31st July 2026
Tool
Slack Emoji Maker
— Create custom Slack emoji from any image by automatically removing backgrounds, cropping to square, and resizing to meet Slack's requirements (under 128KB PNG). The tool provides visual editing controls including color-based background removal, square cropping with handles, transparency trimming, and color reduction, along with real-time preview in light and dark Slack themes.
I wanted to create a new Slack emoji, and their tool recommends a square that's 128x128 and has a transparent background... so I had Fable build me this simple image editor against those requirements.
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