When this tool is useful
Creating a GIF fallback for a modest animated WebP when the receiving application cannot play animated WebP but accepts GIF.
How local processing works
When ImageDecoder reports supported animated WebP frames, the browser decodes full RGBA canvases and durations, converts timing to GIF centiseconds, quantizes colors under the selected palette and dithering settings, and writes a GIF loop.
How to use it
- Prepare the source and limits: Keep an unchanged source and review the accepted format, dimensions, frame or page budget, and output choices. Creating a GIF fallback for a modest animated WebP when the receiving application cannot play animated WebP but accepts GIF.
- Process locally: Run the documented bounded operation in this browser and stop when the decoder reports an unsupported structure. When ImageDecoder reports supported animated WebP frames, the browser decodes full RGBA canvases and durations, converts timing to GIF centiseconds, quantizes colors under the selected palette and dithering settings, and writes a GIF loop.
- Download and verify: Compare several loops of the WebP and GIF side by side in target browsers, confirm frame count, duration and loop behavior, inspect gradients and translucent edges, and verify the GIF's actual byte size before replacing any delivery asset.
Important limitations
Animated WebP input works only where browser ImageDecoder exposes the required codec and frames; there is no universal fallback. GIF has at most 256 palette entries per color table, binary transparency and centisecond delays, so color, alpha, timing, file size and compression efficiency can be substantially worse. Conversion is lossy and does not preserve WebP metadata.
Verify the downloaded result
Compare several loops of the WebP and GIF side by side in target browsers, confirm frame count, duration and loop behavior, inspect gradients and translucent edges, and verify the GIF's actual byte size before replacing any delivery asset.
Private by design
Your files stay in this browser. The tool does not upload the source or output to our servers.
Questions and answers
When is this workflow useful?
Creating a GIF fallback for a modest animated WebP when the receiving application cannot play animated WebP but accepts GIF.
What does local processing do?
When ImageDecoder reports supported animated WebP frames, the browser decodes full RGBA canvases and durations, converts timing to GIF centiseconds, quantizes colors under the selected palette and dithering settings, and writes a GIF loop.
Which format limits matter?
Animated WebP input works only where browser ImageDecoder exposes the required codec and frames; there is no universal fallback. GIF has at most 256 palette entries per color table, binary transparency and centisecond delays, so color, alpha, timing, file size and compression efficiency can be substantially worse. Conversion is lossy and does not preserve WebP metadata.
How should I verify the download?
Compare several loops of the WebP and GIF side by side in target browsers, confirm frame count, duration and loop behavior, inspect gradients and translucent edges, and verify the GIF's actual byte size before replacing any delivery asset.