How to compress a PDF for email

Gmail caps attachments at 25 MB, Outlook at 20 MB by default, and plenty of corporate servers stop at 10 MB. If your PDF bounces, you don't need to split it across three emails. Compress it.

FernPDF's compressor re-encodes the document on your device. “Recommended” is visually lossless for most documents and typically gets image-heavy PDFs down 60% or more; “Strong” goes further when the deadline matters more than perfect image crispness.

The compressor works the same whether the bloat comes from a scanned signature page, embedded fonts, or a stack of high-resolution photos pasted into a report: it re-encodes every image in the file rather than hunting for one specific cause, so you don't need to know why the PDF is heavy before you fix it. The size estimate updates the moment you pick a level, so there's no blind re-download loop.

Every FernPDF tool processes files in your browser: read how the privacy model works, or verify it yourself in your network tab.