Compress PNG Online Free
Crush PNG sizes. Keep the quality.
100% Free
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How It Works
1
Upload your PNG Drag and drop or click to browse. Transparent PNGs work great.
2
Choose compression mode Lossy for maximum compression (recommended for web). Lossless to keep every pixel identical.
3
Download optimized PNG Your smaller PNG with transparency preserved.
Why Compress PNG?
PNG files can get surprisingly large, especially for detailed graphics or photos with transparency. Standard PNG uses lossless compression, which preserves every pixel but limits how small files can get.
Our compressor offers two modes. Lossless optimization re-compresses the PNG more efficiently without changing any pixels—typically saves 10-30%. Lossy compression reduces the color palette and applies quantization, achieving 50-70% size reduction with minimal visible difference.
Transparency is fully preserved in both modes. Your transparent backgrounds, soft edges, and alpha gradients stay intact.
Frequently Asked Questions
For most web use: lossy. The quality difference is imperceptible at 80% quality, and you'll get much smaller files. Use lossless only when you need bit-for-bit identical output, like for pixel art or technical diagrams where every pixel matters.
No. Both lossy and lossless modes preserve the full alpha channel. Your transparent areas stay transparent, and semi-transparent pixels (like soft drop shadows) keep their exact opacity values.
It reduces the color palette (quantization) and applies dithering to simulate colors that were removed. For most images, 256 colors is enough to look perfect. The result is still a valid PNG file that works everywhere.
If it's already optimized, probably not much. Try lossy mode if you haven't—it can often squeeze out another 30-50%. But there's a floor to how small PNGs can get. For truly minimal sizes, consider WebP or AVIF.