How to Make a Slack Emoji GIF
Use this guide and GIF compressor for Slack to turn a normal GIF into a Slack-ready custom emoji: 128KB max, 128x128 square, and a short loop that is less likely to fail at upload.
Files stay in your browser. No upload. No watermark.
Make Slack Emoji GIFDrop a GIF here
or
Start with Slack's file rules
A Slack emoji GIF should be small enough for the 128KB limit, square at 128x128 or smaller, and simple enough to remain readable as an emoji.
Crop before compressing
Most failed Slack emoji GIFs start as wide or tall clips. Center-cropping first prevents a tiny, unreadable emoji after upload.
Fix the real failure reason
If upload fails, the cause is usually file size, non-square dimensions, too many frames, or an animation Slack cannot keep after processing.
How it works
Pick a short source GIF
Choose a clip with one clear subject. Busy scenes and long loops are hard to read at emoji size.
Compress to Slack emoji settings
Use the Slack preset to crop square, scale down, cap the loop near 50 frames, and target 128KB.
Upload the result to Slack
Download the compressed .gif, then add it in Slack as a custom emoji. If it fails, retry with fewer frames or colors.
FAQ
How do I make a Slack emoji GIF?
Start with a short GIF, crop it to a square, compress it under 128KB, then upload the downloaded .gif as a Slack custom emoji. The tool on this page applies those settings locally in your browser.
What size should a Slack GIF emoji be?
Use a square GIF at 128x128 px or smaller and keep the file under 128KB. A short loop with fewer colors usually survives Slack upload more reliably than a long, detailed animation.
Can I use this as a GIF compressor for Slack?
Yes. This page is focused on Slack custom emoji. For ordinary Slack file uploads, use [/reduce-gif-size](/reduce-gif-size) or a custom target instead.
Why does Slack say the GIF is too large?
The GIF may still be above 128KB, too large in dimensions, too long, or too complex after Slack processes it. Try a shorter loop, fewer colors, or a smaller crop.
Why does my Slack emoji stop animating?
Animation can fail when the GIF has too many frames or too much color detail. Keep the loop short and allow the compressor to trim frames when needed.
Does this upload my GIF?
No. The compression flow is designed to run locally in your browser.