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Image Tools

Normalize Image Colours

Stretch each colour channel to the full range, fixing flat contrast and colour casts.

or drag it here

image/* · up to 40 MB

Ignore this share of extreme pixels so one stray highlight does not defeat the adjustment.

Processed in your browser

Fill in the form and press “Normalize” to see the result here.

How to use it

  1. 1Select your image, or drag and drop it onto the upload area.
  2. 2Adjust the options if you need something other than the defaults.
  3. 3Press the button. The image is processed on your device - nothing is uploaded.
  4. 4Download the result, or drop in another file to do it again.

About the Normalize Image Colours

Each of the red, green and blue channels is stretched independently to fill the range from 0 to 255. Because the channels move separately, this also removes a colour cast.

On a deliberately monochrome or heavily toned image that independence works against you - it will pull the image back towards neutral. Auto contrast is the safer choice there.

Scans and photographs through glass are the classic candidates: both come out flat because nothing in the frame is truly black or truly white.

Questions people ask

Is your image uploaded to a server?

No. This tool runs entirely in your browser using standard web APIs, so your image never leaves your device. You can confirm it by opening your browser's network panel while the tool runs, or by disconnecting from the internet after the page has loaded.

Is it free, and do I need an account?

Yes, it is free, and there is no account, no sign-up and no watermark on the result. The project is funded by optional donations.