Image Duotone & Color Effects
Apply duotone and classic color effects to an image and download the result. Duotone maps each pixel's brightness onto a gradient between two colors you choose (Spotify-style); or pick grayscale, sepia, invert, threshold, or posterize. Everything is computed per-pixel on a canvas at the image's full resolution; nothing is uploaded.
or drop / paste (Ctrl/⌘+V). PNG, JPG, WebP, GIF, BMP.
Load an image to begin.
Duotone works by converting each pixel to its brightness, applying an optional contrast S-curve, then sampling that position along a gradient from your shadow color to your highlight color. Grayscale uses the standard luminance weighting (0.299 R + 0.587 G + 0.114 B); sepia applies the classic tone matrix; posterize quantizes each channel to N levels. The result is rendered at full resolution and downloaded losslessly as PNG. No network requests are made.