About the PNG Image Compressor
PNG files are lossless, which is great for quality but often results in large files, especially for screenshots and graphics with gradients. The PNG Image Compressor uses color quantization, the same technique used by popular tools like TinyPNG, to reduce the number of colors in your image to a carefully chosen palette. The result is usually 50–80% smaller while looking nearly identical, and transparency is fully preserved.
Use the color quality slider to control the palette size: higher values keep more colors and subtle gradients, lower values give the smallest files. Setting it to 100% keeps the image lossless and only optimizes the PNG encoding. You can compress many PNGs at once and download them as a ZIP, all processed privately in your browser.
When PNG compression helps most
- Screenshots of apps and websites often shrink by 60–80%, because they use a limited set of colours.
- Logos and icons keep their transparent background, which is why PNG is used for them.
- Charts and diagrams with flat colours compress very well.
When PNG is the wrong format
A large photo saved as PNG can stay big even after compression, because photos contain millions of colours. If the photo does not need transparency, convert it to JPG or WEBP instead, for example with PNG to JPG. The file is often 5–10 times smaller.
What the quality slider does
It sets how many colours are kept. High values keep smooth gradients and shadows. Lower values make the file smaller but can create visible bands in gradients. For simple logos and screenshots, a lower value usually looks identical.
Tip: zoom in on soft shadows and gradient buttons after compressing. If you see steps in the colour, move the slider up a little.
How to use the PNG Image Compressor
- Drop one or more PNG images into the upload area.
- Choose a compression level (Balanced is recommended) and, optionally, a maximum width.
- Use the Compare slider to check that the compressed image still looks sharp.
- Download images one by one or all together as a ZIP.
Frequently asked questions
Will my PNG keep its transparent background?
Yes. The compressor keeps the alpha channel, so transparent and semi-transparent areas stay intact.
Why is my compressed PNG still large?
Photos stored as PNG compress poorly. Convert them to JPG or WEBP with our PNG to JPG or PNG to WEBP converters for much smaller files.
What does color quality mean?
It controls how many colors are kept in the palette. 100% is lossless; around 60% gives a 256-color palette that looks great for most graphics and screenshots.
