Slack emoji size
The Slack emoji is 128×128 px. Resize any photo to it on your device with TryQuickImg — not uploaded to our servers for processing, no watermark.
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Quick answer
Slack custom emoji should be 128×128 px and under 128 KB. Resize with TryQuickImg, then compress if needed.
Tips
- Keep under 128 KB.
- Simple shapes read better at small size.
- Convert an iPhone photo first with HEIC to JPG if it will not upload.
Other platform sizes
GitHub social preview · Notion page cover · Zoom virtual background · TikTok profile picture · Pinterest standard pin · Threads profile picture · Open Graph link preview / social share · Spotify playlist cover · all sizes
Note: Platforms adjust their layouts over time. These are current common dimensions — ifSlack shows a different recommended size in its uploader, use that.
Frequently asked questions
What is the Slack emoji size?
Slack custom emoji should be 128×128 px and under 128 KB. Resize with TryQuickImg, then compress if needed.
How do I resize my image for Slack without losing quality?
Resize to the exact pixels (128×128) rather than cropping randomly, and start from the highest-resolution original you have. TryQuickImg draws the resized copy on a canvas in your browser, so there is no re-upload and no quality-stealing server round-trip.
Is my photo uploaded to TryQuickImg?
No. TryQuickImg runs in your browser. After the page loads you can go offline and still resize — nothing is posted to a server.