Compress Scanned PDF Online Free
Scanned PDFs are large because each page is a full-resolution image. pdfcorpus helps you compress scanned PDF files and reduce scanned PDF size for email, forms, and cloud storage.
Why scanned PDFs are bigger than text PDFs
A scanned 300 DPI A4 page can be 1–3 MB per page. Ten pages may exceed 15 MB. To shrink scanned PDF files, the compressor must lower image resolution and apply efficient encoding — pdfcorpus does this in Smallest Size and Good Quality modes.
Best mode for scanned documents
- Good Quality — Smaller file, still readable for most submissions
- Smallest Size — Maximum reduction for strict KB limits (100KB–500KB targets)
- Best Quality — Minimal compression when scan clarity is critical
Tips to compress scanned PDF further
Scan at 150–200 DPI instead of 600 DPI before creating the PDF. Remove blank pages. If only a few pages matter, use Split PDF first, then compress the smaller file on pdfcorpus.