Optimize a GIF Online

Optimize a GIF: how it works

Reduces a GIF's file size with three levers: colour quality (how finely each frame's 256-colour palette is built), frame skipping (keep every Nth frame), and width. You combine them until the GIF fits your size budget while staying animated.

Levers

Colour quality · frame skip · width

Colour quality

1 (best) – 30 (smallest), default 10

Frame skip

Keep every Nth frame (e.g. 1/2)

Biggest saving

Width, then frame count

Keeps

Animation and loop

What to know about the GIF format here

GIFs are heavy because every frame is a full image with its own palette; the way to make one smaller is to cut what each frame costs — fewer pixels, fewer frames, or a coarser palette — there is no lossy slider like JPEG quality.

Tips for the best result

• Width usually saves the most, then frame count, then colours — start by lowering the width, then drop to every other frame, then coarsen the palette.
• The colour-quality control maps to gif.js quality (1 is the sharpest and largest, up to 30 is the smallest and roughest, default 10); raising the number trades fidelity for size.
• Frame skipping keeps every Nth frame (e.g. 1/2 keeps half), which roughly halves the frame data but makes fast motion look choppier — best on slow or subtle loops.
• Animated GIFs over a few megabytes are often rejected or auto-converted by chat apps and forums, so optimizing to fit a platform's limit is frequently the real goal.

When to use this

Reach for this when a GIF is too large to upload, loads slowly, or bumps a size limit, and you are willing to trade a little smoothness or colour fidelity for a much smaller file.

How GIF files behave

• A GIF stores up to 256 colours per frame from a palette it picks for that frame, so flat graphics, logos, line art, and screen recordings reproduce cleanly, while photographic gradients and skin tones can band or dither.
• GIF compression (LZW) is lossless per frame — it never adds JPEG-style blocky artefacts — but because every frame is essentially a full image, the file grows quickly with more frames, more pixels, and more colours.
• Animation timing is stored as a per-frame delay in hundredths of a second, and looping is set by a small repeat marker (the Netscape extension), which is why a GIF can loop forever on its own with no player controls.
• A GIF has no audio track and no real alpha blending — only a single fully-transparent colour — so it is built for short, silent, looping motion rather than full video; a muted MP4 or WebM is far smaller for anything longer than a few seconds.