Colorize Black & White Photos Online Free — AI Photo Colorizer

How AI photo colorization works here

The approach

The neural network looks at the grayscale image and predicts a full-color version. We then take only the predicted colors and re-apply your photo's original brightness on top — technically we merge the model's color channels (a/b in LAB space) with the original lightness channel. That's why details, shadows, and contrast survive instead of being washed out by the model.

The color intensity slider scales the predicted colors up or down, so you can go from subtle tinting to vivid color.

What works best

• Portraits and people photos — skin tones and clothing are well represented in the training data
• Landscapes and street scenes with clear objects
• Scans of old photos (any scan artifacts are inherited, so clean scans colorize better)

Highly unusual subjects or heavy damage can produce guessed-at colors — colorization is always an interpretation, since the original colors are gone.

Why your photos stay private

Commercial colorizers ask you to upload your photos — often old family pictures, the most personal kind. Here the model runs locally via WebAssembly: only the model itself is downloaded (once, from Hugging Face), and your image never leaves your computer.