Convert an image to pure black and white locally - a hard cutoff, no dithering, format preserved. No upload.
Running locally on your device ...
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Your files never left your device
No. Everything runs in your browser - your file never leaves your device. How this is verifiable
Thresholding converts an image to pure black and white using a single hard cutoff: each pixel becomes black or white depending on whether its brightness is below or above the midpoint. Unlike dithering, there is no dot pattern - edges are clean and solid, the classic high-contrast line-art look.
A thresholded image is useful for line art, stencils, high-contrast logos, scanned text or a stark graphic style. The output keeps your original format and dimensions - a PNG stays a PNG (with transparency), a JPEG stays a JPEG.
Everything runs entirely locally in your browser on a canvas (no upload, even offline) - your image never leaves your device. Thresholding converts to greyscale first, so colour is discarded; for a softer, shaded black and white use dithering instead. Animated images are flattened to a single frame.
| Input formats | JPG, JPEG, PNG, WEBP |
|---|---|
| Output format | JPG |
| Batch processing | Yes |
| Processing | Locally in your browser (JavaScript) |
| File upload | None |
Limitations: Converts an image to pure 1-bit black and white with an adjustable threshold (default: midpoint 128; no error diffusion, so no dot pattern - clean hard edges). The original format and dimensions are preserved (PNG keeps transparency; JPEG flattens onto white). Colour is discarded. Animated inputs are reduced to a single frame.
No. The effect runs entirely locally in the browser on a canvas - even offline. Your image never leaves your device.
Thresholding uses one hard cutoff, giving clean solid black and white shapes. Dithering spreads the error into a dot pattern that simulates grey shades. Use the "Dither image" tool for that look.
No. The image is converted to greyscale before the cutoff, so the result is pure black and white.
Yes. A PNG stays a PNG (with transparency), a JPEG stays a JPEG, and the dimensions are unchanged.