Grayscale Image Converter
Turn any image black and white.
Drop an image to convert to grayscale
or click to choose · nothing is uploaded — runs in your browser
Free online grayscale converter. Turn any image black and white using a luminance-accurate formula, then download the result as PNG. Runs entirely in your browser — nothing is uploaded.
How to use the Grayscale Image Converter
- 01Drop or choose an image.
- 02It's converted to grayscale instantly on a canvas.
- 03Download the black-and-white PNG.
Frequently asked questions
Are my images uploaded?
No. The conversion runs in your browser on a canvas, so your image never leaves your device.
How is the grayscale calculated?
Each pixel uses a luminance-weighted formula (about 30% red, 59% green, 11% blue) that matches how the eye perceives brightness, for a natural-looking result.