How it works
Upload an image, choose grayscale or high-contrast black & white, and the tool recalculates every pixel's brightness using standard luminance weighting (the same approach most photo software uses) before downloading the result.
Grayscale / Black & White
Convert a color photo to grayscale or true black and white — no sign-up, no upload, no file size limit.
Drop an image here, or click to browse
Your files never leave your device. Everything runs locally in your browser — nothing is uploaded to a server, so there's no file size limit, no subscription, and no one but you ever sees what's in your file.
Frequently asked questions
What's the difference between grayscale and black & white mode?+
Grayscale keeps the full range of tones from black to white, just with color removed — this is what most people mean by a "black and white photo." Black & white (high contrast) mode pushes every pixel to pure black or pure white based on a brightness threshold, giving a stark, poster-like look.
What does the threshold slider do?+
Only shown in black & white mode — pixels brighter than the threshold become pure white, everything else becomes pure black. Raising it makes more of the image turn black; lowering it makes more turn white.
Does this affect the image's dimensions or format?+
No — only the colors change. Dimensions and file format stay the same as the original.
Is my image uploaded anywhere?+
No. This tool runs entirely in your browser using JavaScript — your image is read, converted, and downloaded without ever being sent to a server.
Keep a backup of your original file. This tool processes everything locally in your browser, and we've tested it carefully — but no conversion tool handles every PDF perfectly. Always keep your original file and double-check important results before relying on them.