Animated emoji
335.3 KB → 84.5 KB (−75%)
256×256 → 128×128 px · 36 frames · 3.6 s
Reference settings: 128 colors · lossy strength 60
Measured:
Compare animations
SLACK EMOJI · UNDER 128 KB · UP TO 50 FRAMES
GIF Compressor for Slack Emojis
Fit your GIF within 128×128 pixels and compress below 128 KB for Slack custom animated emojis. Zero server uploads.
Slack Emoji Preset
Targets 128 KB, fits within 128×128 pixels and keeps at most 50 frames (Slack's GIF emoji limit). Total playback time is kept.
< 128 KB · 128px · ≤ 50 frames
Drag and drop your GIF here, or click to browse
Supports .gif files up to 200MB. Everything is processed in your browser.
GIF
sample.gif
-- KB-- x -- px-- frames-- s
Output size
Enter a width or height between 1 and 4096 px.
Crop area
Drag on the preview to select the area to keep, or type the values below.
The crop area must fit inside the GIF.
(= 131,072 bytes)
Enter a target between 1 KB and 200 MB.
Advanced Compression Settings
80
Higher values create more compression noise (recommended: 30 - 80).
Initializing compression engine...
Settings changed. Compress again to update this result.
The compressed file would be larger or unchanged. Original file returned.
Compression Result-0%
Completed in 0.0s
Applied:
Original0 KB
Compressed0 KB
Try a sample GIF
Original demo animations, measured with Gifsicle. These are examples, not typical savings. Your settings and file will change the result.
The sample opens in the tool above. Press Compress to run your current settings.
SPECIFICATION
Slack Custom Emoji Guidelines
Based on the Slack Help Center article on adding custom emoji.
Slack Emoji Limit< 128 KB · ≤ 50 FRAMES
Keep It Under 128 KB and 50 Frames
Slack says square images under 128 KB work best, and GIFs can include up to 50 frames. This preset targets 128 KB, fits the GIF within 128×128 pixels, and cuts it to 50 frames or fewer while keeping the total playback time.
Tips for Creating Crisp Slack Emojis
- Use Square Images: Slack recommends square images. Crop non-square GIFs to 1:1 before compressing so the emoji fills its space.
- Preserve Transparency: Slack users frequently switch between light and dark modes. Ensure your GIF background is truly alpha-transparent.
- Keep Animations Short: Slack GIF emojis can have at most 50 frames. Short loops stay under that limit and under 128 KB without losing motion.
PRESET MATRIX
Explore Other Size Presets
Quickly jump to presets optimized for other platforms and strict size caps.
DISCORD EMOJI< 256 KB · 128×128
GIF Compressor for Discord
Auto-fit to 128×128 pixels and target <256 KB for Discord custom emojis.
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EMOJI & AVATAR< 256 KB · Target Size
Compress GIF to 256KB
Quickly shrink animations below 256KB for forum avatars, micro-interactions, and fast web pages.
Open 256KB Tool
EMAIL & WEB< 1 MB · Web & Email
Compress GIF to 1MB
Quickly shrink animations below 1MB for email attachments, Slack, and fast web pages.
Open 1MB Tool
SIZE CAP< 8 MB · 100% FPS
Compress GIF to 8MB
Downscale and optimize large GIFs under 8MB as a safe margin for forums, Reddit, and email.
Open 8MB Tool
GITHUB & TUMBLR< 10 MB · GitHub & Tumblr
Compress GIF to 10MB
Fit GIFs under the 10MB limit for GitHub issue and comment attachments or Tumblr uploads.
Open 10MB Tool