Image to Grayscale
Convert any image to black & white in your browser.
How to use
- 1 Drop an image onto the box, or click to choose a file.
- 2 Pick a grayscale method: luminance, average or lightness.
- 3 Compare the live preview.
- 4 Click Download PNG to save the black-and-white image.
About Image to Grayscale
The Image to Grayscale tool strips the colour from any picture and returns a clean black-and-white version, with a choice of three conversion methods so you can match the result to the job.
Drop in a JPEG, PNG, WebP or GIF and it is decoded, processed and previewed entirely inside your browser.
Not all grayscale is the same.
The "luminance" method weights red, green and blue the way the human eye perceives brightness (the Rec. 601 standard), which keeps the tonal relationships looking natural — a red and a green of equal lightness end up distinct rather than identical.
The "average" method simply means the three channels, which is fast and predictable, while "lightness" splits the difference between the brightest and darkest channel for a softer, higher-key look.
Switching between them updates the preview instantly so you can pick the one that reads best.
Because every step happens on your own device, nothing is uploaded, stored or logged — making it safe for private photos, screenshots or client work — and it keeps working offline once the page has loaded.
When you are happy, download a lossless PNG of the result.
FAQ
Is my image uploaded anywhere?
No. The picture is decoded and converted with the Canvas API inside your browser, so it never leaves your device.
Which method should I use?
Luminance looks the most natural for photos; average is a neutral middle ground; lightness gives a brighter, lower-contrast result. Try each and compare.
What format is the download?
A lossless PNG, which preserves the exact grayscale values and any transparency in the original.