How to compress a PDF for WhatsApp
WhatsApp allows large documents, but sending a 40 MB scan over mobile data is slow for you and storage-hungry for everyone in the group. Compressing first makes the send near-instant and is kinder to phones.
Because FernPDF runs in the browser, this works directly on your phone: open the tool in Chrome or Safari, compress, then share the downloaded file to WhatsApp.
Group chats make the case stronger than a one-to-one send: a heavy PDF shared to a 30-person group multiplies the download cost by everyone in it, not just you, and it sits in every one of those phones' storage afterwards. Compressing before you share is a small step for the sender and a meaningfully smaller one for everyone downloading it on the other end, especially on an older phone with limited storage.
Step by step
- 1On your phone or computer, open the Compress PDF tool.
- 2Drop or select the PDF.
- 3Pick “Recommended” (or “Strong” for scans).
- 4Download, then attach it in WhatsApp as a document.
Common questions
Every FernPDF tool processes files in your browser: read how the privacy model works, or verify it yourself in your network tab.