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Frame diffing. Palette reduction. Lossless animation optimisation. Process animated GIFs in your browser or in bulk via the desktop app - no uploads, no waiting.
Drag & drop or click to browse (GIF)
Animated GIFs are notoriously large.
A 5-second UI demo or social reaction GIF can easily be 8-15MB - far too large for email, Slack, or web embedding.
FastCompressor applies frame diffing (removing redundant data between frames), colour palette optimisation (finding the most efficient 256-colour representation), and dithering control to produce the smallest possible GIF while keeping the animation fluid.
GIF animation stores every frame as a full image.
Frame diffing only stores what changes between frames - dramatically reducing file size for animations with static backgrounds or slow motion.
GIF is limited to 256 colours per frame.
Which 256 colours you choose matters enormously.
FastCompressor uses perceptual colour selection - the 256 most important colours for how your eye perceives that specific image.
Dithering blends colours to simulate more than 256 shades.
FastCompressor gives you control over dithering method - from Floyd-Steinberg for smooth gradients to no dithering for clean flat-colour animations.
Marketing teams and developers rarely compress one GIF.
FastCompressor's desktop Pro app batch-compresses entire GIF libraries - email campaigns, documentation, social media assets - in seconds.
Built for professionals who need speed, privacy, and quality.
Learn how it works
Why GIFs are so large - and how FastCompressor fixes it
An animated GIF stores every frame as a complete image. A 3-second GIF at 24fps contains 72 individual frames. Even if most of the image doesn't change between frames, a naive encoder stores the full pixel data for each one. That's why a short screen recording saved as GIF is routinely 15-25 MB.
FastCompressor uses two techniques to fix this:
Frame diffing - Instead of storing each full frame, the encoder only stores the pixels that changed from the previous frame. A cursor moving across a static background stores only the cursor's movement, not the entire frame. This alone reduces GIF file size by 30-60% for most animations.
Palette quantisation - Each GIF frame uses a palette of up to 256 colours. Most GIFs only need 64-128 colours to look identical. FastCompressor analyses each frame and reduces the palette to the minimum required, without introducing visible colour banding.
The result: a GIF that loops identically to the original, at a fraction of the file size.
For content creators: GIFs for Slack, Notion, and social media have file size limits. Slack's GIF limit is 100 MB - but large GIFs slow down channels and chats. Compress to under 5 MB for smooth performance.
For developers: Consider converting GIFs to WebP animations or MP4 for web use - these formats are 5-10x smaller than equivalent GIFs. FastCompressor's desktop app handles GIF-to-WebP conversion in the same batch operation.
See why teams choose FastCompressor
| Feature | FastCompressor | Typical Online Tool |
|---|---|---|
| Frame diffing | Yes | No |
| Palette optimisation | Perceptual (best) | Basic |
| Dithering control | Full control | Fixed |
| Batch GIF support | Unlimited (Pro desktop) | 1-5 files |
| Offline processing | Yes | No |
| Price | $19 once | $5-79/month |
Use our free browser tools for small, instant jobs. For unlimited batch processing and total privacy, we recommend the desktop app.
MP4, MOV & WebM size reduction. High efficiency encoding for web & social.
Smart lossy reduction.
Keep alpha transparency.
Next-gen performance.
Frame optimization.
Archival lossless.
Unlimited Power
Remove backgrounds.
Smart dimensions.
Fix orientation.
Meme & caption.
Protect your brand.
Convert vectors.
Merge to document.
Create animations.
Frame diffing · Palette optimisation · Batch folders · 30-day guarantee