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Grayscale Image

Convert a colour image to black and white with one click

🔒Files auto-deleted in 1 hour🛡HTTPS encrypted⚡Fast processing🆓100% free, no signup

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Drop your image here

or click to browse from your computer

JPG, PNG, WebP · Max 20 MB · Output is grayscale.jpg

Frequently Asked Questions

What colour algorithm is used?

We use the luminosity method — a weighted average of RGB channels (0.21R + 0.72G + 0.07B) that matches how the human eye perceives brightness. This gives more natural-looking results than simple averaging.

Can I convert back to colour?

No — colour information is discarded when converting to grayscale. The process is irreversible.

What is the output format?

The output is a JPG file. PNG output is planned.

Are my files kept private?

Yes. Files are sent over HTTPS and deleted within 1 hour.