Compress PDF — Reduce File Size up to 80%, Free Online

Shrink PDF files by up to 80% while keeping them readable. Fast processing, no watermarks, no file limits. Works in your browser — your files never leave your device.

Key Features

  • Auto-deletion of files within 1 hour
  • HTTPS encryption for transfers
  • No watermarks added
  • No account required
  • Adjustable compression levels

How It Works

  1. Compression optimizes embedded images and removes unnecessary metadata
  2. Uses pdf-lib for PDF structure optimization
  3. Multiple compression levels available: light, medium, and maximum
  4. Text content quality is preserved across all compression levels
  5. Files are processed on server and deleted within 1 hour

Frequently Asked Questions

How much can a PDF be compressed?

Compression depends on the content. PDFs with large images can often be reduced by 50-80%. Text-heavy PDFs with few images may see smaller reductions (10-30%).

Does compression reduce quality?

Text remains sharp at all compression levels. Image quality may decrease slightly at higher compression levels. Use the medium setting for a good balance of size and quality.

Is there a file size limit?

Free users can compress PDFs up to 25MB. This covers most standard documents and presentations.

By Nuthu Mwangi · File compression and document optimization · Last updated 2025-09-01

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