Handitab

Image Dithering

Convert an image to pure black and white dots with Floyd-Steinberg dithering, set the maximum width, and download the 1-bit style PNG.

About Image Dithering

Dithering simulates shades of gray using only black and white pixels. This tool scales the image so its longest side fits the limit you set (600 pixels by default), converts it to grayscale, then applies Floyd-Steinberg error diffusion: each pixel is rounded to black or white and the rounding error is spread to four neighbors in 7/16, 3/16, 5/16, and 1/16 parts. Output is always PNG.

How to use Image Dithering

  1. Choose an image, or drag it onto the upload area. The file is read by your browser and is not uploaded.
  2. Set "Maximum width". The preview updates as you change them.
  3. Check the preview, then press "Download result" to save the file.

Questions about Image Dithering

Why is the dithered image always saved as PNG?

The effect depends on every pixel being exactly black or white. Lossy formats such as JPG smear those dots into gray and add artifacts, so the tool saves a lossless PNG to keep the pattern intact.

Why does the dithered image look smaller than my original?

The image is scaled down so its longest side is at most the pixel limit you set, 600 by default. Raise the limit for a finer dot pattern. Images already smaller than the limit are not enlarged.

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