How to Compress PDF on Mac Using Preview

Mac users have a free PDF compressor built right in: Preview.

Step-by-Step Guide

1. Open your PDF in Preview
2. Click File → Export
3. Click the Quartz Filter dropdown
4. Select "Reduce File Size"
5. Click Save

Pros and Cons

Pros:

• Free and built-in
• No internet required
• Simple and fast

Cons:

• Aggressive compression (can over-compress)
• No control over compression level
• May significantly reduce image quality

When to Use Preview

Best for quick compression when quality isn't critical. For better control, use an online tool like FreeConversion.

Advanced: Custom Quartz Filters

Power users can create custom Quartz filters in ColorSync Utility for precise control over compression settings.