EmojiMaker
Slack Emoji Maker: Custom Emojis Sized for Slack
Design a custom emoji and export a Slack-ready 128×128 transparent PNG — under the 128KB limit, no sign-up, no watermark.
- 128×128 preset
- < 128KB output
- Transparent PNG
- Free forever
Emoji preview and export
Customize emoji parts
Upload guide
How to add your emoji to Slack
- Design and download your emojiUse the maker above, choose the 128×128 export size and download the PNG. It lands well under Slack’s 128KB limit.
- Open Slack’s emoji settingsIn Slack, click your workspace name → Customize Workspace → Emoji, or go to add emoji directly from any emoji picker via “Add emoji”.
- Upload and name itClick “Add Custom Emoji”, upload the PNG, give it a name like :party-blob: and save. It’s instantly available to everyone in the workspace.
Slack custom emoji requirements
| Requirement | Slack’s rule | What this maker exports |
|---|---|---|
| Dimensions | Resized to 128×128 | Exact 128×128 PNG |
| File size | Under 128KB | Typically 5–30KB |
| Formats | PNG, JPG, GIF | PNG (transparent) |
| Background | Transparent recommended | Transparent by default |
Tip: bold shapes and high contrast survive Slack's small reaction size best. Test your emoji at 22px (reaction size) — if it still reads, it's a keeper. Need Discord or Twitch versions of the same emoji? Use the Discord emoji maker or the Twitch emote maker for the right sizes.
Frequently asked questions
What size should a Slack emoji be?
Slack resizes uploads to fit a 128×128 pixel square and requires files under 128KB. A 128×128 PNG with a transparent background — exactly what this maker exports — is the sweet spot: sharp, small, and no cropping surprises.
How do I add a custom emoji to Slack?
Click your workspace name → Customize Workspace → Emoji → Add Custom Emoji, then upload the PNG and pick a name. Any member can do this unless admins restricted it. The emoji becomes available workspace-wide immediately.
Can Slack emojis be animated?
Yes — Slack accepts animated GIFs as custom emojis (still under 128KB). This maker exports static PNG/SVG; for most reaction emojis a crisp static image reads better at small sizes anyway.
Is this Slack emoji maker free?
Yes. No sign-up, no watermark, unlimited downloads. Everything runs in your browser, so your emoji never touches a server.
Do custom emojis work in Slack threads and reactions?
Yes. Once uploaded, your custom emoji behaves like any built-in emoji: use it in messages with :name:, as a reaction, and in statuses.