Convert Image to Grayscale Online Free
Convert a colour photo into elegant black-and-white grayscale. The tool uses perceptual luminance weighting, so bright and dark areas keep their natural balance instead of looking flat — perfect for a classic monochrome look or a neutral background image.
Your files never leave your device. All processing happens locally in your browser.
Drag & drop your image here
or click to browse
Files never leave your device
Up to 50MB per file
Why use this tool
True-to-Eye Tones
Colours are mixed using Rec. 601 luma weights, matching how the human eye perceives brightness, so skin and skies convert naturally.
One Click
Just drop your image in — the grayscale version appears instantly, ready to download with nothing to configure.
100% Private
Files are processed entirely in your browser using the Canvas and WebAssembly APIs. Nothing is ever uploaded to a server.
Free Forever
No account, no watermark, no daily limits. Every tool on PixelResize is free to use as often as you like.
How to grayscale image
- 1
Upload a JPG, PNG or WebP image.
- 2
The tool converts it to grayscale automatically.
- 3
Compare the black-and-white preview.
- 4
Download your grayscale image.
Frequently asked questions
Related tools & sizes
How to Convert an Image to Grayscale the Right Way
Not all grayscale is equal. A naive colour average produces flat, muddy results — proper luminance weighting keeps a photo's natural depth. Here's the difference.