How to Make a Slack Emoji GIF
Follow this step-by-step guide to turn a normal GIF into a Slack custom emoji. Slack says square images under 128KB work best and animated GIFs can include up to 50 frames. The embedded tool applies a practical 128×128 output locally.
Files stay in your browser. No upload. No watermark.
Make Slack Emoji GIFDrop a GIF here
or
Start with Slack's file rules
Slack says square images under 128KB work best and animated GIFs can include up to 50 frames. This guide uses 128x128 as a practical standard output, not an official pixel maximum.
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?
Slack does not publish a pixel maximum. It says square images under 128KB work best and GIFs can include up to 50 frames. This tool outputs 128x128 px because it is a practical size for emoji display.
Where do I compress the GIF for Slack?
Use the dedicated [GIF Compressor for Slack](/slack-emoji-gif) — it crops to a square, scales to 128 px, and compresses under 128KB in one step, locally in your browser. The tool embedded on this page applies the same Slack preset.
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.