Grayscale Video Online

1. 1

   Add your video

   Drop in an MP4, MOV, MKV or WebM file. It is read on your device — nothing is uploaded.

2. 2

   Pick how colour becomes grey

   Standard luminance is the default. A red filter darkens blue sky, green lifts foliage, infrared makes leaves glow white.

3. 3

   Shape the result

   Set conversion strength for partial desaturation, then adjust contrast and brightness while watching the live preview.

4. 4

   Add a look, if you want one

   Tone the image sepia, selenium or cyanotype, add film grain, or keep one colour with colour splash.

5. 5

   Export and download

   Choose MP4, WebM or MOV and export. Keep your original if you may need the colour again — a monochrome file no longer contains it.

Grayscale removes colour distraction, evokes a classic film look, simplifies thumbnails or B-roll, and helps you match monochrome branding or archival style without reshooting. It is also the fastest way to rescue footage whose colour is beyond saving — a mixed-lighting interview or a clip shot under sodium street lights reads perfectly well in black and white.

Benefits of grayscale conversion

• Timeless look: Black-and-white styling for creative or documentary feel.
• Focus: Viewers attend to light, contrast, and motion instead of hue.
• Rescue difficult colour: Mixed or broken white balance stops mattering once colour is gone.
• Real control: Thirteen conversion methods, not one fixed formula.
• Runs on your device: No upload, no queue, no watermark — convert as soon as you are ready.
• Common outputs: Export MP4, WebM, or MOV.

There is no single correct way to turn a colour into a grey. Every method below answers the same question differently, and the difference is largest exactly where it matters — two colours that look nothing alike can collapse to the same grey under one formula and separate cleanly under another.

The five standard formulae

• Standard (Rec.709): The modern broadcast weighting — green counts most, blue least. The default, and the right answer when you have no reason to prefer another.
• Broadcast (Rec.601): The older television weighting. Slightly brighter reds and darker greens than Rec.709.
• Average: Red, green and blue counted equally. Brighter reds and blues than luminance, and technically wrong in a way many people prefer.
• Lightness: The midpoint between the brightest and darkest channel. Flatter and softer; useful when luminance crushes a saturated area.
• Value: The brightest channel alone. The highest-contrast option, and the one most likely to blow out saturated colour.

Before digital, a black-and-white photographer changed how colours mapped to grey by screwing a piece of coloured glass onto the lens. A filter lightens its own colour and darkens the opposite one. Those filters are reproduced here as channel weightings, and they are the reason two monochrome conversions of the same shot can look nothing alike.

What each filter does

• Red: Darkens blue sky to near black and makes clouds leap out. Lightens skin. The landscape and portrait classic.
• Orange: The same effect about half a stop gentler — the safe everyday choice.
• Yellow: The mildest sky filter, and what most black-and-white film was shot with by default.
• Green: Lifts foliage out of the shadows and darkens skin. Good for landscapes with heavy planting.
• Blue: Heightens haze and darkens skin — the deliberately old, plate-camera look.
• Infrared: Foliage glows white and sky goes black. The most dramatic option here by a wide margin.
• High contrast: An extreme red weighting for maximum separation, at the cost of detail in saturated areas.
• Custom mix: Set the red, green and blue weights yourself. The total controls overall brightness, so a sum above 100% lightens the whole frame.

A black-and-white print is rarely neutral grey. Darkroom toning replaces the silver with a metal compound and shifts the whole image toward a colour, and film grain is the physical silver structure the image is made of. Both are here, and both are applied to the monochrome result rather than to the colour underneath it.

Toning and grain

• Sepia: The warm brown of a thiourea-toned print. Black stays black — a toner colours by density, unlike a flat colour wash.
• Selenium: A cool purple-red. Subtle at low strength, and what most gallery prints are toned with.
• Cyanotype: Prussian blue, the oldest photographic process still in use.
• Custom hue: Any hue you like, at any strength, for a duotone that matches a brand palette.
• Film grain: Adjustable amount and size. Grain is strongest in the midtones and fades at both ends, as it does on film — a blown highlight has no silver left to be grainy.

Colour splash greys everything except one hue — a red coat in a monochrome street, a single neon sign. Pick the hue you want to keep, set how wide a band around it survives, and soften the edge so the transition is not a hard cut.

Getting a clean splash

• Pick the hue first, with the range wide, then narrow it until only the subject survives.
• Softness feathers the edge of the kept band; a little goes a long way on video, where a hard edge flickers between frames.
• Pale or washed-out subjects are the hard case: a barely-saturated colour has a hue but it is not a reliable one, so very desaturated areas are always converted.
• Hue wraps around, so red near 0° and red near 360° are the same colour and both are kept.
• Raise contrast slightly afterwards — a colour subject reads stronger against a grey frame with a little more separation in it.

The tool decodes your video, converts each frame's pixels to a single grey value per pixel using the weighting you chose, applies tone and grain, then encodes a new video in your chosen format. Audio is carried through unchanged. Everything happens on your device.

Conversion process (overview)

• Add: Load the source video — its format is checked before anything else happens.
• Choose: Pick a method, filter, tone and grain, and watch the live preview.
• Compare: Drag the before/after divider to check the conversion against the original.
• Export: Encode the monochrome video as MP4, WebM or MOV.
• Download: Save the new file, or the whole batch as one ZIP.

Useful context before you export.

Key points

• Original colour information is not recoverable from a monochrome export — keep a colour master if you may need it.
• Resolution, frame rate and duration are preserved; only the pixels change.
• A monochrome encode usually produces a smaller file than the colour source, because two of the three colour planes become constant.
• The preview is the same code that produces the export, at a smaller size — what you see is what you get.
• Free converts one video at a time; Pro queues a batch and downloads it as one ZIP.

Guidelines for better results.

Quality and format

• Start from the highest-quality source you have — monochrome exposes banding that colour hides.
• Choose MP4 when you are unsure what will play it; WebM is usually smaller.
• Try a red or orange filter before reaching for the contrast slider; a filter separates tones that contrast can only stretch.
• Check the result on the screen it is for — monochrome contrast reads very differently on a phone and a monitor.
• Keep an unmodified colour copy before any destructive creative pass.

Common use cases

• Creative / social: Monochrome aesthetics for reels or posts.
• Archival / documentary: A neutral look for interviews or B-roll.
• Rescuing colour: Mixed lighting and broken white balance stop mattering.
• Thumbnails / tests: Quick grayscale versions for layout checks.
• Branding: Match a black-and-white campaign, or a duotone brand palette.

Frames are decoded to pixels; each pixel's red, green and blue are combined into one brightness value using the weighting you chose, then written back as an equal-channel grey. Toning maps that grey along a black-to-colour-to-white ramp, grain adds a deterministic per-pixel variation, and the result is re-encoded into your chosen container. The whole per-pixel stage runs on your device's graphics hardware, and the frame is never copied back out to be worked on.

Technical process

• Read: The container is parsed and the codec checked before anything is decoded, so an unreadable file is refused immediately rather than after a wait.
• Decode: Video frames are decoded using your device's own media hardware.
• Convert: Each frame is converted in a single hardware-accelerated pass — method, filter, strength, tone, contrast, brightness, grain and splash all at once.
• Encode: A new video is written in the chosen format, at a bitrate derived from what your source actually used rather than from a fixed preset.
• Download: The result is saved from your device. It was never sent anywhere.

Hardware accelerated on your device — nothing is uploaded.

• Video compressor
• Video resizer
• Video cutter
• Video cropper
• Color correction
• Video effects