Convert Image to Grayscale (Black & White)
Convert color photos into clean black and white grayscale images instantly in your browser.
- 100% free
- Files stay on your device
- No sign-up, no watermark
Choose files or drag & drop
Upload PNG, JPG, JPEG, WEBP, BMP files to convert locally inside your browser.
What is Image to Grayscale (Black & White) converter?
Convert portraits, landscapes, and documents to black and white. Our client-side grayscale engine applies the human eye’s perceptual luminance weights (0.2126 Red + 0.7152 Green + 0.0722 Blue) for rich tonal depth.
How to use Image to Grayscale (Black & White) converter
- 1
Add your file or input
Choose a supported file, drag it onto the upload area, or type/paste the data this tool works with.
- 2
Adjust the options
Pick the output format, quality, size or other settings the tool offers. Defaults work well for most files.
- 3
Process and download
Run the tool and save the result. Processing happens in your browser, so nothing is uploaded to a server.
Frequently asked questions
Why are weighted coefficients used instead of averaging R, G, and B?
Human eyes are far more sensitive to green wavelengths than red or blue. Weighted ITU-R BT.709 formulas match human perception, producing realistic depth rather than flat, muddy gray tones.
Does converting a photo to grayscale reduce file size?
Yes! When saved as a grayscale JPEG or PNG with an 8-bit single-channel palette, file sizes typically drop by 30% to 50% compared to 24-bit color equivalents.
Can I convert black and white back to color?
No. Grayscale conversion permanently discards chromatic hue data. Always retain your original color file if you might need it later.
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