How does PNG compression work?
PNG uses lossless compression, so re-encoding can slightly reduce size. For dramatic reductions, convert to WebP which supports both lossy and lossless modes.
All Tools
PNG Compressor
Optimize PNG files or convert to WebP for much smaller sizes while keeping transparency.
Current scope
This tool currently processes one image at a time in your browser. The current file limit is 20MB. This statement covers the current /tools image flow, including poster-prefilled entries, not every feature on poster.sh.
Drag & drop an image here, or click to browse
Supports PNG
Max file size: 20MB
How to compress a PNG
- 1
Upload a PNG file
Select the PNG image you want to compress.
- 2
Choose output mode
Select WebP for smaller sizes or keep PNG for maximum compatibility.
- 3
Download the result
Save the compressed file to your device.
PNG Compression FAQ
Will converting to WebP preserve transparency?
Yes. WebP fully supports transparency, just like PNG.
When should I keep PNG format?
Keep PNG when you need maximum compatibility with older software, or when the file will be edited further in design tools.
Is this processed locally?
Yes. All compression happens in your browser. No images are uploaded to any server.
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