June 3, 2026
How to Compress a PDF for Email
Most email clients cap attachments at 10–25 MB. Here's how to compress a PDF so it fits — and what to do when compression isn't enough.
Why PDFs Get Large
PDF size is driven almost entirely by images. A text-only PDF is tiny — a few kilobytes per page. Add high-resolution photos, scanned pages, or embedded graphics and the file balloons. A 20-page presentation with full-bleed images can easily hit 50 MB.
How PDF Compression Works
Compression tools like Ghostscript resample embedded images at a lower resolution. A 300 DPI photo gets downsampled to 96–150 DPI — still readable on screen, smaller in file size. The text layer is unaffected. The compression is lossy for images but invisible for most practical purposes.
How Much Will It Shrink?
Image-heavy PDFs typically shrink 30–70%. A 20 MB presentation often compresses to 4–8 MB. Text-only PDFs may shrink 5–15% — there's less redundant data to remove. The exact reduction depends on image density, original resolution, and how the PDF was created.
Compress a PDF in Seconds
Upload your PDF to Papyrio's Compress PDF tool. Ghostscript optimises the file structure and resamples images. Download the compressed PDF. No signup, no watermark, files deleted immediately. Free users get up to 10 compressions per day.
When Compression Isn't Enough
If the PDF is still too large after compression, consider splitting it. Upload to Split PDF to get individual page files, then email only the pages the recipient needs. Alternatively, upload to a cloud service and share a link instead of an attachment — Google Drive, Dropbox, and OneDrive all generate shareable links for free.