Free PNG compression with smart quality-size balance and real-time preview
All image processing is done locally in your browser via WebAssembly, ensuring privacy. Smart compression balances quality and size, supports batch processing, before/after comparison, and one-click download. Optimizes image loading and transfer efficiency for SEO, social media, email, and more.
What is PNG?
PNG (Portable Network Graphics) is a lossless image format supporting transparency, indexed color, and true color. Widely used for icons, logos, UI design, and transparent assets requiring pixel-perfect preservation.
Why compress PNG?
PNG files are often large, slowing page loading and consuming storage and data. Proper compression significantly reduces file size while preserving transparency and clarity, improving load speeds and meeting platform upload limits.
How does PNG compression work?
PNG supports both lossless and lossy compression. Lossless compression reduces size through data optimization, palette reduction, and filtering algorithms without losing any pixels. Lossy compression can moderately reduce color count and optimize channel data for higher compression ratios while preserving transparency with no visible difference.
Choose Quality Level?
Use Case Quality Level Compression Ratio Notes HD transparent assets, UI design, logos 90-100 10-30% Lossless/near-lossless, preserves transparency edges and detail Web icons, transparent images, general use 75-89 40-60% Smaller size, transparency intact, no visible quality loss Thumbnails, previews, small icons 60-74 60-80% High compression, fully usable for small images Extreme compression, non-HD display Below 60 80%+ Minimal size, suitable for low-priority display Privacy & Security?
No registration required. All processing is done locally in your browser via WebAssembly. Images are never uploaded to the cloud, collected, or stored. Your privacy is fully protected.
How to Use?
1Adjust QualityAuto by default, or set a custom quality value2Add FilesSelect, select all, or drag and drop to compress3DoneClick thumbnails to compare before/after4SaveSave individual images or download all