ALL IMAGE TOOLS56
Resize GIF
Resize a GIF Online — Keeps the Animation
Scales an animated GIF down and re-encodes every frame, keeping the frame timing exactly as it was.
Nothing is enforced, but every frame is held decoded in memory at once, so a long GIF at full size can exhaust the tab before it finishes.
About Resize GIF
Most tools that claim to resize a GIF quietly hand back a still, because the ordinary way a browser reads an image keeps only the first frame. This one decodes the whole animation first, scales every frame, and writes them back with the delays the original stored. Scaling down is the useful direction: it is the single most effective way to make a GIF smaller, because the file cost is roughly the pixel count multiplied by the number of frames. Halving the dimensions removes three quarters of the pixels in every frame at once, which usually does far more than any amount of palette tuning. Everything happens in this tab. The animation is decoded frame by frame, worked on, and written back out with gifenc, which this site already carries for its video-to-GIF tool — so nothing is uploaded and no new engine is downloaded. One thing is worth knowing before you start: re-encoding a GIF is not lossless. A GIF can hold at most 256 colours per frame, and rebuilding the file means choosing that palette again. Flat colour, line art and text come through cleanly; fine gradients and photographic frames can band slightly. The original file on your disk is untouched either way.
Questions
Will this turn my animation into a still?
No, and that is the main reason this page exists. The ordinary way a browser reads an image keeps only the first frame, which is why so many tools that claim to resize a GIF quietly hand back a single picture. This decodes the whole animation first, scales every frame, and writes them back with the delays the original stored.
How much smaller will the file get?
It depends on the picture, but scaling down is by far the most effective lever available. A GIF's size is roughly its pixel count multiplied by its frame count, so halving the dimensions removes three quarters of the pixels in every frame at once — that usually does more than any amount of palette tuning. The page shows the resulting file size so you can judge it against the original rather than take a promise.
Why can I only scale down, not up?
Because scaling up cannot add detail that is not there. Enlarging a GIF gives you a bigger, softer version of the same picture and a considerably larger file, which is almost never what someone wants from a tool called 'resize'. If you genuinely need a larger canvas, that is a different job.
Does re-encoding lose quality?
Re-encoding a GIF is not lossless, and it is worth knowing why. A GIF holds at most 256 colours per frame, so rebuilding the file means choosing that palette again from the decoded pixels. Flat colour, line art, screenshots and text come through cleanly. Photographic frames and fine gradients can band slightly, because the second palette is not guaranteed to be the first one. Your original file is untouched either way, so you can always compare.
Is my GIF uploaded?
The animation is decoded frame by frame in your tab and written back with gifenc, which this site already carries for its video-to-GIF tool — so nothing is uploaded and no extra engine is downloaded. Two decoders are used depending on your browser: Chrome, Edge and Firefox have a built-in image decoder that returns frames directly, and Safari does not, so a small bundled JavaScript reader handles it there. Both produce the same frames; the difference is only in who does the work.
Is my file uploaded to a server?
No. Transmute processes everything locally in your browser using JavaScript and WebAssembly. Your files never leave your device — there is no server, no upload, no cloud processing.