How to compress a PDF for WhatsApp, under the 100MB cap, fast
WhatsApp caps document attachments at 100MB. Most quotation PDFs, scanned bills, and student notes from camera apps blow past that easily. Here's how to get under the limit without losing readability, entirely in your browser.
WhatsApp caps document attachments at 100MB. Sounds generous, until you try to send a quotation PDF generated by a desktop printer driver, a scanned bill from a doc-scanner app, or a whole chapter of student notes shot on a phone. All three routinely come out at 120-300MB. WhatsApp refuses. Now what?
Why phone-generated PDFs are so big
- Doc-scanner apps embed each page as a 12-megapixel image. A 20-page scanned chapter is 60-80MB before any text exists.
- Adobe / Microsoft PDF drivers don't compress aggressively by default. They prioritise round-trip fidelity. Exported quote with logos and screenshots? 40-60MB.
- Embedded font subsets stack up. Each unique style adds 50-200KB. Documents with mixed fonts (Hindi + English + Roman numerals + bold/italic) easily carry 1MB of font data alone.
The browser-only workflow
Drop your PDF into LovedPDF's compressor. Pick a quality level, High first; it usually drops the file size by 50-70% with no visible change. For a phone-scanned PDF that started at 180MB, that's well under the WhatsApp limit on the first try.
If High doesn't get you under 100MB, drop to Medium or Low. The text stays readable; the photos soften.
When the compressor alone can't hit it
For very long scanned chapters (50+ pages of phone photos), even Low quality might leave you at 110-130MB. Two escape hatches:
- Split into two messages. Use /split-pdf to chunk into two halves, each well under 100MB. WhatsApp will send both.
- Drop pages you don't need. Use /extract-pages to keep only the chapters you actually need to send.
Why not just use WhatsApp's built-in compression?
WhatsApp compresses images and videos automatically, but it does NOT compress PDF attachments. PDFs go through as-is, which is why large files hit the cap. You have to compress before attaching.
About the privacy angle
If the document is a bank statement, scanned ID, signed agreement, salary slip, or a child's report card, and many WhatsApp PDFs are exactly that, uploading to a free online compressor doubles your exposure. The PDF goes to their server, then back to you, then to WhatsApp. Our compressor runs entirely in your browser, so the file never leaves your laptop until you hit Send in WhatsApp.
Related
- Compress PDF, the tool this post is about
- Split PDF, chunk before sending
- Extract Pages, drop what you don't need
- Compress PDF to 100KB, when forms have stricter caps
- Compress without losing quality
Tools mentioned in this post
Read next
How to compress a PDF to 100KB, without losing readability
Most online forms cap PDF uploads at 100KB, 200KB, or 1MB. Here's how to actually hit those targets while keeping the document legible, and what to do when you can't.
How to compress a PDF to 100KB without ruining quality
A practical guide to PDF compression: what actually shrinks files, the tradeoffs, and a free browser-only tool that does it well.