PDF Compressor

Reduce PDF file size in your browser. Lossless compression — text stays searchable and selectable. Zero upload by default.

Browser-side default Zero logs No account needed
Your file is processed locally in your browser. Nothing is uploaded to any server. Zero logs. Zero tracking.

Drop a PDF here or click to browse

PDF files only — max 70 MB

Free PDF Compressor — Reduce PDF Size Online

Reduce your PDF file size instantly, right in your browser. Browser compression uses lossless methods — metadata stripping and object-stream rewriting — to shrink your file without converting text to images. Your PDF stays fully searchable and copy-able. Optionally, admins can enable the “Compress on Server” option for deeper compression.

Browser Compression vs. Server Compression — Which Should You Choose?

  • Browser Compression: Completely private. Your PDF never leaves your device. Uses lossless methods: strips metadata and rebuilds the PDF using compressed object streams. Text, fonts, and vector graphics are fully preserved. Works best on PDFs that have not previously been optimised.
  • Server Compression: Sends your file to our server for professional-grade compression. Preserves all text, fonts, and vector content. Typically achieves 20–60% size reduction. Best for heavily embedded or image-rich PDFs.

How to Compress a PDF

  1. Drop your PDF into the upload zone or click to browse.
  2. Select your compression method (Browser or Server, if available).
  3. Click Compress PDF. The compressed file downloads automatically.

Privacy — Zero Upload by Default

Browser compression uses pdf-lib to rebuild your PDF entirely in your browser memory. Nothing is transmitted to any server. When “Compress on Server” mode is enabled, the file is sent over HTTPS, processed, and immediately deleted.

Frequently Asked Questions

Will my PDF be uploaded to a server?
By default, no. Browser compression processes your PDF entirely in your browser using pdf-lib. Your file never leaves your device. If you choose “Compress on Server” (when enabled by your admin), the file is sent to our server over HTTPS, processed, and immediately deleted.
Does browser compression preserve my text?
Yes. Browser compression uses lossless methods — stripping metadata and rebuilding the PDF with compressed object streams. Text, fonts, and vector graphics are fully preserved and remain searchable and selectable.
How much can the file size be reduced?
It depends on the PDF. Browser compression works best on PDFs not previously optimised — it can save 10–40% by rewriting internal structures. Highly compressed PDFs may see minimal gains. Server compression typically achieves 20–60% size reduction.
Is there a file size limit?
Guest users can compress files up to 10 MB. Logged-in users up to 50 MB. Administrators have no limit. These limits are configurable by the site admin.
Can I compress password-protected PDFs?
No. Password-protected PDFs cannot be opened or processed by either compression method.

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