PDF compression guides
How to Compress a PDF on a Mac in Your Browser
A simple Mac workflow for selecting, compressing, downloading, and checking a PDF without replacing the source.
Last updated
On a Mac, open PDFStay in a current browser, choose the PDF from Finder, and start with a moderate compression mode. Wait for processing to finish, download the output to a known folder, and compare it with the original in Preview or another trusted viewer. Check page count, text, images, links, and forms before sending the new copy.
Use Finder and a browser copy safely
The operating system changes where you select and save the file, not the document checks you should perform. Make a duplicate in Finder, process that copy, and save the result with a new name. PDFStay's browser processing can be inspected as a client-side workflow; do not treat that as a promise that every browser or extension behaves identically.1, 2
| Step | Action | Result |
|---|---|---|
| Select | Choose a duplicate from Finder | Original remains untouched |
| Save | Download to a named folder | Output is easy to identify and verify |
Inspect the downloaded file on macOS
- Duplicate the source and note its original size.
- Compress the duplicate in the browser.
- Open the downloaded PDF in Preview and review all pages.
- Test important links and forms before sharing.
FAQ
Does Mac Preview compress the same way as PDFStay?
No. Different tools expose different settings and can handle PDF features differently. Compare the output from the tool you actually plan to use.
Do I need a Mac app for this workflow?
No. PDFStay's compression tool is browser-based. A current browser and enough local memory are still required.
Sources
- PDFStay — Compress PDF workflowPDFStay first-party methodologySource reviewed:
- Chrome for Developers — Inspect network activityofficial technical documentationSource reviewed: