How this compressor works
Most of the weight in a large PDF comes from images: scanned pages and phone photos are often stored at a far higher resolution than anyone needs for reading. This tool redraws every page as an optimised image at a lower resolution and rebuilds the document from those pages.
| Level | Resolution | Use it for |
|---|---|---|
| Light | ~144 DPI | Documents that may be printed |
| Balanced | ~108 DPI | E-mail attachments, online forms |
| Strong | ~80 DPI | Tight upload limits, reading on screen |
What you should know before compressing
Important: because pages become images, text in the compressed file can no longer be selected, searched or copied, and links stop working. Keep your original file.
- Scanned documents and photo PDFs usually become 50–90% smaller with little visible change.
- Text-only PDFs exported from Word or Google Docs are already small. Compressing them this way can make them larger; the tool will tell you when the original is the better choice.
Other ways to make a PDF smaller
- Remove pages you do not need with split PDF.
- If the PDF was made from photos, shrink the photos first with reduce image size in KB and rebuild it with JPG to PDF.