Flatten a photo to a handful of tones for a screen-print / poster look — levels, gamma and dithering, previewed live on your device.
Posterized on your device — nothing is uploaded
No size limit · files are processed on your device and never uploaded · how it works
Runs in your browser. Files are never uploaded — you can go offline after the page loads.
How to use the Posterize Image
Drop a photo — the editor opens automatically.
Set the number of levels, gamma and options.
Download a full-resolution PNG or JPG.
Easy to use
Drop files, pick options, download. Whole folders at once, no signup, no daily limit.
Best quality
The same engines the professionals use — SVGO, resvg, MozJPEG, libwebp, libavif — compiled to run in your browser.
Private & secure
Files are processed on your device and never uploaded. Close the tab and nothing remains anywhere.
The screen-print poster look, in a click
Posterizing collapses a photo's smooth gradients into a few flat tones — the bold, graphic look of vintage posters
and screen prints. Drop the levels for a stark two- or three-tone effect, or keep more for a subtler cutback. Gamma
shifts where the bands fall, and ordered dithering breaks up hard edges when you want a softer transition.
Everything renders live on a canvas in your browser and exports at full resolution — no upload, no watermark. For a
two-colour version try the duotone effect, or go all the way to
ASCII art.
Frequently asked questions
What does posterizing do?
It reduces the number of tones in each colour channel, replacing smooth gradients with flat bands — the classic screen-print or propaganda-poster look.
Is my photo uploaded?
No — the effect is computed on a canvas in your browser at full resolution.
Most online converters upload your file to a server. InfyTool ships the actual encoders to your browser as WebAssembly instead, so processing happens inside your tab — faster for batches, and nothing to delete afterwards.
No upload, ever. Turn off Wi-Fi after the page loads and every tool keeps working.
No limits. No file-size cap, no queue, no watermark, no account.
Runs on your CPU. Batches use several cores in parallel; nothing is throttled.