Quantize a JPEG
Reduce a JPEG's palette with advanced quantization controls. Runs entirely in your browser, so your data never leaves your device.
Drop a file here, or click to browse
Files never leave your device
Output
The result appears here as you type.
How to use Quantize a JPEG
- 1. Upload your JPEG. Drop a JPEG photo into the input pane. The tool analyzes its colors to find the smaller set that best represents the whole image.
- 2. Choose the palette size. Move Palette size to set how many distinct colors remain, such as 16 for a bold poster look or a higher count to stay closer to the original photo.
- 3. Decide on dithering. Toggle Floyd-Steinberg dithering to scatter small error patterns between pixels, which smooths color banding at the cost of a slightly grainy texture compared to flat quantization.
- 4. Download the quantized JPEG. Click process and download the result. Compare it to the source to judge whether the reduced palette and dithering settings hit the look you were after.
When to use Quantize a JPEG
Quantize a JPEG reduces the number of distinct colors in a photo down to a chosen palette size, with optional dithering to soften the transition. Use it whenever you want a stylized, limited-color look, or want to see how a photo degrades under color reduction.
- Retro poster or game-art style. A photo gets reduced to 16 colors with dithering enabled to mimic the look of an old console game or a screen-printed poster, rather than a smooth continuous-tone photograph.
- Testing palette limits before export. You are deciding how few colors a photo can use before it looks obviously degraded, so you step the Palette size down and compare each result before settling on a value.
- Comparing dithered versus flat reduction. The same low palette size produces visible color banding when Floyd-Steinberg dithering is off, and a smoother, grainier gradient when it is turned on, so you toggle it to compare.
Examples
16-color poster look
Input
photo.jpg + 16 colors + dithering
Output
photo.jpg repainted with its 16 most representative colors
About the Quantize a JPEG tool
Quantize a JPEG does its work locally, right in the browser. Reduce a JPEG's palette with advanced quantization controls. There is no upload step, no queue and no account, and your data never travels over the network.
It belongs to the JPG Tools collection on EditSafely, a set of 145 small, focused JPG utilities that share the same instant, private workspace.
You can shape the output with 2 settings, including Palette size and Floyd–Steinberg dithering, and the result refreshes the moment you change one. The finished file is put together in browser memory and saved with the Download button, so it never touches a server on the way to your disk. A worked example further down the page shows exactly what the tool produces for a real input.
Running locally also makes the tool fast and dependable: results appear as you type or drop a file, there is no server outage that can take it down mid-task, and confidential data can be processed without a second thought.
Frequently asked questions
Is Quantize a JPEG free to use?
Yes, it is completely free. All 2,658 tools on EditSafely work without an account, a subscription or usage limits.
Are my files uploaded to a server?
Everything happens locally. Your browser downloads the tool's code once, then does all the processing itself; nothing you enter is transmitted, stored or logged. You can even go offline after the page loads and it will still work.
Which files does Quantize a JPEG accept?
It accepts JPG and JPEG photos. There is no file size cap imposed by a server; very large files are limited only by your device's memory.
Do I need to sign up or install anything?
No. The tool works in any modern browser on desktop, tablet or phone. There is no account to create, no extension to add and no software to install.
How do I save the output?
Click the Download button once the result is ready. The file is built in your browser's memory and handed straight to your downloads folder, without passing through a server.