Squezr

Free Online PNG Compressor

Compress PNG Images Without Losing Transparency

PNG files can be large. Squezr helps you reduce PNG file size by re-encoding and optionally resizing your images. Transparency is preserved throughout the process.

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Features

  • Compress PNG files to a target size
  • Preserves transparency (alpha channel)
  • Lossless re-encoding for best quality
  • Progressive resizing for smaller targets
  • Convert to WebP or JPEG for even smaller sizes
  • No server upload — fully private

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Frequently Asked Questions

Can PNG compression be lossless?
PNG is inherently a lossless format. Squezr can re-encode PNGs but significant size reduction may require resizing. For aggressive compression, consider converting to WebP.
Will transparency be preserved?
Yes, if you output as PNG or WebP, transparency is preserved. JPEG output does not support transparency.
Is my image uploaded to a server?
No! Squezr processes everything directly in your browser using Web Workers. Your images never leave your device, ensuring complete privacy.
What image formats are supported?
Squezr supports JPEG, PNG, and WebP formats for both input and output. You can convert between formats during compression.
How does the compression work?
Squezr uses a binary search algorithm over quality parameters to find the highest quality that meets your target size. If quality reduction alone isn't enough, it progressively reduces image dimensions.
Is there a file size limit?
Yes, the maximum input file size is 50 MB and the maximum image resolution is 100 megapixels. These limits protect your browser from running out of memory.
Is Squezr free to use?
Yes, Squezr is completely free to use with no watermarks or hidden charges.