ALL IMAGE TOOLS56
GIF Speed Changer
Change the Speed of a GIF — Faster or Slower
Rescales how long each frame is shown. No frames are added or thrown away, so nothing gets choppier than it started.
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 GIF Speed Changer
Changing a GIF's speed means changing how long each frame is displayed, not adding or removing frames — and that distinction matters, because a tool that speeds things up by dropping frames makes the result visibly choppier while claiming to have done what you asked. Here every frame survives and only its delay is rescaled. There is a hard floor, and the page shows it rather than letting you drag past it into nothing. A GIF stores each frame's delay in hundredths of a second, so twenty milliseconds a frame is about as fast as the format can honestly describe; beyond that the file cannot say 'faster' and different browsers substitute their own timing anyway. Slowing down has no such limit. 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
Does speeding it up drop frames?
No. Changing speed here means rescaling how long each frame is displayed, not adding or removing frames. That distinction matters: a tool that speeds things up by dropping frames makes the result visibly choppier while appearing to do what you asked. Every frame in your file survives, at every speed setting.
Why does it stop getting faster past a point?
Because the format runs out of room to describe it. A GIF stores each frame's delay in hundredths of a second, so around twenty milliseconds per frame is as fast as the file can honestly say — and browsers substitute their own timing for anything shorter, which means different people would see different speeds. The page states the floor rather than letting you drag a slider that has quietly stopped doing anything. Slowing down has no such limit.
Can I set a specific frame rate instead?
Not directly. GIF has no frame rate — it has a delay per frame, and those delays do not have to be equal. Many real GIFs hold one frame much longer than the rest, and imposing a single frame rate would flatten that deliberate pause. Working in percentages keeps the original rhythm and just stretches or compresses it.
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.