from a local database. MA MAC Address Generator Generate random MAC addresses with configurable vendor OUI prefixes and format options (colon, dash, dot). PN Port Number Lookup Search common network port numbers and their associated services, protocols, and security implications. HG .htaccess Generator Generate Apache .htaccess files with redirects, security headers, caching rules, and access control directives. NC Nginx Config Generator Generate Nginx server block configurations with SSL, security headers, reverse proxy, and caching settings. CC CRC32 Calculator Calculate CRC32 checksums for text and files using standard and Castagnoli polynomial implementations. XF XML Formatter & Validator Format, validate, and minify XML documents with syntax highlighting and schema validation. YJ YAML to JSON Converter Convert between YAML and JSON formats with validation, formatting, and error highlighting. TJ TOML to JSON Converter Convert between TOML and JSON configuration formats with validation and formatting. JT JSONPath Tester Test JSONPath expressions against JSON data with real-time result highlighting and path builder. JT JSON to TypeScript Converter Generate TypeScript interfaces and types from JSON data with configurable naming and optional/required field detection. JY JSON to YAML Converter Convert JSON data to YAML format with configurable indentation, flow style options, and sorting. UT Unix Timestamp Converter Convert between Unix timestamps and human-readable dates with timezone support and relative time display. EC Epoch Converter Convert epoch/Unix timestamps to dates and dates to timestamps with millisecond precision and timezone handling. TD Text Diff Checker Compare two text blocks side-by-side with character-level and line-level diff highlighting. CE Cron Expression Parser Parse cron expressions to show human-readable descriptions and calculate the next N execution times. WI What Is My IP Address Display your current public IPv4 and IPv6 addresses with geolocation, ISP, and browser fingerprint details. MT MIME Type Lookup Look up MIME types by file extension and find file extensions for MIME types with a searchable database. HE Hex Editor View and edit binary files in hexadecimal with ASCII sidebar, search, and byte-level editing capabilities. NM Network Mask Converter Convert between subnet mask formats: dotted decimal, CIDR notation, wildcard mask, and binary representation. IS IP in Subnet Checker Check if a given IP address belongs to a specific subnet/CIDR range with batch checking support. VC VLSM Calculator Calculate Variable Length Subnet Mask allocations to efficiently divide a network into subnets of different sizes. SC Supernet Calculator Calculate supernets by aggregating multiple contiguous subnets into a single larger network (route summarization). BC Bandwidth Calculator Calculate file transfer times, required bandwidth, and data throughput for various connection speeds. CT Content-Type Reference Browse and search MIME content types with associated file extensions, descriptions, and usage examples. CC cURL to Code Converter Convert cURL commands to equivalent code in Python, JavaScript, Go, PHP, Ruby, and other languages. JP JSON to Python Dict Convert JSON data to Python dictionary literals and dataclass definitions with type annotations. JJ JSON to Java Class Generate Java POJO classes from JSON data with Jackson/Gson annotations and builder pattern support. CM CSS Minifier Minify CSS code by removing whitespace, comments, and redundant syntax to reduce file size. JB JavaScript Beautifier Format and beautify minified JavaScript code with configurable indentation and brace style options. CB CSS Beautifier Format and beautify minified CSS code with configurable indentation, brace placement, and property sorting. HB HTML Beautifier Format and indent HTML code with configurable tag indentation, attribute wrapping, and void tag handling. JE JWT Expiry Calculator Calculate JWT expiration timestamps from durations and convert exp/iat/nbf claims to human-readable dates. WA Web App Manifest Generator Generate PWA manifest.json files with app name, icons, theme colors, and display mode configuration. CN CIDR Network Visualizer Visualize CIDR ranges and subnet allocations on an interactive IP address space map with overlap detection. WM Wildcard Mask Calculator Calculate wildcard masks from subnet masks and CIDR notation for Cisco ACL and OSPF configuration. TD Test Data Generator Generate realistic fake data (names, addresses, emails, phones) for testing without using real personal information. TC Test Credit Card Generator Generate valid-format test credit card numbers using the Luhn algorithm for development and testing purposes. TC Timestamp Converter Convert between various timestamp formats including