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Tool guide
Black and white here means exactly two colours rather than shades of grey: every pixel becomes either black or white. Such an image is needed for stencils, laser engraving, thermal printing, screen printing and embroidery, where halftones physically do not exist. The key control is the threshold, which decides what brightness counts as black. Floyd-Steinberg dithering fakes halftones with a spray of dots, the way newsprint does. The image is processed by the page script and never uploaded. See also: a softer conversion to grayscale, flip the picture into a negative, turn the picture into ASCII art.
In greyscale a pixel can hold any of 256 brightness levels and the photo looks normal, just without colour. Here only two values remain, 0 and 255. If you want a desaturated photo rather than a two-tone image, use the greyscale converter instead.
Start at 128 and watch the preview. Dark images need a higher threshold or almost everything turns black; bright images need a lower one. There is no universal value because the right threshold depends on the exposure of the specific image, which is why the slider recalculates instantly.
Dithering spreads the rounding error onto neighbouring pixels, so grey areas become a pattern of black and white dots of varying density rather than a solid blob. On photographs it keeps faces and volume recognisable. Turn it off for logos, text and drawings, where clean edges matter.
JPG is lossy and produces grey fringing and artefacts around hard black-and-white edges, which is exactly where a two-tone image lives. PNG is lossless, and such an image stays small anyway because it contains only two colours.
Yes, that is one of the main uses: an engraver either burns a dot or does not, with no halftones available. Enable dithering for photographs and disable it for logos and lettering. Inversion often helps when the material is dark and the engraving is light.
No. The image is read by the browser, processed on a canvas and saved back on your device. Not a single byte travels over the network, which you can verify in the Network tab of developer tools.
Before: A greyscale logo
After: Threshold 128 with no dithering — clean outlines ready for cutting
Before: A photograph with soft shadows
After: Threshold 140 with dithering — halftones rendered as dots
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