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How to compress PDF?

Compress PDF from MiOffice lets you compress pdf instantly in your browser. It works on any device — Windows, Mac, Chromebook, iPhone, or Android. No account needed, no watermarks added.

Step-by-Step Guide

  1. 1Go to the Compress PDF page on MiOffice
  2. 2Select your pdf from your device
  3. 3Choose your preferred output settings
  4. 4Click process — everything runs locally in your browser
  5. 5Save the result to your device

Ready to get started?

Compress PDF — Free Online

No signup required. Files never leave your browser.

Good to Know

MiOffice processes everything client-side using WebAssembly. This means your pdf never gets uploaded to any server. The tool works offline once loaded, supports batch processing, and produces results comparable to desktop software — all for free.

Key Features

  • Files never leave your device
  • No signup or account required
  • Works on any device and browser
  • No watermarks on output
  • Unlimited usage — completely free
  • Supports batch processing

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