ISO 8601, RFC 2822, Unix, Windows FILETIME, and more. SE String Escape / Unescape Escape and unescape strings for JSON, HTML, XML, JavaScript, CSV, SQL, and regex contexts. WS Webhook Signature Calculator Calculate and verify webhook HMAC signatures for Stripe, GitHub, Shopify, and other popular webhook providers. AS AWS Signature V4 Calculator Calculate AWS Signature Version 4 for API requests with step-by-step signing process visualization. EF .env File Validator Validate .env file syntax, detect duplicate keys, check for exposed secrets, and compare with .env.example. GG .gitignore Generator Generate .gitignore files for your project by selecting from templates for languages, frameworks, and IDEs. DG Dockerfile Generator Generate Dockerfiles from an interactive builder with best practice suggestions for common tech stacks. DC Docker Compose Generator Build docker-compose.yml files interactively with service templates for databases, caches, and web frameworks. GA GitHub Actions Generator Generate GitHub Actions workflow YAML files with pre-built templates for CI/CD, testing, and deployment. NP Network Packet Analyzer Parse and analyze hex dumps of network packets to display Ethernet, IP, TCP/UDP headers and payload data. BM Bit Manipulation Calculator Perform bitwise operations (AND, OR, XOR, NOT, shifts) with visual binary representation and step explanation. SC SSH Config Generator Generate SSH client config files (~/.ssh/config) with host entries, jump proxies, and key specifications. AK Authorized Keys Manager Parse, validate, and manage SSH authorized_keys file entries with command restrictions and options. KH Known Hosts Parser Parse and decode SSH known_hosts file entries to display host, key type, and fingerprint information. DR DNS Record Builder Build and validate DNS records (A, AAAA, CNAME, MX, TXT, SRV, CAA) with syntax checking and TTL guidance. WK .well-known URL Reference Browse the IANA .well-known URI registry with descriptions, RFC references, and implementation guidance. OS OAuth Scope Builder Build OAuth 2.0 scope strings for popular APIs (Google, GitHub, Microsoft, Slack) with permission descriptions. CS CSS Specificity Calculator Calculate and compare CSS selector specificity scores with visual breakdown of ID, class, and element weights. RD Responsive Design Checker Preview website layouts across mobile, tablet, and desktop breakpoints with resizable iframe testing. HF HTML Formatter & Beautifier Format, indent, and beautify HTML code with proper nesting, attribute alignment, and minification options. CF CSS Formatter & Beautifier Format, organize, and beautify CSS code with property sorting, indentation control, and minification. RT Resource Timing Analyzer Visualize resource loading waterfall using the Resource Timing API with DNS, TCP, and download breakdowns. CT CSS Text Shadow Generator Create CSS text shadow effects with visual editor for offset, blur, color, and layered shadow combinations. CB CSS Border Radius Generator Design CSS border-radius values with visual editor for individual corners and complex shape creation. CF CSS Flexbox Generator Build CSS flexbox layouts visually with controls for direction, wrap, justify, align, and item properties. CG CSS Grid Generator Design CSS Grid layouts visually with template columns, rows, gap, and area naming with code export. CT CSS Transform Generator Build CSS transform chains with visual controls for rotate, scale, skew, translate, and perspective. CM CSS Media Query Generator Generate responsive CSS media queries for common breakpoints, devices, and screen orientations. TC Tailwind to CSS Converter Convert Tailwind CSS utility classes to standard CSS properties with proper grouping and formatting. CT CSS to Tailwind Converter Convert standard CSS properties to equivalent Tailwind CSS utility classes with class name output. XT XPath Tester Test XPath expressions against XML/HTML documents with node selection, result display, and expression builder. CS CSS Selector Tester Test CSS selectors against HTML markup with matched element highlighting and specificity calculation. HJ HTML to JSX Converter Convert HTML markup to JSX/React syntax with className, htmlFor, style object, and self-closing tag conversion. SC SVG to CSS Background Converter Convert SVG code to CSS background-image data URI with URL encoding and optimization. PR PX to REM Converter Convert pixel values to rem units and vice versa with customizable root font size base value. EU EM Unit Calculator Calculate em values relative to parent font size with nested em computation and px conversion. VU Viewport Unit Calculator Calculate and convert vh, vw, vmin, and vmax CSS viewport units based on screen dimensions. LH Line Height Calculator Calculate optimal CSS line-height values