Threshold

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Convert your image to pure black and white based on a brightness or channel threshold. Pixels above the threshold become white, below become black.

How to use Threshold

  1. Upload your image using drag & drop or click to browse.
  2. Adjust the settings using the controls above.
  3. See the result instantly — processing happens in your browser.
  4. Download your processed image as a PNG file.

About Threshold

Convert your image to pure black and white based on a brightness or channel threshold. Pixels above the threshold become white, below become black. This tool is part of ImageToolbox's collection of free online image tools. It runs entirely in your browser — your images are never uploaded to our servers.