Offline PDF compressors for Mac
A Mac can compress PDFs offline in three ways. Preview comes with macOS and has one Reduce File Size filter. FileMate adds Compress PDF to Finder’s right-click menu, with three levels, batch compression and a check that text, links and forms survived. Ghostscript, a free command-line tool, offers full control for people comfortable with Terminal. None of them need an internet connection to compress.
FileMate compresses PDFs on your Mac, with Wi-Fi on or off.
Compress a PDF offline with FileMate
- Right-click the PDF in Finder.
- Choose FileMate › Compress PDF.
- The smaller copy is saved next to the original. No connection needed.
FileMate needs the internet once per Mac, to activate the licence. After that, every action works offline.
The offline options compared
| Preview | FileMate | Ghostscript | |
|---|---|---|---|
| Install | Comes with macOS | App, one-time purchase | Command line, via a package manager |
| How you use it | Open, File › Export, Quartz filter | Right-click in Finder | A command in Terminal |
| Settings | One fixed filter | Safe, Stronger, Maximum | Many, from presets to per-image options |
| Batch | No | Yes | With a script |
| Protects text, links, forms | Not checked | Checked after every Safe and Stronger rewrite | Depends on settings |
| Leaves signed and protected PDFs alone | Not checked | Yes | Depends on settings |
When Preview is enough
For a single PDF that needs to get somewhat smaller, try Preview first. If the result is readable and small enough, you’re done. If it blurs scans or makes the file larger, which it can, there’s no other setting to try.
When Ghostscript makes sense
Ghostscript is powerful and free. It’s the right choice for automated workflows and people who enjoy tuning parameters. It has no interface, and depending on the settings its output can drop structure such as tags or form fields without warning.
When FileMate makes sense
When you compress PDFs regularly and want it done from Finder, in one step, with predictable results: text stays text at the first two levels, the original is never touched, and every result shows the saving. See how FileMate’s levels work.
Why “offline” matters
Offline means the PDF is never transmitted anywhere. That’s the reliable way to keep a confidential document confidential, and it means compression works on a plane, on a train, or behind a network that blocks file-sharing sites.
Get FileMate
An offline PDF compressor that lives in Finder: right-click, Compress PDF, done. The PDF never leaves your Mac, connected or not.
Normal price €9.99, now €4.99 incl. VAT
One payment, no subscription. macOS 14 Sonoma or later, Apple silicon or Intel.