How to resize an image for a Slack emoji
- Click the upload box above (or drag your image onto it).
- The tool instantly resizes it to 128×128 pixels.
- Click Download and add it under your Slack workspace's custom emoji settings.
What size is a Slack emoji?
Slack custom emojis should be 128×128 pixels and under 128KB. This tool resizes and compresses any image to fit.
Slack image size cheat sheet
| Asset | Recommended size |
|---|---|
| Custom emoji | 128 × 128 px |
| Workspace icon | 512 × 512 px |
Frequently asked questions
Is this tool free?
Yes — completely free, no signup, no watermark. Everything runs in your browser, so your images are never uploaded to any server.