Compress PNG Images Online for Free
Compress PNG images online for free with no upload and no software to install. Compression runs entirely in your browser — your PNG file is never sent to any server. Reduce PNG file size by up to 90% in seconds.
No upload — compression runs entirely in your browser. Files never leave your device.
Note about transparency: PNG files with transparent backgrounds will be converted to JPEG with a white background. If you need to preserve transparency, use Low compression to minimise visual impact.
Compress your PNG file now — free, private, no account needed.
Compress PNG FreeHow to compress a PNG image online
- Click "Compress Image" and select your PNG file (up to 50 MB)
- Choose a compression level: Low (~70% smaller, best for transparency-sensitive images), Medium (~85%), or High (~90%)
- Download your compressed image as a JPEG file instantly
PNG vs JPEG — what changes during compression?
PNG files use lossless compression — every pixel is stored exactly. This produces large file sizes, especially for photographs. CompressFiles re-encodes your PNG as a JPEG, using JPEG's lossy compression to achieve dramatic file size reductions. The trade-off: JPEG does not support transparent pixels, so any transparent areas become white in the output.
When is PNG compression most effective?
- Best for: Photographs, complex images with gradients, screenshots of photos or web pages
- Less effective for: Logos, icons, flat-colour illustrations (these are already small as PNG)
- Not suitable if: You need to preserve a transparent background
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