Compress PNG Online
Optimize PNG images with lossless compression. No quality loss, smaller files. 100% private.
Lossless PNG Optimization
PNG compression is lossless — your image quality is perfectly preserved. img.awajis optimizes the internal compression structure to produce smaller files without changing a single pixel. Processing happens entirely in your browser using WebAssembly.
When to Use PNG
PNG is the best choice for images with transparency, sharp text, logos, screenshots, and graphics with flat colors. Unlike JPEG, PNG preserves every pixel exactly, making it ideal when quality is more important than file size.
Need even smaller files? Convert your PNGs to WebP for significant size reduction, or resize them to fit your target dimensions.
Frequently asked questions
Is PNG compression lossless?
Yes. PNG uses lossless compression, so the optimised image is pixel-for-pixel identical to the original — only the file size changes.
Why is my PNG still large?
PNG suits flat graphics and transparency, not photos. For photographic images, converting to JPEG or WebP usually gives a far smaller file.
Does it keep transparency?
Yes — the alpha channel is preserved, so transparent areas stay transparent.
Are my files uploaded?
No. Everything is processed locally in your browser; nothing is sent to a server.
How much can PNG compression save?
Lossless optimisation typically trims 10–40% off a PNG by removing redundant data. Screenshots, logos, and flat graphics compress the most; photos saved as PNG save the least.
Does compressing a PNG reduce its colours?
No. The image stays lossless and identical in appearance — only redundant data is removed, so every colour and transparent pixel is preserved.
Should I use PNG or WebP for graphics?
WebP is usually far smaller than PNG at matching quality and still supports transparency. Choose PNG only when you need maximum compatibility; otherwise convert to WebP.
Why is my photo so large as a PNG?
PNG is designed for flat graphics, not photographs. For photos, JPEG or WebP produce a dramatically smaller file at the same visible quality.