Are my files uploaded?

No. This tool runs entirely in your browser tab. Files are read from your disk into memory and the result is generated locally.

Is it free? Are there limits or watermarks?

Free and open source (MIT). There are no file-size caps, daily quotas, accounts or watermarks.

Does it work offline?

Yes, once the page (and any engine it needs) has loaded, it keeps working without a connection thanks to the service worker cache.

Home / Image / GIF Speed, Reverse & Cut

GIF Speed, Reverse & Cut

Speed up or slow down an animation, play it backwards or as a boomerang, and cut a frame range.

Free, no uploads, no sign-up. Runs 100% in your browser.

How GIF Speed, Reverse & Cut works

Animations are decoded into full frames in your browser (GIF with gifuct-js, APNG with UPNG.js, WebP frames with the browser decoder), edited, then written back out. GIF is encoded with gifenc plus our own frame optimiser; WebP, MP4 and WebM go through ffmpeg.wasm. Viewers cannot show frames shorter than 20 ms, so very fast speeds merge frames instead of producing a GIF that plays slower than expected.

Input: GIF, APNG, WEBP, AVIF. Output: GIF, APNG, WEBP, MP4, WEBM.

How to use GIF Speed, Reverse & Cut

Drop one or more images onto GIF Speed, Reverse & Cut.
Tune the options. The before/after preview updates live.
Process the batch.
Download a single image, or everything as a ZIP.

Tips

Most image tools accept many files at once.
WebP and AVIF give much smaller files than JPG at the same visual quality.
Set a default image quality in Settings. Tools that do not choose their own quality use it.

GIF Speed, Reverse & Cut FAQ

Are my files uploaded?: No. This tool runs entirely in your browser tab. Files are read from your disk into memory and the result is generated locally.
Is it free? Are there limits or watermarks?: Free and open source (MIT). There are no file-size caps, daily quotas, accounts or watermarks.
Does it work offline?: Yes, once the page (and any engine it needs) has loaded, it keeps working without a connection thanks to the service worker cache.

Related tools

GIF Frame Editor: Reorder, delete, duplicate and retime frames, set loop count, add frames, then save as GIF, APNG, WebP or video.
Reverse Video: Play a video backwards with reversed sound, or make a forward-and-back boomerang loop.
Video Speed: Speed up or slow down a video from 0.25× to 4×.
Image Compressor: Shrink images in bulk with quality and width controls and live savings.