Image Color Quantizer
Image Tools · Free Online Tool
Reduce image color depth (e.g. to 256 colors).
Per-channel Quantization
Reduces each RGB channel to a fixed number of levels.
Live Palette
Displays a sample of the resulting colors.
Posterize Effect
Creates a stylized posterized look on any photo.
How to Use Image Color Quantizer
- 1Upload your image file or drag and drop it into the tool.
- 2Adjust the tool-specific settings (quality, size, format, etc.).
- 3Click the process button to apply changes.
- 4Download the processed image.
Features
- ✓100% free — no signup, no subscription, no ads
- ✓Runs entirely in your browser — data never leaves your device
- ✓Fast and lightweight — instant results
- ✓Cross-platform — works on desktop, tablet, and mobile
Frequently Asked Questions
Are my images uploaded to a server?
No. All image processing happens locally in your browser using canvas and WebGL APIs. Your images never leave your device.
What image formats are supported?
We support JPEG, PNG, WebP, ICO, and BMP formats depending on the tool. See the tool description for specifics.
Is there a file size limit?
Images up to 20MB are typically supported. Larger files may cause performance issues on some devices.
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Learn the concept
Learn the concept
Understand the programming ideas behind this tool.