Preview HTML email templates with inbox rendering simulation for desktop and mobile email clients.
Email HTML Preview turns pasted email markup into an inbox-style visual check at desktop and mobile sizes. It helps you inspect content hierarchy, spacing, colors, images, tables, and responsive changes without sending a message. The preview is useful for catching obvious layout problems before a campaign or transactional template is connected to a delivery system. The common surprise is that a simulated view cannot guarantee identical rendering in Gmail, Outlook, Apple Mail, or other email clients.
A concrete input and expected output from the current implementation.
Input
<h1 style="color: #0057b8;">Order ready</h1> <p>Your package is ready for pickup.</p>
Expected output
The preview displays a blue heading reading "Order ready" followed by the paragraph "Your package is ready for pickup."
The h1 element supplies the heading and its inline color. The p element appears as a separate paragraph beneath it.
Paste the HTML body or template into the input. The tool interprets its elements and styles, then presents the resulting email content inside an inbox-like preview. Inline declarations such as colors, spacing, and typography affect the displayed result when the preview supports those HTML and CSS features. Editing the source lets you visually check revisions.
Desktop and mobile simulations show the template within differently sized viewing contexts. Comparing them can reveal wrapping, cramped columns, oversized images, small text, or calls to action that become awkward at narrower widths. The modes represent layout checks, not captures produced by every named email application, operating system, or client version.
No. It provides an inbox rendering simulation for visual inspection, but email clients have different layout engines, CSS support, security rules, and version-specific behavior. Use the result to find clear problems and compare form factors. Exact compatibility still requires sending test messages to the particular clients and versions that matter to your audience.
Yes, for an initial comparison between desktop and mobile layouts. It can show whether content wraps or reorganizes as expected in the simulated views. It cannot certify that media queries or other responsive rules will work in every inbox, because clients may ignore, modify, or remove HTML and CSS features.
The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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