Black & White Image Converter Online
Convert color photos to black and white online for free. Four grayscale methods: luminance, average, lightness, custom. No upload.
Drop an image here or click to upload
Supports JPG, PNG, WebP, GIF, BMP, SVG
Convert color images to black and white (grayscale) in your browser. Drop in a JPG or PNG and get a grayscale version instantly.
How to use Black & White Image Converter Online
- Upload or drag an image into the tool.
- The conversion happens automatically.
- Download the grayscale image.
Features
- Uses weighted luminance formula for natural contrast (0.299R + 0.587G + 0.114B).
- Supports JPG, PNG, and WebP.
- No upload — runs entirely in the browser.
- Download in original format.
FAQ
How do I convert an image to black and white?
Upload your image (JPG, PNG, WebP), choose a conversion method (Luminance recommended), and click Convert. Download the result instantly.
What is the difference between conversion methods?
Luminance uses human eye perception weights. Average takes mean of RGB values. Desaturate converts HSL saturation to 0. Threshold creates pure black/white based on cutoff.
Will I lose image quality?
The black and white conversion removes color information but preserves resolution. Download in high quality PNG format.
Are my images uploaded to a server?
No. All processing happens locally in your browser. Your images never leave your device.