You attach the file, hit send, and the email bounces: the PDF is over the 25 MB limit. It's one of the most common small annoyances in office work — and it's almost always fixable in under a minute.
Why PDFs get so big
Three things bloat a PDF: high-resolution images (a scanner set to 600 DPI produces enormous pages), embedded fonts, and scans stored as full-size photographs of each page. A ten-page contract that's really ten photos can easily top 30 MB, while the same contract as digital text might be under 1 MB.
The fastest fix: compress
For most oversized PDFs, compression is the answer. Our Compress PDF tool re-renders each page and re-encodes it at a lower quality, then shows you the exact before/after size so you can see what you're trading.
- Recommended — the balanced default; good for sharing and screen reading.
- Maximum — the smallest file; best when a portal caps uploads at a few megabytes.
- High quality — a gentle reduction that keeps pages crisp for printing.
One honest trade-off: because compression rasterises the pages, the text stops being selectable. If you need the recipient to copy text or search the document, compress less aggressively, or use a different approach below.
When compression isn't enough
Sometimes the file is big because it simply contains a lot. If you only need to send part of it, don't shrink the whole thing — send less of it. Use Split PDF to break the document into smaller files, or Extract PDF Pages to pull out just the pages that matter (for example, pages 3–5 of a long report). A five-page extract is a fraction of the size and often all the recipient wanted.
Avoid the quality traps
- Don't compress the same file repeatedly — each pass loses more detail. Always start from the original.
- Keep an untouched copy before you compress, in case you need the full-quality version later.
- Scanned documents shrink the most; already-optimised, text-only PDFs may barely change — that's normal.
- Everything happens in your browser, so even confidential files never leave your device.
Put together, the workflow is simple: try Compress PDF first, check the new size, and if it's still too big, split out only the pages you actually need to send.