Duotone Image Generator
Apply a two-colour duotone effect to your own image — the poster-style look popularised by Spotify.
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About this tool
Converts your image to grayscale, then maps dark tones to the shadow colour and light tones to the highlight colour — everything happens on canvas, in your browser.
Pick any two colours: a dark shadow and a light highlight give the classic look, while swapping them gives an inverted, X-ray style. Very large photos are scaled to 2,400 pixels on the longest side so the effect stays quick on phones, which is plenty for social media and web use. Your image never leaves your device.