WhatsApp has a 100 MB file size limit for documents, including PDFs. Most everyday PDFs come nowhere near that limit, a typed letter or bank statement is usually a few MB at most. But photo-heavy PDFs, design exports, portfolios, and bundles of scanned pages can exceed 100 MB without much difficulty. If WhatsApp is refusing to send your file, the quickest fix is compression.
Why WhatsApp PDFs fail to send
The most common reasons a PDF hits the WhatsApp limit:
- Unoptimised exports from design tools, Canva, InDesign, and similar apps often export at print quality by default. A brochure or portfolio designed for printing can easily be 50-200 MB.
- Scanned bundles, scanning 20-30 pages on a phone app at full resolution produces a file that may exceed 100 MB, particularly if the scanner saves in colour.
- Multiple merged documents, combining several PDFs without compressing the result can produce an unexpectedly large file.
- Photos embedded in documents, a single full-resolution photo from a modern smartphone camera can be 4-8 MB. Several photos in one document add up quickly.
How to compress a PDF for WhatsApp
Open PDFWhisk's PDF compressor in your phone browser. Drop your PDF into the tool and select a target size that will get you comfortably under 100 MB. For most large PDFs, a 25 MB target will reduce the file significantly while keeping quality acceptable for on-screen reading.
After downloading the compressed file, check that it is under 100 MB and review the content briefly, particularly any small text or images, before sending.
If the PDF is over 200 MB
If your file is very large, say 200 MB or more, consider a two-step approach:
- Compress first using a 25 MB target. This will bring the file down significantly.
- If still over 100 MB, split the document into two or more parts using PDFWhisk's split tool, then compress each part if needed.
Sending a PDF in two parts is usually fine, just let the recipient know to expect two files. This is often a better outcome than compressing so aggressively that the content becomes hard to read.
WhatsApp Business has the same limit
Whether you are using the standard WhatsApp app or WhatsApp Business, the 100 MB document limit applies in the same way. There is no higher limit available for business accounts. If you regularly need to send large files to clients or colleagues, consider switching to sharing via Google Drive or Dropbox and sending the link instead, these have no meaningful file size restriction for sharing.
iOS share sheet: sending from iPhone
On iPhone, once you have compressed the PDF and it is saved in your Files app, you can send it directly from there:
- Open the Files app and locate the compressed PDF (usually in Downloads).
- Long-press the file to bring up the context menu.
- Tap Share and select WhatsApp from the share sheet.
- Choose the contact or group to send to.
Alternatively, in a WhatsApp conversation, tap the attachment icon (paperclip or plus), choose Document, and navigate to the Files app to select the PDF directly from there.
Android share sheet: sending from Android
On Android, the process is similar:
- Open your file manager (Files by Google or Samsung Files) and find the compressed PDF.
- Long-press the file and tap Share.
- Select WhatsApp from the share sheet and choose your recipient.
If WhatsApp does not appear in the share sheet immediately, scroll down or tap "More" to find it in the full app list.
A note on document quality
For WhatsApp sharing, the recipient is almost always viewing the PDF on a phone screen, not printing it. That means you can compress more aggressively than you might for an official submission without the result looking noticeably worse. A 25 MB or even 10 MB compressed version of a brochure or portfolio will look perfectly fine on a phone screen, even if it would not be suitable for high-quality print.
Compress your PDF, bring it under the limit, and send it via WhatsApp without any hassle. Open the compressor to get started.