How accurate is the AI colorization?

Results are plausible and often impressive for portraits and landscapes, but colors are predicted, not exact. Historical color accuracy cannot be guaranteed.

Can I control which colors are applied?

Yes, the color hint mode lets you paint color suggestions onto regions of the image to guide the AI.

What is the maximum resolution supported?

Up to 4000×4000 pixels. Larger images are automatically downscaled for processing then upscaled back.

Does it work for photos with mixed grayscale and color?

The tool works best with fully grayscale photos. Partially colored images may produce inconsistent results.

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🖼️

🌐 Runs in Browser⏱ Est. 5–20 seconds

Photo Colorizer

Bring black & white photos to life with AI-powered colorization

Try It Now — Free

What is Photo Colorizer?

Automatically colorize black and white photos using a deep learning model running in your browser. Upload historical photos, portraits, or any grayscale image and see them in full color within seconds.

Key Features

AI-powered automatic colorization in browser

High-resolution output up to 4K

Interactive slider to compare original and colorized

Manual color hint mode for precise control

Batch colorization of multiple photos

Download as PNG or JPEG

No data sent to server — fully private

Optimized for portraits, landscapes, and architecture

How It Works

Upload Photo

Drop a black and white or grayscale photo. JPEG, PNG, and WebP are supported.

AI Processing

A convolutional neural network analyzes the image and predicts natural colors for each region.

Review

Use the comparison slider to see the before and after. Add color hints if needed.

Download

Save the colorized image in full quality.

Who Is This For?

▸Restoring and colorizing family archive photos
▸History educators creating engaging visual materials
▸Documentary filmmakers adding color to historical footage
▸Artists and photographers exploring creative reinterpretations

Why Use Photo Colorizer?

Unlike cloud-based alternatives that upload your files to remote servers, Photo Colorizer runs entirely in your browser. Your data stays private. No account, no subscription, no upload limits — just instant results. Built with cutting-edge web technologies including WebAssembly and WebGL for near-native performance.

Technical Details

Uses a DeOldify-inspired CNN model converted to ONNX and run via ONNX Runtime Web in a Web Worker. The model operates in LAB color space, predicting A and B channels from the L (luminance) channel.