Compress GIF

Three knobs: scale (shrink dimensions), quality (palette colour count — fewer colours means smaller file), and frame skipping (drop every 2nd or 3rd frame and combine their delays). Each one trades a bit of fidelity for a smaller file; combining all three usually cuts size by 60–90% with the original still recognisable.

No. The tool decodes and re-encodes the GIF entirely in your browser using WebWorkers and the HTML canvas API. Your file never leaves your device. This matters if the GIF is private, internal, or watermarked work-in-progress.

75% is a good default — barely noticeable in most cases and shaves ~40% off the file size. 50% halves both width and height (about 75% smaller in bytes) and is suitable for chat reactions and previews. 25% is aggressive — use it for tiny thumbnails or when you need the GIF under a strict upload limit.

Internally it's the colour-quantisation aggression that gif.js applies — High keeps a richer 256-colour palette per frame, Medium balances size vs fidelity, Low collapses to fewer colours and shows more banding. For photographic GIFs (e.g. video clips), Medium is the safest default. For cartoon-style GIFs with flat colours, Low can compress hard without visible loss.

Most animated GIFs run at 10-15 frames per second and look fine at half that. Dropping every 2nd frame halves the frame count and roughly halves the size — the animation still reads correctly but stutters a little. Dropping every 3rd frame is more aggressive and works best on long, simple animations.

The tool combines the delays of skipped frames into the next kept frame, so the total animation duration stays the same. The animation just plays back in fewer steps. For 30-frame loops, dropping to every 2nd keeps the loop at the same speed with 15 frames; dropping to every 3rd keeps it with 10 frames.

Yes, occasionally — especially if the original was already heavily optimised by something like gifsicle, or if you turn quality up to High while keeping 100% scale and all frames. The Saved row shows positive (savings) or negative (grew) so you can tell at a glance. If it grew, increase scale-down, lower quality, or drop frames.

Up to about 50 MB. Larger GIFs decode and encode slowly in the browser; if it stalls, your computer probably ran out of memory — try a smaller source.

Yes, the compositing keeps transparency where the source had it. Note that GIF only supports binary transparency (a pixel is either fully transparent or fully opaque), not partial alpha — so subtle transparency edges may look harsher in the compressed file, but that's a GIF limitation, not the tool.

Looping is preserved automatically. The encoder writes the loop count from the encoder's default (infinite), which matches the typical web behaviour of animated GIFs.

Yes, completely free. Runs entirely in your browser. No signup, no ads on the result, no watermark.