Online PNG Compressor
Lossless & Quantized PNG Shrinker
Reduce PNG file size by up to 80% without losing alpha transparency or edge clarity. 100% processed on your device with zero cloud uploads.
Drop Your Image Here to Compress
Supports PNG, JPEG, WebP, and AVIF. Up to 80% file size reduction with zero noticeable quality loss.
Optimized high-viewability unit compliant with Google AdSense Policies
The Science Behind High-Efficiency PNG Compression
Unlike JPEGs which discard spatial frequencies, Portable Network Graphics (PNG) was designed as a lossless bitmap format. However, when software like Photoshop, Canva, or Figma exports a 32-bit PNG, it includes 24 bits of unquantized color depth and extensive metadata headers, resulting in heavy 5MB–10MB files.
Our PNG Compressor uses intelligent color palette quantization (the exact algorithm popularized by TinyPNG and pngquant). By clustering similar pixel hues and applying Floyd-Steinberg error diffusion, we generate an 8-bit indexed palette that looks identical to human observers while shrinking file size by 65% to 80%.
8-Bit Alpha Transparency
Preserves soft gradients, drop shadows, and subtle feathering around complex hair cutouts and glass reflections without white jagged halo borders.
Client-Side Security
Your unreleased company logos, brand assets, and product prototypes never leave your device. All compression happens locally in browser memory.
Need to isolate subjects or remove backgrounds first?
Try our AI Background Remover for instant transparent cutouts.
PNG Compressor FAQs
How does PNG quantization reduce file size by up to 80%?▼
Standard 32-bit PNGs store up to 16.7 million colors. Most graphics only require several hundred colors. Our tool converts 24-bit RGB into an optimized 8-bit indexed palette with Floyd-Steinberg dithering. This reduces redundant bytes so DEFLATE compression can shrink the file size dramatically without visible quality loss.
Does this compressor preserve transparent backgrounds in PNGs?▼
Yes! Our color quantization algorithm specifically preserves 8-bit alpha channels, ensuring soft shadows, feathered edges, and transparent cutouts remain pixel-perfect.
Is there a difference between Smart Mode and Lossless Mode for PNG?▼
Smart Mode uses color quantization to achieve 65%–80% size savings with imperceptible degradation. Lossless Mode preserves 100% exact RGBA pixel data while optimizing chunk headers, achieving a 10%–20% size reduction.
Can I compress multiple PNG files at the same time?▼
Yes! You can switch to Batch Mode or visit our Image Compressor to process dozens of PNGs at once and download a single ZIP file.