About Posterize
Posterize is a free, fast and reliable online tool. Reduce the number of colors. Everything runs locally in your browser — no files are uploaded and no data is stored, keeping your information completely private. It works responsively on both desktop and mobile devices.
How to use Posterize
- 1 Click "Choose an image" and upload your file
- 2 Adjust Levels as needed
- 3 Click "Convert" to process the image
- 4 Click "Download" to save the result
Frequently asked questions
How do I use Posterize?
Adjust Levels and the result is generated instantly in your browser.
Is Posterize free to use?
Yes — Posterize is a free online tool. No sign-up or login is required, and there are no hidden charges or usage limits.
Do I need to create an account to use Posterize?
No. Posterize runs entirely online in your browser — there is no account to create, no login, and nothing to install.
Does Posterize upload my data?
No. Everything runs locally in your browser. Your input never leaves your device, is never stored, and is never tracked, so it stays private.
Free, online, and private
Free to use
Posterize is completely free. There is no account to create, no login, and no hidden charge or usage limit.
Runs online in your browser
It is a free online tool that runs entirely in your browser. Nothing to download or install — open the page and start using it right away.
Your data stays private
All processing happens locally on your device. Your input is never uploaded, stored, or tracked, so it never leaves your browser.