Free Online PNG Compress Tool

Free online PNG Compress: PNG color quantization compression. No software installation, works right in your browser, completely free.

How PNG Compress Works

PNG Compress reduces PNG file size using color quantization — the number of colors in the image is intelligently reduced while keeping the result looking clean. It is the standard technique for shrinking logos, screenshots and UI assets without switching formats.

Color quantization shrinks PNGs while preserving alpha transparency
256-color preset keeps quality, lower counts squeeze size further
Live size estimate for every file before you commit
  1. Upload one or more PNG files.
  2. Choose the color count — 256 colors (recommended) keeps quality while cutting size significantly.
  3. Check the live estimate for each file.
  4. Click “Start Compressing” and download the results.

Typical Use Cases

Optimize UI assets

Compress app icons and interface PNGs so your app or website ships smaller.

Trim screenshot sizes

Shrink large screenshots for documentation and slide decks without visible damage.

Prepare storefront graphics

Reduce banner and logo PNGs for e-commerce listings that enforce size limits.

PNG compression shines on graphics with flat colors: logos, icons, screenshots and banners. Photos compress better as JPEG or WebP. The color count directly trades size against quality, so start with 256 and only drop lower when the estimate matters more than subtle gradients.

FAQ

Does this support transparency?

Yes. Alpha transparency is preserved, which is why PNG stays the right format for logos and overlays even after compression.

Why is my PNG bigger than a JPEG of the same image?

PNG is a lossless format designed for graphics, not photos. For photographic content, convert to JPEG or WebP instead to get much smaller files.

Is PNG Compress free?

Completely free. All tools on this site are free to use — no sign-up and no usage limits. Ads shown on the site help cover server and development costs.

Are my files safe?

Yes. Files are processed entirely in your browser and never uploaded to any server. Data is cleared when you close the page.

Will conversion reduce image quality?

Conversion uses high-quality encoding — differences are nearly invisible. Formats like WebP can even shrink file size while keeping quality.

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