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Image Posterizer
Reduce a photo to a few flat colour levels for a bold poster look.
Posterize an image
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How to use the Image Posterizer
- Choose the photo you want to posterize from your device.
- Set the number of levels until you get the flat look you want.
- Click Download to save the posterized image as a PNG file.
Features
- Two to sixteen colour levels per channel
- Reduces gradients to flat colour bands
- Live preview as you move the slider
- Ideal for posters, stencils and pop art
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Frequently Asked Questions
Common questions about the free online image posterizer.
Choose your photo, move the levels slider down until the colours break into flat bands, then
click Download to save the PNG.
No. The pixels are quantised on a canvas inside your browser, so your image never leaves your
own device.
It reduces the number of possible values in each colour channel, so smooth gradients become a
small set of flat colour bands.
Five or six levels give a clear poster effect while keeping the subject recognisable. Two or
three levels produce very graphic results.
Posterizing keeps several shades per channel and stays in colour, while threshold reduces
everything to just pure black and pure white.
The PNG file often becomes much smaller because large areas share the same flat colour, but
the pixel dimensions never change.
Yes. Flat colour bands are much easier to separate into print layers than continuous tones,
which is why posterizing suits stencils and screen prints.
Yes. The tool is fully responsive and the levels slider works with touch on phones and
tablets as well as with a mouse.
Yes. It is completely free and unlimited, with no account, no sign-up and no watermark on
your downloaded image.
Last updated: October 10, 2026