GIF Speed Changer — Frame-Exact Retiming

An online tool for changing the speed of an animated GIF. Set a multiplier, an exact duration or a target frame rate — the timing is recalculated frame by frame, so uneven animation keeps its rhythm. Processing runs in your browser through WebAssembly.

How to change GIF speed

1
Upload a GIF

Drop an animated GIF onto the upload zone or click to pick one. The tool parses the file and reports frame count, duration, frame rate and whether the timing inside is uniform.

2
Set the pace

Pick a multiplier with a preset or the slider, or switch to the Duration or Frames/s tab to state the result as a number. Right below the controls you see the speed you will actually get and how many frames will remain.

3
Adjust individual frames if needed

On the frame strip, click a frame and give it its own duration — to hold a final frame, for instance. Edited frames are marked, and one button clears them all.

4
Compare and download

The result plays next to the original, so you can judge the pace by eye, then press Download GIF.

Change the pace of a GIF without re-encoding its frames

Drop image here
GIF ·

What is in the file

Speed

GIF stores frame delay in whole hundredths of a second, so not every rate is expressible — browsers will not play faster than 50 frames per second.

Advanced
Shrinks the file when it has to be rebuilt. Does not affect the lossless path.

Before and after

Original
Original
Result
Result
Building.

The browser itself plays both animations, so you see exactly the pace your viewers will get, format limits included.

Frames and how long they hold

Kept Dropped Set by hand
hundredths of a second

Bar height is how long a frame stays on screen. Click a frame to give it its own duration — that holds one moment without touching the rest.

Features

Variable delays survive
A 24 fps GIF is stored as an alternation of 4 and 5 hundredths of a second, because that rate is not expressible as a whole number. Tools that write one delay across all frames erase that alternation and shift the real frame rate; here every frame is recalculated on its own.
Speed changes without re-encoding
Frame duration lives in a control block, not in the picture. When every frame is kept, the tool edits only those fields: the palette and the pixels stay as the original encoder wrote them and the file does not grow.
An honest ceiling instead of a silent swap
GIF cannot hold a delay shorter than two hundredths of a second, and browsers render anything shorter as a tenth of a second — so asking for more speed than the format allows usually produces an animation slower than the original. Here you see the speed you will actually get.
Frame thinning instead of hitting a wall
Once delays can no longer express the requested pace, the tool picks which frames to keep by sampling the source timeline: a frame that was held longer gets sampled more often, so the rhythm of the animation is preserved.
Per-frame durations
The strip shows each frame's hold time as a bar. Any frame can be given its own duration — hold one moment longer without touching the others.
Three ways to set the pace
A multiplier, an exact duration in seconds, or a target frame rate. The result plays next to the original, rendered by the browser itself.

Frequently asked questions

Why can a GIF not be sped up 10×?

The GIF format stores frame duration as a whole number of hundredths of a second, and browsers render anything below two hundredths as a tenth of a second. Past a certain point, therefore, speeding up is done by dropping frames rather than by shortening delays — the tool switches over by itself and shows how many frames go.

Does quality suffer?

When every frame is kept, no: only the duration fields are edited, while pixels and palette are copied unchanged. If reaching the requested pace requires dropping frames, the file is rebuilt — in that case the Method row reads Rebuild.

What does "variable timing" mean?

It means frames in the file have different durations. That is how encoders work around a format limit: 24 frames per second is 4.1667 hundredths per frame, and instead of a fraction the encoder alternates 4 and 5. Flattening such a file to one delay changes both the overall speed and the feel of the motion.

Can I set an exact duration?

Yes. On the Duration tab, enter the time you want in seconds and the multiplier is derived for you. The reverse mode is there too: state a target frame rate instead.

Why does slowing down look choppy?

Slowing down stretches the same frames; no new ones appear. Each one holds longer, which exposes the gaps between them. That is a property of the format rather than of the processing — the more frames the source has, the smoother a slowdown looks.

What happens to the loop count?

Endless looping is preserved by default. Under Advanced you can set a specific number of repeats or play once.

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Who is this tool for?
🎬 Video Creators ✨ Content Creators
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