Yes, with no watermark and no page limit.

Does it need an account?

No. There is no account system.

Is my file processed on my device?

Yes. The file is read by your browser and never uploaded. There is no server to send it to.

What formats are supported?

JPG, PNG and WebP in. The same format out, so nothing else about the file changes.

No image count limit. Very large images are bounded by the memory your browser gives a canvas.

Does it work on mobile?

Yes, on any modern mobile browser. Large files are limited by the memory the phone gives the browser.

Does it work offline?

Yes, once the page has loaded. The tool keeps working with no network connection.

Why do some black and white converters look flat?

Because they average the red, green and blue channels equally. To an eye, green is roughly five times brighter than blue, so an average renders a vivid green leaf and a deep blue sky as near-identical grey. This page uses the Rec. 709 weights that sRGB is defined against, which keeps the contrast that was actually there.

Is this the same as removing saturation?

Close, but not identical. Desaturating in some editors uses a different formula, often the midpoint between the lightest and darkest channel, which produces a flatter picture. Luminance weighting is the version that matches how the scene looked.

Can I get the colour back afterwards?

No. Converting to grey discards the colour information, so keep the original if you may want it. This tool never overwrites your file, it produces a new one.

Drop images hereor choose files from this deviceChoose filesJPG, PNG and WebP · never uploaded · no image count limit

IMAGE -> GRAYSCALE · Local tool

Grayscale image

Convert a colour image to black and white.

Last updated 3 September 2026

01 / Your device
the file stays here
02 / Browser memory
the work runs locally
03 / Your downloads
the result arrives here

How it works / no cloud

A conversion engine, not an upload form.

filetity reads the pixels in your browser and replaces each one with its Rec. 709 luminance, which weights green far above red and blue because that is how human vision responds. Averaging the three channels instead is the common shortcut, and it renders bright green and deep blue as the same grey.

Offline ready
Installable app
No file limit queue

Straight answers

No accordion. Nothing hidden.

Is it free?: Yes, with no watermark and no page limit.
Does it need an account?: No. There is no account system.
Is my file processed on my device?: Yes. The file is read by your browser and never uploaded. There is no server to send it to.
What formats are supported?: JPG, PNG and WebP in. The same format out, so nothing else about the file changes.
What are the limits?: No image count limit. Very large images are bounded by the memory your browser gives a canvas.
Does it work on mobile?: Yes, on any modern mobile browser. Large files are limited by the memory the phone gives the browser.
Does it work offline?: Yes, once the page has loaded. The tool keeps working with no network connection.
Why do some black and white converters look flat?: Because they average the red, green and blue channels equally. To an eye, green is roughly five times brighter than blue, so an average renders a vivid green leaf and a deep blue sky as near-identical grey. This page uses the Rec. 709 weights that sRGB is defined against, which keeps the contrast that was actually there.
Is this the same as removing saturation?: Close, but not identical. Desaturating in some editors uses a different formula, often the midpoint between the lightest and darkest channel, which produces a flatter picture. Luminance weighting is the version that matches how the scene looked.
Can I get the colour back afterwards?: No. Converting to grey discards the colour information, so keep the original if you may want it. This tool never overwrites your file, it produces a new one.

Keep working locally

4 available · more coming