Threshold

Open in Editor

Convert your image to pure black and white based on a brightness 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 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.