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Choose imageAbout the Duotone Effect
Give any photo the bold two-colour treatment made famous by Spotify's artwork: pick one colour for shadows and another for highlights, and the tool remaps every pixel's brightness onto that gradient. Four curated presets get you started — deep navy to coral, plum to gold and more — or dial in your exact brand colours with the pickers for a perfectly on-palette result.
Duotones are a designer's shortcut to visual consistency: hero images, event posters, album art and team-page portraits all read as a set when they share the same two-colour scheme, even if the source photos are wildly different. The luminance mapping runs pixel-by-pixel on a canvas in your browser, so your photos stay on your device and the finished PNG downloads at full resolution.
Features
- Independent colour pickers for shadows and highlights
- Four ready-made duotone presets to start from
- Smooth luminance mapping across the full tonal range
- Instant preview with every colour change
- Full-resolution PNG download of the result
- Pixels processed locally — the photo never leaves your device
How to create a duotone image online
- Upload the photo you want to stylise.
- Try a preset gradient, or pick your own shadow colour.
- Choose a highlight colour — light tones give the best contrast.
- Fine-tune both colours while watching the live preview.
- Download the finished duotone as a PNG.
Frequently asked questions
What exactly is a duotone effect?
A duotone reduces an image to two colours: the photo is first read as brightness values, then dark areas are painted in your shadow colour and bright areas in your highlight colour, with smooth blends in between. It originated in two-ink printing and became a signature look of modern digital branding.
Which colour combinations work best?
Pick a dark, saturated shadow and a light, vivid highlight — the bigger the brightness gap between them, the more detail survives the mapping. Navy with coral, deep purple with yellow, and forest green with mint are reliable pairings; two mid-tone colours tend to produce a muddy result.
Can I use my brand colours for the duotone?
Yes — both pickers accept any hex value, so you can enter your exact brand palette. This is the classic way to make stock photos and mixed-source imagery feel unified on a website: run everything through the same two colours and the set instantly looks art-directed.
Does the duotone effect work on any photo?
Any raster image works — JPG, PNG or WebP. Photos with strong tonal contrast and clear subjects convert most dramatically; flat, low-contrast images may benefit from a contrast boost in the Tooldoodle image editor first, since the effect is driven entirely by brightness differences.
Is my picture uploaded to apply the effect?
No. The colour remapping is computed on your own device, pixel by pixel, inside the browser — there's no server-side processing at all. Combined with being free and sign-up-free, that makes it safe to stylise client work and unreleased campaign images.