Yes. Rev Chroma is free with no sign-up and no watermark. The AI runs on your own device, so there are no server costs to pass on.

How long does it take to colorize a full movie?

It depends on your graphics hardware, output resolution and speed setting. Rev Chroma shows live frames per second and the remaining time. A feature film on a typical laptop can take several hours; the 'every 3rd or 6th frame' speed settings cut that substantially.

What AI model does Rev Chroma use?

DDColor (ICCV 2023), an open-source, Apache-2.0 licensed colorization model, running through ONNX Runtime Web with WebGPU acceleration.

Colorize Black & White Movies with AI

Q: Are my movies uploaded anywhere?

No. Your video never leaves your device. The only download is the AI model itself (about 135 MB, one time), which is then cached by your browser.

Q: Which browsers work best?

Desktop Chrome or Edge give the best speed (WebGPU) and can stream feature-length output straight to disk. Safari 17+ and Android Chrome also work.

Bring classic films and family photos to life in full color — free, private, and right in your browser. Your video never leaves your device.

🎞

Drop your black & white movie here
or tap to choose · MP4 · MOV · M4V · WebM

Advanced

Use your own DDColor-compatible ONNX model (1×3×512×512 in → 1×2×512×512 ab out)

How to colorize a black and white movie

Open your film. Drop in an MP4, MOV, M4V or WebM file. Public-domain classics from archives work great.
Preview a scene. Pause anywhere and tap Preview this frame to compare original and color side by side.
Pick your settings. Choose resolution, speed and flicker reduction. Set a start/end time to do a single scene.
Colorize & save. Rev Chroma colorizes every frame and writes an MP4 with the original soundtrack.

Why Rev Chroma

🔒 100% private

The AI runs on your own device. Your movies and photos are never uploaded.

⚡ GPU accelerated

Uses WebGPU for fast AI on modern graphics chips, with automatic CPU fallback.

🎞 Feature-length export

Streams straight to disk in Chrome and Edge, so full movies don't run out of memory.

🔊 Original audio kept

AAC soundtracks are copied bit-for-bit — no quality loss.

🌗 Full-resolution detail

Only color is predicted; every bit of the original brightness detail is preserved at full resolution.

🎚 Flicker reduction

Temporal color smoothing with automatic scene-cut detection keeps colors steady.

Frequently asked questions

Is Rev Chroma free?

Yes — no sign-up, no watermark. The AI runs on your device, so there are no server costs.

Are my movies uploaded anywhere?

No. Your files never leave your device. The only download is the AI model (about 135 MB, one time), which your browser then keeps cached.

How long does a full movie take?

It depends on your graphics hardware, resolution and speed setting — the app shows live frames per second and time remaining. A feature film on a typical laptop can take several hours; the faster speed settings cut that substantially. Try a one-minute range first to see your speed.

What AI model is used?

DDColor (ICCV 2023), Apache-2.0 licensed, running via ONNX Runtime Web.

Which browsers work best?

Desktop Chrome or Edge: fastest, and can save feature-length films directly to disk. Safari 17+ and Android Chrome work too (in-memory export, best for shorter clips).

Are the colors historically accurate?

No AI can know the true original colors. The model predicts plausible, natural colors for skin, sky, foliage and common objects. Clothing and painted objects may differ from the real originals.

Can I colorize any movie?

Colorize films you own the rights to or that are in the public domain. Many pre-1930 US films and countless newsreels and home movies are public domain.