Black and White Video Converter
Turn any clip into a classic grayscale video. Everything renders locally on your device - no upload, no watermark, no account.
A black and white video shifts attention from color to light, shadow, shape and movement. If your clip feels busy, mismatched or too modern, grayscale can give it a cleaner visual direction without changing the cut.
This helps when your footage comes from different cameras, mixed lighting or a quick phone shoot. Removing color will not fix exposure by itself, but it can make a short reel, interview insert or documentary clip feel more consistent.
You also get a private workflow. The conversion runs in your browser, so your file stays on your device instead of being uploaded to a remote video converter.
Grayscale is not just color with the saturation turned off. After color is removed, separation depends on brightness values, so a red shirt and a dark background may blend together even if they looked clearly different in color.
Before you export, look at faces, text, product edges and anything that must stay readable. If the subject disappears into the background, open the clip in [GrepCut Studio](/) and add contrast, a vignette or a different color grade before the final export.
If you want a harsh two-tone poster effect, this quick tool is not the right control. It creates a full grayscale video, not a black-only and white-only threshold pass.
Your video track is re-encoded because GrepCut redraws every frame in black and white. The export is designed for a clean H.264 MP4 result, but it is still a new encode rather than a loss-free remux.
Processing time depends on your clip length, resolution and device. A short 1080p social clip can finish quickly, while a long 4K file needs more memory and browser work because the frames are processed locally.
Black and white does not automatically mean a tiny file. File size still depends on duration, resolution, motion, codec and encode settings, not only on whether your video has color.
Can you convert a video to black and white without uploading it?
Yes. GrepCut runs the grayscale conversion in your browser, so your file stays on your device during processing.
Will your audio change when you make the video grayscale?
No visual effect is applied to the audio. GrepCut changes the video frames and keeps the audio compatible with the exported MP4.
Can you control how strong the black and white effect is?
This quick tool applies full grayscale automatically. If you need partial desaturation, extra contrast, a vignette or a LUT, open your clip in [GrepCut Studio](/).
Can you make a pure black and white threshold video?
Not with this quick converter. It creates grayscale with shades of gray, not a two-tone threshold effect with only black and white pixels.
Will a black and white video be smaller than the color original?
Not reliably. Your file size depends on resolution, duration, motion and the H.264 MP4 encode, so grayscale alone is not a file-size guarantee.
What formats can you add?
You can add common video files such as MP4, MOV, WebM and MKV. The exported file is an H.264 MP4.
Why do you need a WebCodecs-capable browser?
GrepCut uses browser video decoding and encoding so it can process your frames locally. A WebCodecs-capable desktop browser gives the tool access to that in-browser pipeline.
Can you add color grading after grayscale?
Yes. You can grade the black and white result for contrast, mood or tint. A LUT will not restore original colors after you export full grayscale, so keep your source file if you may need color later.