Select up to 20 PNG images from your device, or drag files to the drop area. Click COMPRESS to start. All processing happens in your browser — your files never leave your device.

    Click on a thumbnail to adjust quality. Download individually or all at once.

      Drop Your Files Here

      Before: 0 KB

      After: 0 KB (-0%)

      PNG Compression: Complete Guide

      PNG compression works differently from JPEG. Instead of removing visual detail, it reduces the number of colors in your image using advanced quantization algorithms. This can dramatically shrink file sizes—often by 70% or more—while preserving the crisp edges and transparency that make PNG ideal for graphics.

      Key Fact: A 24-bit PNG with millions of colors can often be reduced to 256 colors (8-bit) with no visible difference, resulting in files 70-80% smaller.

      Why Compress PNG Images?

      PNG files are essential for graphics, logos, icons, and any image requiring transparency. But they can be surprisingly large:

      The File Size Problem

      A single PNG icon can be several hundred KB. A page with multiple PNG graphics can load slowly, especially on mobile connections. Large PNGs also consume more bandwidth and storage.

      Why PNG Gets Big

      PNG-24 format supports over 16 million colors—far more than most graphics actually need. A logo with 10 distinct colors stored as PNG-24 wastes massive amounts of data encoding color information that isn't used.

      Pro Tip: Most logos, icons, and UI graphics look identical at 256 colors or less. Photographs and complex gradients may show banding at low color counts.

      How PNG Compression Works

      Our tool uses color quantization to reduce the color palette while maintaining visual quality:

      1. Analyzes all colors in your image
      2. Groups similar colors together using perceptual algorithms
      3. Creates an optimized palette with the target number of colors
      4. Remaps pixels to the nearest palette color
      5. Applies additional lossless compression to the result

      The algorithm prioritizes colors that the human eye is most sensitive to, ensuring the compressed image looks as close to the original as possible.

      Important: Unlike JPEG compression, PNG color reduction can cause visible banding in smooth gradients. If your image has gradients, use the preview to check results before downloading.

      Choosing the Right Color Count

      Colors Best For File Size
      256 Most graphics, logos, icons, screenshots ~70-80% smaller
      128 Simple graphics with few colors ~80-85% smaller
      64 Icons, simple illustrations ~85-90% smaller
      16-32 Minimalist graphics, favicons ~90%+ smaller

      Start with 256 colors—it's the sweet spot for most images. Only reduce further if you need maximum compression and your image can handle it.

      How to Use This Tool

      1. Add files — Drag and drop or select up to 20 PNG images
      2. Compress — Click COMPRESS to process with automatic settings
      3. Adjust (optional) — Click any thumbnail to manually set the color count
      4. Compare — Use the before/after comparison to check quality
      5. Download — Save individual files or download all at once

      Typical Results

      Website logo (150KB): Compressed to ~25KB at 256 colors — 83% reduction

      UI screenshot (800KB): Compressed to ~200KB at 256 colors — 75% reduction

      Icon set (50KB each): Compressed to ~8KB each at 64 colors — 84% reduction

      Transparency Preservation

      Unlike some compression tools, ours fully preserves PNG transparency. Alpha channel information is maintained throughout the compression process, so your graphics with transparent backgrounds stay perfectly usable.

      Privacy and Security

      All processing happens in your browser using WebAssembly:

      • No uploads — your files never leave your device
      • No servers — compression runs locally
      • No tracking — we can't see your images
      • Originals preserved — only downloads are compressed