TFT
100% Free & Private

Convert Video to Black and White Online Free

Remove all color from your video and produce a clean grayscale MP4 in your browser. The encoder rewrites every frame using luminance values only, with no quality loss and no watermarks. Your original file stays untouched until you download the output.

Video Grayscale Converter

What Grayscale Conversion Does

Grayscale conversion removes all color information from your video. The tool reads each pixel's red, green, and blue values and replaces them with a single luminance value based on how bright that pixel appears. The result is a video using only shades of gray — from black to white — with no color remaining.

This isn't a CSS filter or preview effect. The grayscale data is written into every frame of the output MP4. The file plays in black and white on every device, player, and platform — no settings required.

Your original file isn't modified. You get a new grayscale MP4 to download.

When You'd Use This

Matching modern footage to archival film

Documentary makers cutting between new interviews and 1940s footage need them to match. Converting the new clips to grayscale removes the jarring color difference. Both clips sit in the same tonal range.

Fixing unworkable mixed lighting

Mixed light sources — warm tungsten on one side, cool daylight on the other — create color shifts that are hard to fix. Removing color entirely eliminates the problem. The result looks intentional, not broken.

Creating a stark, dramatic mood

Color carries emotional warmth. Removing it shifts the mood toward something more formal or timeless. Filmmakers use grayscale for memorial content, dramatic flashbacks, and opening credits.

High-contrast art or music videos

Without color to draw the eye, shapes, edges, and lighting become the dominant elements. Musicians and visual artists use grayscale for a raw, stripped-down aesthetic that emphasizes contrast and form.

Preparing for monochrome displays

Some digital signage, e-ink displays, and print workflows only support grayscale. Converting before export lets you see the actual monochrome appearance — not an approximation by the display driver.

How Grayscale Conversion Works

Luminance Calculation

The tool reads each pixel's red, green, and blue values. It calculates a weighted average — green counts more (human eyes are more sensitive to it), red counts less, blue counts least. That single luminance value replaces all three color channels. The result preserves the original lighting and contrast, just without hue.

Permanent Encoding

The grayscale data is written into every frame of a new MP4 file. This isn't a filter that can be toggled off — the color data is gone from the output file. The video plays in black and white everywhere, on every player and platform.

Browser-Based Processing

The tool uses OffscreenCanvas to process frames without freezing your browser. Encoding happens in the background, keeping the interface responsive. Your file stays local — no upload to servers.

How to Convert to Grayscale

1

Upload your video

Select or drag your file. It stays on your device — no server upload. The preview shows the original color footage.

2

Convert to grayscale

Click Convert to Grayscale. The encoder processes each frame, calculates luminance values, and writes a new MP4. Keep the tab open during processing.

3

Preview and download

When done, toggle between Original and Grayscale to compare. The output is a true grayscale MP4 — plays in black and white everywhere. Download when satisfied.

Frequently Asked Questions

Everything you need to know about grayscale conversion

Open the file picker and select your video. Click Convert to Grayscale and wait for the progress bar to reach 100%. The encoder applies a grayscale filter to every frame in your browser using your device's CPU. When it finishes, click Download to save the black and white MP4. No software installation is required and nothing is uploaded to a server.
Not directly. Grayscale conversion removes color channel data from the visual output but the MP4 container still stores the three color channels at zero saturation internally. The output file size will be close to the same as the original. If you also need a smaller file, run the output through a video compressor after the grayscale conversion.
Processing speed depends on your device's processor and the length of your video. A two-minute 1080p clip takes about one to three minutes on a mid-range laptop. A longer 4K recording can take ten minutes or more. Keep the browser tab active and avoid running other heavy tasks while the encoder works.
No watermark is added to the output. All processing runs on your device using your own CPU. There is no cloud server cost involved, so no subscription or payment is required to remove a watermark.
No. The encoder targets only the video frames. The audio data is copied from the source file into the output MP4 unchanged. Your dialogue, music, and any other audio recorded with the video will play back at the same quality in the grayscale output.
No. The encoder rewrites the color information in every frame of the output file. The resulting MP4 contains grayscale pixel data at the file level, not a filter layer that can be switched off. Your original file is not modified. If you need the color version again, use your original source file.

More Video Tools

Explore our other free video editing tools

Change Video FPS

Change video frame rate online - 24fps, 30fps, 60fps

Crop Video

Crop videos online for free - remove unwanted edges

Enhance Video Quality

Upscale, sharpen and improve video quality online

Extract Audio from Video

Extract MP3, AAC, WAV audio from video files

Resize Video Dimensions

Scale video to 4K, 1080p, 720p or custom sizes

Rotate Video

Rotate videos 90, 180, 270 degrees online

Video Color Space Transformer

Adjust brightness, contrast, saturation and hue

Video Compressor

Compress videos online - reduce file size

Video Format Converter

Convert between video formats

Video Metadata Viewer

View video and audio file metadata

Video Overlays

Add watermark or logo to video online

Video Player

Play any video file format instantly

Video Transparency Maker

Adjust video opacity and transparency online