Convert an image to grayscale
Remove colour from a photo using true luminance weighting, not a flat average.
Processed in your browser
Drop your image here
or choose an image from your device
Accepts JPG, PNG or WEBP · max 25.00 MB
How to use it
- 1Drop a JPG, PNG or WEBP photo into the upload area.
- 2Press Convert. Each pixel is recomputed with Rec. 709 luminance weighting — 21% red, 72% green, 7% blue — rather than a flat average of the three channels.
- 3Compare the preview: skies and skin tones keep sensible brightness relationships instead of going muddy.
- 4Download the black-and-white file in the same format you uploaded.
Frequently asked questions
Why use luminance weighting instead of averaging R, G and B?
The eye is far more sensitive to green than to blue. A flat average makes red and blue areas look unnaturally bright and green foliage too dark; Rec. 709 weighting matches perceived brightness.
Will the grayscale file be smaller?
Usually a little, because the colour channels now carry no variation, but the file is still saved as a normal colour-capable JPG, PNG or WEBP rather than a true single-channel greyscale image.
Is transparency preserved?
Yes for PNG and WEBP — only the colour values change, the alpha channel is left alone.
Can I get a sepia or duotone look instead?
Not here. This tool does one thing: neutral greyscale. Tinting would need colour controls that would make the result unpredictable without a live preview.
Related tools
- Crop ImageTrim an image to the exact area you want, using pixel-accurate crop values.
- Rotate ImageRotate photos by 90, 180 or 270 degrees and download the corrected file.
- Flip ImageMirror an image horizontally or vertically, then download the result.
- Image CompressorReduce JPG, PNG or WEBP file size with a quality slider you control. Compression happens in your browser.