Does Posterize Image upload my file or text to Tool-You servers?

No. Posterize Image runs in this browser tab. Files stay on the device. Limit note: 2–8 levels per RGB channel. PNG. First GIF frame only. Max 20 MB.

Should I use Threshold Image instead of Posterize Image?

Use Posterize Image when you need Reduce each channel to a few steps. Use Threshold Image when you need Turn a photo into black and white. They share a category (Images) but not the same job.

Posterize Image

Reduce each channel to a few steps.

Maps RGB onto 2–8 levels per channel. Unlike Threshold this is not a single luma cutoff. Unlike Pixelate this keeps resolution. PNG out. First GIF frame only.

What Posterize Image does

Maps RGB onto 2–8 levels per channel. Unlike Threshold this is not a single luma cutoff. Unlike Pixelate this keeps resolution. PNG out. First GIF frame only.

The interactive controls for Posterize Image load after this article so crawlers still read the instructions. Path /posterize-image is the canonical address. Work happens on this device; Tool-You does not take a copy of the file or pasted text for Posterize Image.

How to use Posterize Image

Stay on this Posterize Image page (/posterize-image). Do not switch to Threshold Image unless you actually want Turn a photo into black and white..
Add the file type Posterize Image accepts. Hint from the path: posterize image. Reduce each channel to a few steps.
Set only the options that match Posterize Image. Neighbor Pixelate Image does something else (Make a mosaic effect.). Tool note: Maps RGB onto 2–8 levels per channel. Unlike Threshold this is not a single luma cutoff. Unlike Pixelate this keeps resolution. PNG out. First GIF frame only.
Run Posterize Image in this tab. Browser memory still applies: 2–8 levels per RGB channel. PNG. First GIF frame only. Max 20 MB.
Download or copy the result from Posterize Image. If it is the wrong job, open Threshold Image instead.

When not to use Posterize Image

Skip Posterize Image when a neighbor tool matches better — start with Threshold Image or Pixelate Image — or when the description already warns the job will fail. In the tool’s own words: Maps RGB onto 2–8 levels per channel. Unlike Threshold this is not a single luma cutoff. Unlike Pixelate this keeps resolution. PNG out. First GIF frame only.

Questions about Posterize Image

What does Posterize Image do that other Images pages on this site do not?: Maps RGB onto 2–8 levels per channel. Unlike Threshold this is not a single luma cutoff. Unlike Pixelate this keeps resolution. PNG out. First GIF frame only. Short version: Reduce each channel to a few steps.
Does Posterize Image upload my file or text to Tool-You servers?: No. Posterize Image runs in this browser tab. Files stay on the device. Limit note: 2–8 levels per RGB channel. PNG. First GIF frame only. Max 20 MB.
Should I use Threshold Image instead of Posterize Image?: Use Posterize Image when you need Reduce each channel to a few steps. Use Threshold Image when you need Turn a photo into black and white. They share a category (Images) but not the same job.
What are the limits of Posterize Image?: 2–8 levels per RGB channel. PNG. First GIF frame only. Max 20 MB. Also: Maps RGB onto 2–8 levels per channel. Unlike Threshold this is not a single luma cutoff. Unlike Pixelate this keeps resolution. PNG out. First GIF frame only.