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Duotone Generator

Map the luminance of any photo between two colours and export a clean duotone image.

Build a duotone image

Download PNG
Mapping: —
Luminance is mapped between your two colours on a local canvas, so the photo never leaves your device.

How to use the Duotone Generator

  1. Load the photo you want to convert into a duotone image.
  2. Pick a preset or set your own shadow and highlight colours.
  3. Adjust the colour strength and download the finished PNG.

Features

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Frequently Asked Questions

Common questions about the free online duotone generator.

A duotone replaces the greyscale range of a photo with a gradient between two colours, giving one colour for shadows and another for highlights.
Each pixel is converted to a luminance value with the standard weights, then that value mixes the shadow and highlight colours together.
Yes. Pick any two colours with the shadow and highlight colour inputs, or start from one of the six presets and adjust them.
It blends between the original photo and the duotone result. A lower value keeps more of the original colour for a gentler effect.
No. The conversion happens in your browser on a local canvas, so the image is never transmitted anywhere.
Cyanotype, sepia, magenta dusk, navy and gold, forest and a neutral mono preset, all of which you can edit after choosing.
Yes. The download link saves the current preview as a PNG file with full quality and transparency preserved.
Yes. The generator is fully responsive and works in any modern mobile browser, including loading photos from the camera roll.
Yes. It is completely free with no account, no watermark and no limit on how many images you convert.

Last updated: October 10, 2026