How to Compress PDF on Mac, Windows & Chromebook — No Software

The Problem With Built-In Tools

Every operating system offers some PDF capability, but none does compression well:

• Mac Preview — can "reduce file size" but uses aggressive compression with no control. Results are often blurry.
• Windows — has no built-in PDF compressor at all. Microsoft pushes you toward paid tools.
• Chromebook — Chrome OS has zero PDF editing capability. You need a web tool.
• Linux — Ghostscript works but requires command-line knowledge and specific flags.

A browser-based compressor works identically on all platforms — same tool, same results, same privacy.

Compress PDF on Any Platform

1. Open your browser (Safari on Mac, Chrome/Edge on Windows, Chrome on Chromebook)
2. Go to the Compress PDF tool
3. Drop your PDF file onto the page
4. Choose compression level
5. Download the compressed file

This works identically on Mac, Windows, Chromebook, Linux, and even phones. Your PDF is processed in your browser — nothing is uploaded to any server.

Mac-Specific Tips

• Don't use Preview's "Reduce File Size" — it applies maximum compression with no quality control. Text becomes blurry, images pixelate.
• Finder Quick Actions can create PDFs but cannot compress existing ones.
• Safari works perfectly for our tool. No need to switch to Chrome.

Windows-Specific Tips

• Microsoft Print to PDF doesn't compress — it creates PDFs at full quality.
• "Reduce file size" in Word only works for PDFs you created in Word, not for received PDFs.
• Edge and Chrome both work for our browser-based tool. No preference between them.

Chromebook-Specific Tips

Chromebooks are perfect for browser-based tools — your entire workflow is in the browser already. No apps to install from the Play Store. Just open the tool in Chrome and process your PDF. Works offline too, once the page is loaded.