Optimize PNG files without quality loss
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Select a PNG file to compress
Optimize PNG files with lossless compression using UPNG.js and pako. Reduce file size by 40-70% without any quality loss - every pixel remains identical. Perfect for logos, graphics, and screenshots where quality cannot be compromised.
Uses advanced DEFLATE algorithms (UPNG.js + pako) for maximum compression with zero quality degradation. Every pixel is preserved exactly.
Typical savings of 40-70% on unoptimized PNGs. Poorly optimized exports from design tools can compress even more.
Higher levels produce smaller files but take longer. Level 70 is ideal balance - aggressive compression without excessive processing time.
Alpha channels are maintained perfectly. Ideal for logos, icons, and graphics with transparent backgrounds.
All optimization happens locally in your browser. No uploads, no servers, complete privacy.
PNG compression is performed entirely client-side using UPNG.js and pako libraries. Your images never leave your device - all processing is local. We have zero access to your files.
Lossless compression reduces file size without removing any data. The decompressed image is pixel-for-pixel identical to the original. Unlike lossy JPG compression, no quality is sacrificed.
Varies widely. Unoptimized PNGs from Photoshop/design tools: 40-70% savings. Already optimized PNGs: 5-20% savings. Screenshots and simple graphics compress better than photos.
Level 70 recommended - aggressive compression without excessive processing time. Level 256 (maximum) produces smallest files but is much slower. Lower levels (30-50) are faster with slightly larger files.
Yes, but diminishing returns. First optimization gives biggest savings. Re-compressing an already optimized PNG yields minimal additional savings (usually <5%).
PNG offers universal compatibility and lossless quality. Use PNG when you need perfect quality and transparency across all platforms. Use WebP/AVIF for smaller lossy files on modern browsers.
No. Alpha channel transparency is preserved perfectly. Compression optimizes how color and alpha data is stored without changing pixel values.