AI Mattermost Emoji Generator
Mattermost emoji maker
Make custom Mattermost emoji with AI. Describe any emoji, generate a crisp transparent-background PNG, and add it to Mattermost in seconds. Mattermost mirrors Slack-style custom emoji for teams that self-host - upload once and the whole workspace can react with it.
Emojis you create are public and may appear in Explore.
How to add a custom emoji to Mattermost
- 1
Download your emoji as a transparent PNG.
- 2
Open the emoji picker → Custom Emoji → Add Custom Emoji.
- 3
Name it and upload the PNG.
- 4
Use it in any channel or as a reaction.
What people actually make Mattermost emoji for
Mattermost is usually chosen by teams that want to self-host, which means the emoji set is genuinely theirs - it lives on their own server and nobody else's policy governs it. In practice the sets look a lot like Slack's: build failures, deploy jokes, and one emoji per recurring meeting.
Referenced as :name: and added through the emoji picker, in the same shape as Slack, which makes migrating a set straightforward.
Worth knowing before you upload
- Because Mattermost is self-hosted, upload limits and permissions are whatever your administrator configured, so they vary between instances rather than being fixed.
- Teams migrating from Slack usually want their old emoji. The files transfer directly, but names have to be re-entered on the new server.
- Emoji render small in reactions here too, so the Slack rule applies: bold shape, transparent background, no small text.
Make a Mattermost emoji with AI
1. Describe it
Type the emoji you want - a mascot, a reaction, an in-joke for your Mattermost space.
2. Generate
AI renders a glossy, transparent emoji in about a minute. Tweak and regenerate freely.
3. Add to Mattermost
Download the PNG and upload it following the steps above (Transparent PNG, up to 1 MB).
Mattermost emoji FAQ
What size should a Mattermost emoji be?
A square transparent PNG up to about 1 MB, though the exact ceiling depends on how your server is configured. Keeping close to 128 pixels matches how it renders.
Can I move our Slack emoji to Mattermost?
Yes. The image files work as they are - you re-upload each one and give it the same name, and reactions behave the same way afterwards.
Who can add emoji in Mattermost?
That depends on your server's permission settings. Many instances allow any member to add them, but an administrator can restrict it.