Posterize an image locally - a few flat colour bands for a poster look, 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
Posterizing reduces the number of tonal levels per colour channel, so smooth gradients collapse into a few flat bands. The result is the bold silk-screen or pop-art poster look. The number of levels can be set with a slider (default: 5 levels), giving a clear banded effect on any image.
A posterized image is useful for a graphic poster style, a retro or screen-print look, simplifying a photo into flat areas, or a base for further illustration. 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. Posterizing discards subtle gradients by design in favour of flat bands, so fine shading is lost. 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: Reduces each colour channel to an adjustable number of levels (default: 5, range 2 to 16), turning gradients into flat bands. The original format and dimensions are preserved (PNG keeps transparency; JPEG flattens onto white). Subtle shading is lost by design. 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.
It cuts the number of brightness levels per colour channel, so smooth gradients become a few flat bands - the classic poster or pop-art look.
5 levels by default; use the slider to set 2 to 16 levels so the banding looks exactly the way you want.
Yes. A PNG stays a PNG (with transparency), a JPEG stays a JPEG, and the dimensions are unchanged.