Reduce the number of colours in a photo for a bold, graphic poster look. Free, runs offline.
How to use Posterize Image
- Open the toolNo signup and nothing to install; it works as soon as the page loads.
- Set “Colour levels”
- Read the resultChange any input and the result is recalculated immediately.
Nothing you enter leaves your device
All of the work happens inside your browser. Whatever you type is never packaged up and sent to a server, and no request this page makes carries it.
That makes it safe for contract amounts, personal details and internal documents you would rather not hand to a third party — close the tab and it is gone.
What this tool does not do
Posterize Image only does what a browser can do on its own — it talks to no backend service. So it keeps no history for you and syncs nothing across devices; if you need a record, copy or download the result.
It is also not a substitute for professional judgement. For legal, medical or tax decisions, treat the output as a starting point rather than a final answer.
Frequently Asked Questions
- What does posterize mean?
- It snaps each colour channel to a few set levels, so smooth gradients become flat bands.
- Fewer levels or more?
- Fewer levels gives a stronger, more graphic poster effect; more keeps the photo closer to the original.