based on font size and reading comfort with visual preview. BS Browser Support Checker Check CSS property and JavaScript API browser compatibility with Can I Use data and polyfill suggestions. SR Screen Resolution Tester Display current screen resolution, viewport size, device pixel ratio, and color depth information. BC Browser Cookie Viewer View, search, and analyze browser cookies for the current domain with expiry and attribute details. LS Local Storage Viewer Browse, search, edit, and export localStorage and sessionStorage data with JSON formatting support. IB IndexedDB Browser Browse IndexedDB databases, object stores, and records with search, filtering, and export capabilities. TJ TypeScript to JSON Schema Convert TypeScript interfaces and types to JSON Schema definitions with property type mapping. CD Code Diff Viewer Compare two code blocks with syntax-highlighted side-by-side and unified diff views. HL HTML Live Preview Write HTML, CSS, and JavaScript with real-time live preview rendering in an isolated sandbox iframe. ML Markdown Live Preview Write and preview Markdown with syntax highlighting, GitHub Flavored Markdown, and export to HTML. EH Email HTML Preview Preview HTML email templates with inbox rendering simulation for desktop and mobile email clients. WS Website Screenshot Tool Capture screenshots of web pages at different viewport sizes using HTML canvas and iframe rendering. PS Page Size Checker Analyze total page weight, number of requests, and resource breakdown by type (JS, CSS, images, fonts). DU Data URI Generator Convert files to data URIs and data URIs back to files for inline embedding in HTML and CSS. WT Website Technology Checker Detect technologies, frameworks, CMS, analytics, and libraries used on web pages from HTML analysis. HT HTML Tag Stripper Remove specific or all HTML tags from content with options to keep text content and whitespace handling. CG CSS Glassmorphism Generator Design glassmorphism UI effects with backdrop-filter blur, transparency, and border controls with live preview. CN CSS Neumorphism Generator Create soft UI neumorphic designs with shadow controls, border-radius, and background color adjustments. CB CSS Button Generator Design custom CSS buttons with padding, colors, borders, shadows, hover effects, and transition animations. CT CSS Triangle Generator Generate CSS triangles using border tricks with direction, size, and color customization options. MM Microdata Markup Generator Generate Schema.org Microdata HTML markup as an alternative to JSON-LD for inline structured data. RM RDFa Markup Generator Create RDFa structured data attributes for HTML elements as an alternative to JSON-LD and Microdata. RI Responsive Image Srcset Generator Build responsive image srcset and sizes attributes for optimal image delivery across screen sizes. PE Picture Element Generator Generate HTML picture elements with source sets for art direction and format switching across breakpoints. MJ Manifest.json Validator Validate PWA manifest.json files for required fields, icon sizes, and Web App Manifest specification compliance. CA CSS Autoprefixer Add vendor prefixes to CSS properties for cross-browser compatibility with configurable browser targets. JF JavaScript Formatter & Beautifier Format and beautify JavaScript code with configurable indentation, semicolons, and bracket style options. JO JavaScript Obfuscator Obfuscate JavaScript code with variable renaming, string encoding, and control flow flattening for protection. HE HTML Encoder for Code Display Encode HTML code for safe display in web pages by escaping angle brackets, quotes, and ampersands. MR Meta Refresh Tag Generator Create HTML meta refresh tags for page redirects and auto-refresh with configurable delay timers. LR Link Rel Tag Generator Generate HTML link rel tags for canonical, alternate, prev/next, preload, and icon references. WC Website Carbon Calculator Estimate the carbon footprint of web pages based on page weight, data transfer, and green hosting indicators. FT Fluid Typography Calculator Calculate CSS clamp() values for fluid responsive typography between minimum and maximum viewport sizes. GC Gzip Compression Tester Check if a website serves gzip or brotli compressed responses with compression ratio and size savings display. CC Cache-Control Header Generator Build Cache-Control HTTP headers with max-age, s-maxage, no-cache, no-store, and immutable directives. EH ETag Header Checker Check and validate ETag response headers for proper caching behavior with weak vs strong ETag analysis. UC Unused CSS Finder Detect unused CSS selectors by comparing stylesheet rules against HTML markup for code cleanup. GF Google Fonts Optimizer Generate optimized Google Fonts embed code with font-display, preconnect, and subset configuration. TC