Map an image locally onto two colours - shadows in one, highlights in the other. No upload.
Running locally on your device ...
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Your files never left your device
No. Everything runs in your browser - your file never leaves your device. How this is verifiable
A duotone maps the brightness of an image onto a gradient between exactly two colours: the dark areas take a deep shadow tone, the bright areas a vivid highlight tone, and the midtones blend in between. The original colours are fully replaced by the two chosen hues.
The duotone look is familiar from posters, music covers and modern web design (for example a strong blue paired with a warm orange). Two sliders let you pick the shadow and highlight hue freely on the colour wheel. The result is an atmospheric, graphic image with a clear colour identity. The output keeps your original format and dimensions.
Everything runs entirely locally in your browser on a canvas (no upload, even offline) - your image never leaves your device. The luminance of each pixel is computed and then interpolated between the shadow and highlight colour. Animated images are flattened to a single frame.
| Input formats | JPG, JPEG, PNG, WEBP |
|---|---|
| Output format | JPG |
| Batch processing | Yes |
| Processing | Locally in your browser (JavaScript) |
| File upload | None |
Limitations: Maps the luminance of each pixel onto a gradient between a dark shadow colour (shadow hue) and a light highlight colour (highlight hue); the original colours are lost. The original format and dimensions are preserved (PNG keeps transparency; JPEG flattens onto white). Animated inputs are reduced to a single frame.
No. The duotone effect runs entirely locally in the browser on a canvas - even offline. Your image never leaves your device.
Tinting uses a single hue; a duotone maps shadows and highlights onto two different colours and therefore looks more contrasty.
No, and that is intended: only the brightness matters, the colour comes from the two chosen tones.
Yes. A PNG stays a PNG (with transparency), a JPEG stays a JPEG, and the dimensions are unchanged.