How to Compress a PDF on Mac (Without Making It Blurry)
Three ways to shrink a PDF on your Mac — with Preview, a free private online tool, or a one-click app — and how to keep text sharp.
Big PDFs bounce off email attachment limits, upload forms and chat apps. The good news: most PDFs can be made much smaller. The trick is doing it without turning crisp text into a blurry mess.
Why some PDFs are so big
Almost all of a PDF's size comes from images — scanned pages, photos and screenshots saved at very high resolution. Text and vector graphics take up very little space. Compressing a PDF mostly means re-saving those images at a sensible resolution and quality.
Method 1: Preview (free, built in)
- 1Open the PDF in Preview.
- 2Choose File → Export.
- 3In the Quartz Filter menu, choose “Reduce File Size”.
- 4Click Save under a new name, so you keep the original.
Method 2: A free tool that doesn't upload your file
Most compress-PDF websites upload your document to their servers. Our free Compress PDF tool runs entirely in your browser, so the file never leaves your Mac — useful for contracts, payslips and ID documents.
Open the free Compress PDF toolFree · runs in your browser · nothing uploadedMethod 3: One click, three quality levels
In ilovepdfmac, drop the PDF on the window, pick Low, Recommended or Extreme, and you'll see exactly how much smaller it gets before saving. Text stays sharp because only images are re-compressed. It works offline, for $9.99 once.
Tips for the smallest file
- Scanned documents shrink the most — often 70–90%.
- PDFs made from Word or Pages are usually small already; there's little left to remove.
- If you only need a few pages, extract them first — fewer pages, smaller file.
- Need it searchable too? Run OCR before compressing.
