Start with the file-size limit shown by your destination. A target is a ceiling, not a request to pad the output to exactly that many bytes. Some GIFs need smaller dimensions or fewer frames to reach a small target.
Popular File-Size Targets
| Target | Typical use case | Quick link |
|---|---|---|
| 256 KB | Discord emoji, forum avatar | 256 KB preset → |
| 1 MB | A 1MB upload requirement or image budget | 1 MB preset → |
| 8 MB | An 8MB upload requirement or image budget | 8 MB preset → |
| 10 MB | GitHub issue/comment images; check Tumblr requirements | 10 MB preset → |
| Custom | Any KB or MB value | Home page → |
How Target-Size Compression Works
Target-size compression encodes candidates and measures their actual byte size. It can reduce colors, dimensions or frame count, depending on the settings you allow:
- First pass — CompressGIF analyses the frame count, palette, and dimensions of your input and picks an initial lossy level.
- Encode & measure — The GIF is re-encoded and the output size is checked against your target.
- Adjust — The engine searches stronger compression settings and, when allowed, smaller dimensions or fewer frames.
- Repeat — The engine returns a candidate and reports if the target was missed. It does not guarantee an exact byte count.
This happens entirely in your browser via a WebAssembly build of the gifsicle engine. There is no server queue and no upload.
Step-by-Step Instructions
1. Pick a preset or set a custom target
Click one of the preset links in the table above, or open the home page compressor select a file, choose Target Size and enter a KB or MB value. This tool counts 1 KB as 1,024 bytes and 1 MB as 1,048,576 bytes. A service may use decimal units; the Discord emoji preset targets 250,000 bytes for headroom.
2. Upload your GIF
Drag your file onto the upload area. You will immediately see the original file size and animation preview.
3. Compress
Click Compress. The status shows the current processing stage. When it finishes you will see:
- The output file size and whether the target was reached.
- The compression ratio and bytes saved.
- A side-by-side (or toggle) animation comparison.
4. If the target cannot be reached
Some GIFs are already near-optimal or have too many frames to fit a very small target. When the compressor reports the target was not met, you have two options:
- Reduce dimensions — use the Resize tool to shrink the width and height, then compress again.
- Enable frame subsampling — drop every other frame. The tool automatically extends each remaining frame's delay so the animation speed stays the same.
When GIF Is the Wrong Format
If your animation is longer than ~10 seconds or contains full-motion video content, a GIF will always be large. Consider these alternatives:
- WebM / MP4 — video codecs compress motion far more efficiently. Most chat platforms and browsers support embedded video.
- APNG — animated PNG supports full-colour and transparency. Supported in all modern browsers but file sizes are comparable to or larger than GIF.
- Animated WebP / AVIF — newer formats with much better compression, but not universally supported as custom emojis or avatars.
If you have a video and must use GIF (e.g. for a custom emoji), you can convert a short clip to GIF and then compress to the required size.
Set your target and compress now