software · Picked by us

Turn a picture into your own Slack emoji

Slack Emoji Maker

Crop a picture, remove its background and save a small PNG for Slack.

By Simon Willison

Make an emoji
Read the making-of

Free; creator's development record

Get the code

Free; Apache 2.0 licence

Free; no sign-in to make the file

The Slack Emoji Maker with our orange M logo, image controls and a PNG download button.
A look at the result

What it does

Make a square emoji image without a full image editor.

Who it helps

People who want custom emoji for their team or community.

How it was made

Models
Claude · version not given
Tools
Claude Code · AI coding
  1. Simon described the image format, size limit and editing controls he wanted.
  2. His development record links the Claude Code session.

What the person did

Simon chose the requirements. Later manual changes are not listed.

What we know

Creator-reported: The development record links Claude Code; it does not name the exact model version.

Access checked — 2026-09-20 · Loaded our logo, resized it to 128 × 128 and downloaded the PNG. Background removal also passed our 19 September check. We did not add the result to a Slack workspace.

Can you use it?

Tool and preview: Simon Willison, Apache 2.0. Keep the licence and required notices when reusing the code. The preview uses our own Made With Models logo. You need the right to use any picture you upload. This feature does not imply an endorsement by the creator or Slack.

About this project

Picked by Made With Models. Added 2026-09-20. Updated 2026-09-20.