GIF Speed Changer

What GIF Speed Changer does

GIF Speed Changer makes an animated GIF play faster or slower by changing how long each frame stays on screen. The pictures are not touched, and a GIF with uneven timing keeps its rhythm, because every delay is scaled by the same amount.

It can also give every frame one fixed delay, which evens out a GIF whose timing jumps around.

How to use it

1. Select Choose GIF and pick a .gif, or drop one on the file row.
2. Under Mode, keep Change the speed and pick a Speed from 0.25x to 4x, or Custom for any value from 0.1x to 10x.
3. Or pick Same delay for every frame and type the delay in milliseconds.
4. Set Loop. The preview plays at the new speed, and the line under it shows the new length.
5. Select Download GIF.

Formats and limits

• Input: one GIF file.
• Output: a GIF named after the original with the speed added, such as cat-2x.gif or cat-0.5x.gif, or with -retimed for one fixed delay.
• Speeds start from the delays browsers show. A frame stored with a delay of 0 or 10 ms plays for 100 ms in browsers, so it counts as 100 ms.
• Browsers show any delay of 10 ms or less as 100 ms, so the fastest a frame can play is 20 ms. When a speed would go under that, frames are dropped and their time goes to the frame before them, and a note above the preview says how many.
• Delays are stored in steps of 10 ms. The tool rounds the running total rather than each frame, so the overall length stays close to exact.
• Same delay for every frame takes 20 ms or more.

Settings explained

Mode

Change the speed scales the delays you already have. Same delay for every frame replaces them all with one value.

Speed

0.25x, 0.5x, and 0.75x slow the GIF down; 1.25x to 4x speed it up. Custom opens a slider from 0.1x to 10x in steps of 0.05.

Delay for every frame (ms)

How long each frame stays on screen in Same delay mode, rounded to 10 ms.

Loop

Forever, Once, or a set number of plays. It starts at the setting stored in your GIF.

Privacy

The new timing is worked out in this tab, and the GIF is encoded in a Web Worker, a background thread of the same page. Nothing is uploaded, and the file is only written when you select Download GIF.

FAQ

Why were frames dropped?

At the speed you picked, some frames would last less than 20 ms. Browsers would hold those for 100 ms, which makes the GIF slower, so the tool drops them and keeps the length right instead.

Why does 4x not look four times faster?

If the frames are already short, 4x runs into the 20 ms limit. The GIF still finishes in about a quarter of the time, with fewer frames.

Will the file get smaller?

Dropping frames makes it smaller. Otherwise the frames stay the same, but the GIF is encoded again with its own palettes, so the size can change a little either way.

Can I slow down just one part?

Use GIF Frame Editor, where every frame has its own delay.

Related tools

• GIF Frame Editor - set the delay of each frame by hand.
• GIF Inspector - check every frame's delay first.
• GIF Reverser - play the GIF backwards or as a boomerang.
• GIF Optimizer - lower the frame rate to make the file smaller.
• Video Speed Changer - change the speed of a video instead.