Table of Contents Generator Generate HTML table of contents from heading structure with anchor links, nesting, and numbering options. SX Sitemap XML Validator Validate XML sitemap files against the sitemap protocol schema with error reporting and URL count display. HP HTML to Pug Converter Convert HTML markup to Pug (Jade) template syntax with proper indentation and attribute formatting. YV YAML Validator Validate YAML syntax with detailed error messages, line numbers, and formatted output display. TV TOML Validator Validate TOML configuration file syntax with error reporting and formatted JSON output conversion. EF .env File Generator Create .env environment variable files from templates with secret generation and format validation. IA Image Alt Tag Checker Scan HTML for images and verify alt attribute presence, length, keyword inclusion, and descriptive quality. OD OpenSearch Description Generator Generate OpenSearch XML description files for adding custom search to browser search bars. GR GitHub README Generator Build GitHub README.md files with badges, screenshots, installation steps, and contribution guidelines. SV Semantic Versioning Calculator Parse, compare, and increment semantic version numbers with range validation and compatibility checking. HR HTTP Request Builder Build and test HTTP requests with method, headers, body, and authentication options using the Fetch API. CF cURL to Fetch Converter Convert cURL commands to JavaScript Fetch API, Axios, and other HTTP client code formats. AR API Response Formatter Format and prettify API responses in JSON, XML, and HTML with syntax highlighting and collapsible sections. IS IP Subnet Calculator Calculate subnet masks, CIDR notation, network address, broadcast address, and host ranges for IPv4/IPv6. CS Crontab Schedule Explainer Enter cron expressions and see human-readable schedule descriptions with next execution time predictions. SS Sitelinks Searchbox Schema Generator Create WebSite structured data with SearchAction for Google sitelinks search box rich result display. WN Website Name Schema Generator Generate WebSite structured data markup to specify your preferred site name display in Google search results. QS Query String Builder Build URL query strings from key-value pairs with encoding, sorting, and duplicate key handling options. DP DNS Propagation Checker Check DNS record propagation across multiple global nameservers to verify DNS changes have taken effect. MR MX Record Checker Look up and validate MX records for email delivery configuration with priority and mail server details. TR TXT Record Lookup Query DNS TXT records to verify SPF, DKIM, DMARC, and domain verification entries for any domain. NL Nameserver Lookup Identify authoritative nameservers for a domain and check NS record configuration and delegation. HC HTML / CSS / JS Playground Write HTML, CSS, and JavaScript in a split-pane editor with instant live preview and console output. TP TypeScript Playground Write TypeScript with real-time transpilation to JavaScript, type checking, and error highlighting. PP Python Playground (WASM) Run Python code directly in the browser via Pyodide WebAssembly with standard library support. LP Lua Playground (WASM) Execute Lua scripts in the browser using Fengari WebAssembly with an interactive REPL console. RW Rust to WASM Playground Compile and run Rust snippets targeting WebAssembly with instant output and error reporting. GP Go Playground (WASM) Write and run Go code in the browser compiled to WebAssembly with standard output display. SP SQL Playground (SQLite WASM) Run SQL queries against an in-browser SQLite database with table creation, import, and result display. RC React Component Playground Build and preview React components with JSX, hooks, and state in an isolated sandbox environment. VC Vue Component Playground Create and preview Vue 3 single-file components with Composition API support in real time. SC Svelte Component Playground Write and preview Svelte components with reactive declarations, stores, and live rendering. WC Web Component Builder Create native Web Components with Shadow DOM, custom elements, and slots with live preview. WS WebGL Shader Playground Write GLSL vertex and fragment shaders with real-time WebGL rendering and uniform controls. CA Canvas API Playground Experiment with the HTML5 Canvas 2D API by writing draw commands and seeing instant visual output. WC WebGPU Compute Playground Write and run WebGPU compute shaders in WGSL with buffer visualization and timing output. WW WAT / WASM Text Format Playground Write WebAssembly Text Format (WAT), compile to WASM, and execute with interactive I/O. PP PHP Playground (WASM) Run PHP code directly in the browser using php-wasm with standard output and error display. CC C / C++ Playground (WASM) Compile and run C/C++ code in the browser via Emscripten WASM with console output and errors. TC Tailwind CSS Playground Write HTML with Tailwind CSS classes and see styled output instantly with the full utility library. SS Sass / SCSS Playground Write SCSS or Sass and compile to CSS in real time with variable, mixin, and nesting support. LC Less CSS Playground Write Less CSS with variables, mixins, and functions and see compiled CSS output instantly. PF Python Formatter (Black / autopep8) Format Python code using Black or autopep8 style rules with configurable line length and options. GF Go Formatter (gofmt) Format Go source code to canonical gofmt style with proper indentation and spacing. RF Rust Formatter (rustfmt) Format Rust code following rustfmt conventions with configurable edition and style options. JF Java Formatter Format Java source code with configurable brace style, indentation, and import ordering. YF YAML Formatter & Validator Format, validate, and lint YAML files with proper indentation and error highlighting. TF TOML Formatter & Validator Format and validate TOML configuration files with error highlighting and section sorting. GF GraphQL Formatter & Validator Format GraphQL queries, mutations, and schemas with syntax validation and pretty printing. HF HTML Formatter & Validator Format and validate HTML markup with proper indentation, tag matching, and W3C-style checks. PP Prettier Playground Run Prettier in the browser with full config options for JS, TS, CSS, HTML, JSON, and Markdown. EP ESLint Playground Run ESLint rules against JavaScript or TypeScript code with configurable rule sets and auto-fix preview. SP Stylelint Playground Lint CSS, SCSS, and Less with Stylelint rules, auto-fix suggestions, and severity reporting. PF PHP Formatter (PSR-12) Format PHP code following PSR-12 coding style with configurable indentation and brace placement. CF C# Formatter Format C# source code with proper namespace indentation, brace style, and member ordering. KF Kotlin Formatter Format Kotlin code following official Kotlin style guide conventions with ktlint compatibility. SF Swift Formatter Format Swift code following Apple style conventions with configurable indentation and line wrapping. PB Protocol Buffers Formatter Format and validate .proto files with proper indentation, field ordering, and syntax checking. TH Terraform / HCL Formatter Format HashiCorp Configuration Language (HCL) and Terraform files with canonical style. NC Nginx Config Formatter Format and validate Nginx configuration files with proper block indentation and directive sorting. CC Code Complexity Analyzer Measure cyclomatic complexity, lines of code, and maintainability index for JavaScript and TypeScript. DG Dependency Graph Visualizer Paste a package.json and visualize the dependency tree as an interactive force-directed graph. BS Bundle Size Analyzer Estimate JavaScript bundle sizes with tree-shaking simulation and package size comparison. SM Source Map Explorer Upload a source map file and explore the original source files with size contribution breakdown. CU CSS Unused Selector Finder Paste HTML and CSS to find unused selectors with coverage reporting and removal suggestions. IC Import Cost Estimator Check the size impact of npm package imports with minified and gzipped size estimates. HD HTML DOM Tree Viewer Paste HTML and explore the parsed DOM tree with element attributes, nesting depth, and structure. CP CSS Property Reference & Browser Support Search CSS properties with syntax, values, browser support data, and interactive examples. JE JavaScript Event Explorer Interact with a sandbox element and see every DOM event firing with properties, bubbling, and timing. RR Regex Railroad Diagram Visualize regular expressions as railroad diagrams showing groups, quantifiers, and alternatives. GD Git Diff Visualizer Paste unified diff output and see a color-coded side-by-side or inline diff with line-level statistics. JT JSONPath Tester Test JSONPath expressions against JSON documents with matched value highlighting and result display. OS OpenAPI / Swagger Editor Edit OpenAPI 3.x specs in YAML or JSON with live validation, Swagger UI preview, and endpoint listing. GS GraphQL Schema Explorer Paste a GraphQL schema and explore types, queries, mutations, and subscriptions in an interactive tree. GQ GraphQL Query Builder Build GraphQL queries visually by selecting fields from a schema with variable and fragment support. JS JSON Schema Editor Build and edit JSON Schema documents visually with type definitions, validations, and live preview. PJ Protobuf to JSON Converter Convert Protocol Buffer definitions to JSON representation and vice versa with field mapping. GR gRPC Request Builder Build gRPC requests visually from .proto definitions