Compress PNG Image Online Free

PNG (Portable Network Graphics) uses lossless compression, which means every single pixel is preserved exactly as the original. This is great for quality but produces files 5-10x larger than JPG for photographs. A single screenshot from a Retina display can easily be 4-8MB.

Our PNG compressor works by optimizing the internal compression algorithm, reducing the color palette where possible, and stripping unnecessary metadata (EXIF data, color profiles, timestamps). The result is a visually identical image at 30-70% of the original file size.

Use PNG when you need transparency (logos, icons, overlays), pixel-perfect accuracy (screenshots, text, diagrams), or are working with graphics that have sharp edges and solid colors.

Use JPG for photographs, real-world images, and any content where slight compression artifacts are acceptable. JPG files are typically 80% smaller than the same image saved as PNG.

Use WebP when targeting modern browsers. WebP supports both transparency and lossy compression, producing files 25-30% smaller than PNG with equivalent visual quality. Over 97% of browsers now support WebP.

PNG supports an alpha channel that defines the transparency level of each pixel from fully opaque to fully transparent, with 256 levels in between. This allows smooth, anti-aliased edges on logos and graphics placed over any background color.

Our compressor preserves the alpha channel completely. Every transparent, semi-transparent, and opaque pixel remains exactly as it was in the original file. This is critical for web designers, app developers, and anyone using PNG overlays.

The amount of compression depends on image content. Simple graphics with few colors (logos, icons, flat illustrations) compress 50-70%. Screenshots with text and UI elements compress 30-50%. Complex photographs saved as PNG compress 20-40%.

For the best results: if your PNG is a photograph, consider converting to JPG using our converter for even smaller files. If you need transparency, our PNG compressor gives you the smallest possible file while keeping every transparent pixel intact.