How to make a PDF small enough to email or upload

You've finished the document, exported it to PDF, and the upload portal says file too large. It's one of the most common last-minute problems with documents. Here's what's going on and how to fix it.

Why PDFs get large

Text is tiny. A 50-page text-only PDF is often under 1 MB. What makes PDFs heavy is almost always images:

Photos from a phone camera, which are often 3–5 MB each at full resolution.
Scanned pages, where each page is a full-page picture.
Screenshots pasted at high resolution, often saved as PNG.

Fonts can add a little too, but rarely more than a megabyte or two.

What compression changes, and what it doesn't

Good PDF compression re-encodes the images inside the file at a sensible quality and resolution for the screen. It should leave text, fonts and vector graphics (charts, logos, lines) untouched, so text stays sharp and searchable.

On FilePro you choose between three levels:

Light: images stay close to the original. Use it when the document might be printed.
Recommended: the right choice for email and reading on screen.
Strong: the smallest file, for strict limits like 2 MB portals.

If re-encoding an image wouldn't make it smaller, the original is kept, so compression never makes your file worse.

If the file is still too big

Split it. Some portals accept several files. Split the PDF into parts.
Remove pages you don't need, such as blank pages or duplicate scans.
Re-scan at a lower resolution. For text documents, 150–200 DPI in greyscale is plenty.
Export again from the source. Word and Google Docs often have a "smaller file size" option in the PDF export dialog.

A quick checklist before you submit

Open the compressed file and zoom into a photo or chart to check it's still legible.
Search for a word to confirm the text is still selectable.
Check the page count matches the original.

Try it with Compress PDF. It's included in every paid plan, and your files are deleted automatically afterwards.