What is the difference between lossless and quantized PNG compression?
Lossless mode strips non-critical metadata and packs pixel streams with 0% visual loss. Quantization reduces palette colors for massive 60%+ size savings.
線上PNG壓縮 — 無損壓縮PNG檔案大小並保留透明通道
Reduce PNG file sizes via smart color quantization and lossless deflation.
Drop PNG images here to compress
Reduce PNG file size with lossless packing or smart quantization
圖片預覽
如何使用 PNG圖像壓縮
1
選擇並上傳
Upload your PNG images into the optimization stage.
2
配置和預覽
Select Lossless Mode (zero visual change) or Smart Quantization (256/128 colors).
3
處理和下載
Click 'Compress PNG' to download your optimized, lightweight PNG files.
技術架構與客戶端隱私
Processing Engine
Browser Canvas 2D & Binary Transcoder
Privacy Model
100% In-Memory Sandbox · Zero Server Uploads
Format Standards
PNG, JPEG, WebP, SVG, ICO Specifications
Execution Speed
Zero Network Latency · Instant Local Output
Frequently Asked Questions
Is transparency preserved during PNG compression?
Yes. Transparent pixels and alpha gradients remain intact in both compression modes.
Are there watermarks or upload limits?
Never. PDFUtils and IMGUtils are 100% free with zero watermarks and zero limits.