How to use GIF Compressor
Shrink animated GIFs dramatically — fit under any platform's limit, keep every color and frame you can, and see exactly what changed before you download.
A short guide to getting good results, plus answers to the questions people ask most.
How to use it
- 1
Drop the GIF and read the first result
Quick mode compresses at a sensible default the moment you press Compress: smart delta plus light lossy. The result line tells you what happened — how many pixels the delta kept, whether it merged still frames, and whether gifsicle alone was smaller.
- 2
Use the wipe and the difference map before you touch anything
Drag the line across the picture, pause and step frames, then switch to Diff: black means untouched, brighter means the pixel moved. If the map is dark everywhere but the moving subject, you have headroom to go further.
- 3
Have a limit? Let the tool search
Choose a platform under Fit under or type a size. Lossy is spent first, then colors, then scale, then frame rate — the last two only if you allow them — and each rung is a real encode. Open the attempts list to see what it tried.
- 4
Lower Quality before you cut colors
The Quality slider is lossy LZW: invisible on most sources up to the middle of its range and far cheaper than a smaller palette. Colors below 256 rebuild one shared palette for the whole loop and cost gradients first.
- 5
Raise the motion threshold for noisy video, lower it for clean art
In Advanced, Smart delta's threshold decides how far a pixel must move before it is repainted. Around 20 is invisible on video; 0 keeps every pixel exact for pixel art and screen recordings; above 50 slow gradients can lag a frame. Temporal denoise removes one-frame flicker on top.
- 6
Resize and drop frames last, and only to the size it will show at
Halving the dimensions quarters the pixels; halving the frame rate halves the frames at exact wall-clock length. Both are visible, so they come after the invisible levers — and the before/after shows a downscaled result stretched back for a fair comparison.
About this tool
The GIF Compressor runs two engines in your browser. The first is gifsicle, the optimizer behind the well-known web tools, with lossy LZW, palette reduction, scaling and frame dropping. The second is ours: a smart temporal delta that compares every frame with what is already on screen and repaints only the pixels that actually moved — the trick video-derived GIFs need, because their sensor and codec noise defeats ordinary frame optimization. Each frame keeps its own palette, so a loop can hold thousands of colors; on a still-background clip the file can come out several times smaller at the same quality, and the tool measures both engines and ships whichever is smaller.
Everything is measured, never estimated: the output size, every attempt of a fit-under search, and the before/after you inspect — source and result play on one clock with a wipe, a side-by-side, an amplified difference map and actual-pixel zoom. Compression happens on your device, so there is no upload wait, no server file-size cap and no privacy question.
Features
Smart delta
A perceptual temporal pass repaints only the pixels that moved. Still backgrounds under video noise compress 3–5× further than lossy alone.
Fit under a limit
Pick Discord, X, GitHub, Giphy, Slack or a custom size. The tool searches lossy, colors, scale and frame rate on measured bytes and shows every attempt.
Synced before/after
Source and result on one clock: wipe, side-by-side, ×6 difference map, pause, step frames, zoom to actual pixels.
No upload, no cap
Local processing handles GIFs far larger than online compressors accept, and your files never leave the device.
Honest progress
Decoding, the delta pass and each search attempt are measured; the gifsicle stage is a labelled estimate that learns your machine.
Full editor
Trim, adjust color, choose dithering and palette method, set frame rate, scale and loop count, and export a PNG sequence.
Frequently asked questions
How do I make a GIF smaller without ruining it?
Start with the default (smart delta plus light lossy) and look at the difference map. Then raise lossy before reducing colors, and only then resize or drop frames. Every step shows the measured size and the exact pixels that changed.
What is smart delta?
A pass that compares each frame with what is already on screen and repaints only pixels that moved further than a threshold, with one palette per frame built from those pixels. It is the idea behind gifski's encoder, run in your browser ahead of gifsicle. On full-motion sources it is skipped automatically — the tool measures both and keeps the smaller.
Can it get my GIF under Discord's, X's or GitHub's limit?
Yes: choose the platform under Fit under. The search is on real bytes, so the result is always at or under the limit; if even the last rung is over, it says so and gives you the smallest it produced. Limits were checked in September 2026 and can change.
Does it keep transparency?
Yes. Transparent backgrounds and stickers go through the same pass; a pixel that becomes see-through is handled with a background clear, and the before/after shows alpha exactly.
Is there a file size limit?
No server limit — compression runs on your device. Very large frames (over about 16 megapixels) skip the delta pass and go straight to gifsicle.
Are my GIFs uploaded?
No. Everything runs locally in your browser. Saving to a ProDesigner account is optional and explicit.
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