Most email services cap attachments at 20-25 MB. A scanned or image-heavy PDF easily exceeds that. The good news: most PDFs can be shrunk significantly without visible quality loss.
Why do PDFs get big?
Images dominate file size: high-resolution scans, photos and embedded images. Text takes very little space. So compression mainly works by bringing images down to a reasonable resolution.
Compress step by step
- Upload the PDF: Open PDF Platform's Compress tool and select your file.
- Compress: The tool optimizes images and redundant data to reduce size.
- Download the smaller file: Download the result — it now fits into email or uploads comfortably.
Compress PDF — Reduce your PDF's size and share it easily.
The biggest gains are on scanned documents; text-only PDFs are already small, so savings are limited.
Before compressing: are there pages you don't need?
The quickest win often comes from deleting rather than compressing. In scanned documents, blank reverse sides, pages scanned twice and pointless cover sheets take up several megabytes in an ordinary file. Removing them with the delete-pages tool and then compressing beats compressing alone, and costs no quality at all.
How much will your PDF shrink?
It helps to set expectations correctly; not every file shrinks by the same amount.
- Scanned documents: the biggest gains are here. High-resolution scans usually come down substantially.
- Image-heavy decks and catalogues: good gains, but if image quality is critical you need to watch the setting.
- Text-only documents: already small, so gains are limited. You cannot turn a 400 KB contract into 100 KB.
- Files compressed before: a second pass gains little while costing quality.
Other ways to fit an email
When compression is not enough, a few practical options remain. Splitting the document into sensible parts and sending two emails is usually the cleanest answer, and the recipient gets the parts in order. For statements or reports, sending only the relevant page range both reduces size and avoids sharing information nobody asked for.
How to spot quality loss
Compression shows its effect in print and at zoom, not at normal screen size. After downloading, open the page with the smallest type and zoom to 200%: if the letters stay legible, the file is usable. Do not skip this check on documents going to an institution, because an illegible scan is one of the most common reasons for rejection.
Keeping size down from the start
- Scan at 300 DPI rather than 600; more is unnecessary for text documents.
- Do not scan black-and-white paperwork in colour; greyscale is usually enough and far smaller.
- Run phone photos through the Document Scanner instead of converting them to PDF directly.
- Do not compress and re-save the same document repeatedly; every round costs a little more quality.