How to compress a PDF for email

Why PDFs get rejected by email

Most email providers limit attachment size. Gmail commonly blocks files over about 25 MB, and many corporate Outlook systems set even lower caps (often 10–20 MB). A scanned contract, photo-heavy report, or exported PowerPoint can jump past that limit quickly.

Compressing a PDF reduces embedded image resolution and cleans heavy page data so the same document can send as a normal attachment instead of bouncing back with an error.

Which compression level to choose

LitePDF Pro offers three levels so you can balance size and clarity:

• Recommended — best starting point for resumes, invoices, and everyday documents.
• Extreme — strongest size drop for photo-heavy files when email must go through.
• Less — milder reduction when print quality matters more than file size.

Step-by-step: compress a PDF for email

Follow these steps on a desktop or phone. The tool works in the browser — nothing to install.

1. Open the free Compress PDF tool on LitePDF Pro.
2. Upload your PDF (up to 40 MB for most files).
3. Choose Recommended compression first.
4. Click Continue and download the smaller PDF.
5. Check the new file size in your downloads folder.
6. If it is still too large for email, run Extreme compression once more — or split the PDF into parts.

Tips for better results

Always keep an original copy before aggressive compression. If text looks soft after Extreme mode, switch to Less compression or remove unused pages with Split PDF / Extract pages first.

After the file is small enough, you can also password protect it before sending sensitive contracts.