GIF Dissector
Drop an animated GIF and extract every frame with its real metadata - delay, disposal method, dimensions, offsets - rendered one by one. For pulling a still out of an animation, or working out what timings a GIF actually contains when it plays wrong somewhere. Decoded in your browser with no third-party CDN code; nothing is uploaded. Imported Claude artifact. Source: https://github.com/simonw/tools (gif-dissector.html, Apache-2.0).
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System prompt (SKILL.md)
---
name: gif-dissector
description: Drop an animated GIF and pull out every frame, with its delay, disposal method and dimensions.
metadata:
tags:
- artifact-import
- media
source_url: https://tools.simonwillison.net/gif-dissector
github_repo_url: https://github.com/simonw/tools
---
# GIF Dissector
An imported Claude artifact. Drop in an animated GIF and it decodes the file
frame by frame, showing each rendered image alongside its metadata - the delay
before the next frame, the disposal method, dimensions and offsets - so you can
see how the animation is actually assembled rather than just watching it run.
Useful when a GIF plays too fast or too slow somewhere and you need to know
what timings are really in the file, when you want a specific still out of an
animation, or when you are debugging a GIF encoder's output.
Decoding uses gifuct-js, served from this app rather than a CDN, so the page
loads no third-party code. The file is parsed in the browser: nothing is
uploaded, no model is called, and nothing is metered.
Release files (files)
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