how-to5 min
How to Compress PDF on Mac Using Preview
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By Steven Clark
Quick Answer
FreeConversion compresses your PDFs up to 90% of their original size while preserving visual quality, using 100% local processing via WebAssembly. No uploads, no file limits.
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Reduces PDF size by an average of 78%%
Processing in less than 5 seconds for a 10MB file%
100% of files stay on your device%
Compatible with 99% of PDF readers“Use Mac's built-in Preview app to compress PDFs for free.”
Mac users have a free PDF compressor built right in: Preview.
Step-by-Step Guide
- Open your PDF in Preview
- Click File → Export
- Click the Quartz Filter dropdown
- Select "Reduce File Size"
- 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.