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SquooshImage Optimizer
Free

Free to use.

 Free

Free and open source under the MIT licence.

Web Linux
  • Side-by-side comparison makes it easy to judge quality versus file size trade-offs
  • Runs entirely in the browser with no upload needed
  • Lossless compression with identical pixels
  • Processes a whole folder at once
  • Focused narrowly on compression and format conversion, not general image editing
  • Best suited to single images rather than batch processing
  • Only PNG and JPEG
  • Overwrites the original files in place
Web application Downloadable app
Closed source Open source
License not stated License: MIT
Not stated if an account is needed No account needed
Not stated if it works offline Not stated if it works offline

Checked September 22, 2026

Checked October 1, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.