Image threshold (B&W)

Binarize an image with a fixed threshold, Otsu's automatic level, or adaptive local-mean thresholding.

The image stays in this browser. Nothing is uploaded or stored.

PNG, JPG, or WebP up to 25 MiB. Output is always a PNG. Adaptive mode uses a local mean — good for uneven lighting, not a replacement for deskewing.

How to use

  1. Choose an image.
  2. Pick the method and settings.
  3. Download the black & white PNG.

What it supports

PNG/JPG/WebP up to 25 MiB and 40 MP; output is always a PNG. Adaptive mode compares each pixel to its local mean — good for uneven lighting, not a deskew or OCR step.

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