Convert a PNG to Grayscale
Turn a colour image black-and-white — a true grayscale conversion, not a washed-out desaturation. Drop one file or a batch; it runs in your browser with no upload, and any transparency is preserved. The result is a neutral gray PNG that prints and reproduces cleanly.
Drop images here
Multiple files allowed
Why it looks right, not muddy
A naïve grayscale just averages red, green and blue — which makes reds too dark and greens too light, because your eye doesn't weight the channels equally. This tool uses the standard luma formula (about 30% red, 59% green, 11% blue), so brightness matches how a scene actually looks to a human. That's the same weighting film and broadcast use.
Common uses
- Print prep — black-and-white documents, forms, and line art.
- Consistent UI — neutral icons that pick up colour from CSS instead.
- Photography — a quick monochrome pass before finer editing.
FAQ
How do I make an image black and white?
Drop it above and click Convert — the grayscale version appears with a Download link, processed entirely in your browser.
Is this the same as desaturating?
The result looks similar but the method matters: this uses perceptual luma weighting, which keeps relative brightness accurate. A flat average or a naïve desaturate can leave reds and greens looking wrong.
Does it keep transparency?
Yes — only the colours are changed; the alpha channel is untouched, so transparent areas stay transparent.