About this tool
Duotone converts your image to greyscale and maps the full tonal range between two colours — one for the darkest shadows, one for the brightest highlights. Five curated presets get you started instantly.
How it works
- 1Upload your image.
- 2Choose a shadow colour and a highlight colour, or pick a preset.
- 3Each pixel's grey value is linearly mapped between the two colours.
- 4Download your duotone image as a PNG.
Common use cases
- ✓Spotify-style music artwork
- ✓Event poster design
- ✓Brand-aligned photography
- ✓Creative social media content
Privacy first. Duotone runs entirely inside your browser using the HTML5 Canvas API. Your images are never uploaded to any server, stored anywhere or shared with third parties. Everything happens locally on your device.
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