Compress PNG
Optimize PNG images with safe lossless compression or aggressive size reduction.
ここにPNG imageをドロップ
またはコンピュータやスマートフォンのファイルを参照
How to use Compress PNG
Select or drop a PNG file into the workspace.
Choose lossless optimization or a quality slider for lossy WebP output.
Click 'Compress PNG' to process the image locally.
Download the smaller PNG or WebP file.
Frequently Asked Questions
Is PNG compression lossless?
PNG output preserves every pixel. Our safe mode strips metadata and re-encodes cleanly. For much smaller files you can convert to WebP lossless, which is typically 25-35% smaller than PNG.
Why are PNG files so large?
PNG stores every pixel without lossy compression. Photographs in PNG can be 5-10x larger than the same image in JPG. For photos, convert to JPG, WebP, or AVIF.
Is transparency preserved?
Yes. PNG and WebP both preserve the alpha channel, so transparent areas stay transparent.
More Free Browser Image Tools
Every tool runs 100% locally in your browser memory with zero server uploads.
Compress Image
Compress any JPG, PNG, WebP, or AVIF image to a smaller file size with quality control.
Compress JPG
Compress JPG photos and images with a simple quality slider and preview.
Compress WebP
Compress WebP images with lossy or lossless modes for the smallest possible files.