with message construction and serialization preview. OM OpenAPI Mock Data Generator Generate realistic mock JSON responses from an OpenAPI spec with faker-powered sample data. RA REST API Docs Generator Generate clean API documentation from OpenAPI specs with endpoint details, schemas, and examples. CC cURL to Code Converter Convert cURL commands to fetch, axios, requests, or other HTTP libraries in 15+ languages. WP Webhook Payload Builder Build webhook JSON payloads for GitHub, Stripe, Slack, and custom services with schema templates. O2 OAuth 2.0 Flow Visualizer Step through OAuth 2.0 authorization flows visually with token exchange diagrams and parameter details. PO Postman to OpenAPI Converter Convert Postman collection JSON files to OpenAPI 3.x specification format with full mapping. AR API Response Diff Tool Compare two API responses side by side with structural diff, value changes, and schema drift detection. SS Server-Sent Events Tester Connect to an SSE endpoint and display incoming events in real time with event type filtering. AR API Rate Limit Calculator Calculate optimal API rate limiting with token bucket and sliding window algorithms visualization. JR JSON to Rust Struct Generate Rust struct definitions with serde derives from JSON data with Option types for nullable fields. JC JSON to C# Class Generate C# class definitions from JSON with property attributes, nullable types, and JsonProperty annotations. JZ JSON to Zod Schema Generate Zod validation schemas from JSON data with type inference, optional fields, and array support. YT YAML to TOML Converter Convert YAML configuration files to TOML format and vice versa with structure preservation. JG JSON to GraphQL Schema Generate GraphQL type definitions from JSON data with query and mutation scaffolding. SD SQL DDL to JSON Schema Convert SQL CREATE TABLE statements to JSON Schema definitions with type mapping and constraints. EJ .env to JSON / YAML Converter Convert .env environment files to JSON, YAML, or Docker Compose env format and vice versa. MJ Markdown to JSON Converter Parse Markdown documents into structured JSON with headings, paragraphs, lists, and code blocks. GT GraphQL to TypeScript Generate TypeScript types and interfaces from GraphQL schema definitions and query documents. SD SQL DDL to Prisma Schema Convert SQL CREATE TABLE statements to Prisma schema models with relations and field attributes. CJ CSV to JSON Schema Infer JSON Schema from CSV data with column type detection, patterns, and validation rules. TC Tailwind Component Generator Generate common UI components (buttons, cards, navbars, modals) with Tailwind CSS and copy the code. EG .editorconfig Generator Build .editorconfig files with per-language settings for indent style, charset, and line endings. PJ package.json Generator Build package.json files with scripts, dependencies, metadata, and best-practice defaults. TJ tsconfig.json Generator Build TypeScript configuration with interactive compiler options, path aliases, and project references. EC ESLint Config Generator Build ESLint configuration files with rule selection, plugin setup, and environment targeting. WC Webpack Config Generator Build webpack.config.js visually with loaders, plugins, optimization, and dev server settings. VC Vite Config Generator Build vite.config.ts with framework presets, plugin setup, build options, and proxy configuration. LF License File Generator Generate LICENSE files from templates (MIT, Apache 2.0, GPL, BSD) with project and author details. CP CI Pipeline Config Generator Generate CI/CD configs for GitLab CI, CircleCI, Jenkins, and Travis CI with template stages. KY Kubernetes YAML Generator Build Kubernetes manifests for Deployments, Services, ConfigMaps, and Ingress resources visually. MG Makefile Generator Build Makefiles with targets, dependencies, and variables for build automation workflows. CT CSS Transition Generator Configure CSS transitions with property, duration, timing function, and delay with live hover preview. CB CSS Backdrop Filter Generator Design backdrop-filter effects for glass-like UI elements with blur, saturation, and contrast controls. CM CSS Mask Image Generator Create CSS mask effects with gradients, images, and SVG masks with live element preview. CC CSS Counter Style Generator Design custom list markers using @counter-style with symbol, system, and range configuration. CA CSS Aspect Ratio Calculator Calculate and preview CSS aspect-ratio values with common presets and responsive container sizing. CS CSS Scroll Snap Builder Configure CSS scroll snap with snap type, alignment, and padding with scrollable live preview. CC CSS Container Query Playground Experiment with CSS container queries by resizing containers and seeing responsive style changes. CS CSS Subgrid