CompressPowerImage Compressor
PNG Compressor
Optimize PNG images by reducing file size without quality loss. Upload up to 5 PNG files, each up to 1GB, for fast server-based compression.
Drag & drop files here
or Browse Files
Compression Mode
Frequently Asked Questions
- Is PNG compression lossless?
It depends on the quality value. At 100 the file is only recompressed, pixel for pixel identical. Below 100 the palette is quantized, which is where the real size drop comes from.
- How is the output chosen?
Three encodings run for every image: a lossless recompress, a quantized palette with dithering, and an aggressive palette capped at 64 to 256 colours depending on quality. The smallest of the three wins.
- Is transparency preserved?
Yes. The alpha channel survives quantization, so logos and screenshots with transparent backgrounds stay transparent.
- What happens to my file after processing?
It is uploaded over HTTPS, processed, and deleted 24 hours later by an automatic storage rule. Files are never used for anything other than your own conversion.
- What are the size limits?
Free: 100 MB per file and 5 files at a time, 8 conversions a day without an account and 20 when signed in. Premium: 500 MB and 20 files. Pro: 1 GB and 50 files.