PDF Compressor

Shrink PDF size without uploading. Three compression modes processed locally in a background Worker to keep the UI smooth and responsive.

Pure Client-Side Local Memory Processing · Zero Data Upload

Usage Guide

  • Choose a PDF and let the browser inspect its pages and current size.
  • Start with lossless or balanced mode, then compare the preview before choosing stronger settings.
  • Download the result and verify text, images, links, forms, and page order before sharing.

Security & Privacy Guarantee

  • Scanned and image-heavy PDFs usually shrink more than already optimized text and vector documents.
  • Stronger compression can soften text, remove interactivity, or make output larger in edge cases.
  • Protected, damaged, or very large documents may exceed browser memory and need a desktop tool.

Frequently Asked Questions

Q: Is the PDF uploaded while it is compressed?
A: No. The PDF is decoded and written in your browser. Normal site assets download, but your document is not sent to a compression server.
Q: Which compression mode should I choose?
A: Use lossless to preserve text and vectors, balanced for everyday sharing, and stronger settings only after checking the visual preview.