Playground Experiment with CSS subgrid to align nested grid items with parent tracks using visual controls. CL CSS Logical Properties Converter Convert physical CSS properties (margin-left) to logical ones (margin-inline-start) for RTL support. CO CSS Outline Generator Configure outline, outline-offset, and focus-visible styles with accessibility-friendly defaults. CS CSS Shape Outside Generator Create float wrapping shapes with circle, ellipse, polygon, and image-based shape-outside values. CC CSS Color Function Converter Convert between CSS color formats: hex, rgb, hsl, hwb, oklch, oklab, and color() with live swatch. CN CSS Nesting Converter Convert flat CSS to native CSS nesting syntax and vice versa with selector validation. AE AES Encryption Playground Encrypt and decrypt text with AES-GCM, AES-CBC, and other algorithms using the Web Crypto API. X5 X.509 Certificate Decoder Decode PEM-encoded X.509 certificates and display subject, issuer, validity, and extensions. HS HTML Sanitizer Tester Test HTML sanitization with DOMPurify and configurable allow lists for tags, attributes, and URLs. SQ SQL Query Builder Build SQL SELECT queries visually with table joins, WHERE clauses, GROUP BY, and ORDER BY. SE SQL EXPLAIN Visualizer Paste EXPLAIN output from PostgreSQL or MySQL and see a visual query plan with cost estimates. MQ MongoDB Query Builder Build MongoDB find, aggregate, and update queries visually with operator selection and JSON preview. RC Redis Command Builder Build Redis commands visually with data structure selection, arguments, and command documentation. DI Database Index Advisor Analyze SQL queries and suggest optimal database indexes based on WHERE, JOIN, and ORDER BY clauses. SM SQL Migration Generator Generate migration scripts (up/down) for schema changes with ALTER TABLE, ADD COLUMN, and rollback. FD Fake Data Generator Generate realistic fake data (names, emails, addresses, dates) in JSON, CSV, or SQL format. SD SQL Dialect Converter Convert SQL between dialects: PostgreSQL, MySQL, SQLite, SQL Server, and Oracle syntax. PS Prisma Schema Editor Edit Prisma schema files with syntax highlighting, model validation, and relation visualization. DS Drizzle Schema Editor Design Drizzle ORM schemas with table definitions, columns, indexes, and relation setup. IE IndexedDB Explorer Browse, query, and manage IndexedDB databases in your browser with table views and CRUD operations. DC Database Connection String Builder Build connection strings for PostgreSQL, MySQL, MongoDB, Redis, and SQL Server with parameter options. ST SQL Table Designer Design database tables visually with column types, constraints, defaults, and generate CREATE TABLE SQL. GB Git Branch Name Generator Generate standardized branch names from issue titles with feature/fix/chore prefixes and slug formatting. GC Git Conflict Resolver Paste git merge conflict markers and resolve conflicts with a side-by-side visual editor. GL Git Log Visualizer Paste git log output and see a visual branch graph with commit history and merge points. GH Git Hooks Generator Generate git hook scripts (pre-commit, pre-push, commit-msg) with lint, test, and format checks. PD PR Description Generator Build pull request descriptions with templates for summary, changes, testing, and screenshots. RN Release Notes Generator Build release notes from commit messages with categorization, contributor listing, and formatting. MS Monorepo Structure Visualizer Paste a monorepo directory tree and visualize workspace packages, dependencies, and shared modules. GA Git Alias Builder Build and manage custom Git aliases with command preview, documentation, and .gitconfig export. JP JavaScript Profiler Profile JavaScript code execution time with function-level timing, call count, and performance flame chart. ML Memory Leak Detector Run JavaScript code and track object allocation, detached DOM nodes, and closure references for leaks. CL Console.log Formatter Build styled console.log statements with CSS formatting, tables, groups, and color-coded output. ST Stack Trace Parser Parse stack traces from JavaScript, Python, Java, and Go with clickable file paths and line highlighting. NT Network Throttle Simulator Simulate network conditions (3G, 4G, slow Wi-Fi) and see how file sizes affect load times. EC Error Code Lookup Search common error codes across platforms (HTTP, errno, Windows, Node.js) with descriptions and fixes. PO Performance Observer Playground Use the Performance Observer API to monitor paint timing, layout shifts, and long tasks in real time. CE Crontab Expression Editor Build and validate cron expressions with a visual editor showing next 10 execution times. DI Docker Image Size Analyzer Paste a Dockerfile and estimate layer sizes with optimization tips for smaller image builds.