Upload a design screenshot and annotate it with dimensions, spacing, colors, and font specs for developers.
Design Handoff Spec Generator uses an uploaded screenshot as the canvas for callouts covering element dimensions, gaps, colors, and typography. The marked-up reference helps a developer connect a visible feature with a concrete value instead of interpreting an unlabeled image. The common mistake is treating those annotations as recovered source styles. A screenshot records one rendered state, so it cannot establish responsive rules, hidden states, semantic tokens, or whether an apparent distance came from margin, padding, gap, or alignment. The image and annotations remain in the browser and are not uploaded.
Start with a screenshot at the resolution you want to document. Place each annotation beside the feature it describes and label it with the relevant unit or value, such as a component width, the gap between two edges, a color notation, or a font specification. Keep callout lines unambiguous when elements are close together.
The screenshot remains the visual evidence, while each annotation supplies information that pixels alone do not communicate clearly. Dimension and spacing notes should identify their endpoints. Color notes should point to a specific fill, border, or text sample. Typography notes are most useful when they distinguish family, size, weight, and line height instead of using one catch-all label.
No. It documents visible measurements and chosen annotations, but it cannot recover the original DOM structure, selectors, layout rules, design tokens, or responsive behavior. Developers can use the result as an implementation reference, while still deciding how those values belong in components and stylesheets.
Not automatically. Screenshot pixels and CSS pixels can differ because of device pixel ratio, browser zoom, capture scaling, or later image resizing. Confirm the screenshot's capture context before treating a measured distance as a CSS value. When the original design value is known, annotate that value directly.
The 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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