Slack Emoji Maker

Turn any image into a custom Slack emoji: square, transparent background, PNG under 128KB.

Drag and drop an image here, click to select a file, or paste from your clipboard
JPG, PNG, GIF, WebP, SVG… anything your browser can open. Very large images are scaled down to 1024px.

Click anywhere on the image to remove that color. The checkerboard shows transparent areas.

Remove background
25

Higher tolerance removes a wider range of similar colors. Undo and retry if it eats too much.

Make it square
Shrink

Slack displays emoji at up to 128×128, so resizing to 128px is almost always the right move.

Result
… checking…
:emoji:
Preview in Slack
22px preview on light background 64px preview on light background Light mode
22px preview on dark background 64px preview on dark background Dark mode

Slack custom emoji work best as square PNGs with transparent backgrounds, under 128KB — Slack scales them down to 128×128. Add yours in Slack via your workspace name → Customize workspace, or the "Add emoji" button in the emoji picker.