Compress PDF to 16MB for WhatsApp
Shrink any PDF below the WhatsApp document limit — free, private, no upload.
Tap to choose a PDF, or drag & drop it here
Any PDF document
100% private — files never leave your device
Output PDF is image-based (text won't be selectable) — perfect for sharing on WhatsApp.
How to compress a PDF to 16MB for WhatsApp
Choose your PDF. Tap the box above and select the document you want to send, or drag and drop it in.
Pick a target size. Keep Under 16 MB selected for WhatsApp, or choose 25 MB for email attachments or 5 MB for stricter limits.
Press "Compress PDF". The tool renders each page and automatically tries progressively stronger settings until the file fits your target. You'll see the page-by-page progress as it works.
Download and send. Save the compressed PDF and attach it in WhatsApp like any other document.
Why do PDFs need to be under 16MB for WhatsApp?
WhatsApp caps document attachments — the long-standing limit is 16 MB on many versions and regions. When a scanned contract, e-book, portfolio or lecture notes file exceeds the limit, WhatsApp simply refuses to send it. Scanned PDFs are the most common offenders: each page is a large photograph, so a 20-page scan can easily reach 40–80 MB.
This tool rebuilds your PDF page by page. Each page is rendered and re-saved as an efficiently compressed image, and the pages are reassembled into a fresh, lightweight PDF. The compressor starts gently — high quality, high resolution — and only steps down in quality if the file still doesn't fit your target, so you always get the best-looking document that fits under the limit. Text stays sharp and readable at normal zoom, and the page layout is preserved exactly.
Everything happens in your browser. Unlike online PDF compressors that upload your document to their servers, your file never leaves your device — important when the PDF is a contract, an ID scan, bank statements or anything else you wouldn't hand to a stranger. There are no file limits, no queues and no sign-up.
Frequently asked questions
How do I compress a PDF to 16MB for WhatsApp?
Select your PDF above, keep the "Under 16 MB — WhatsApp" target selected, and press Compress PDF. The tool automatically tries stronger settings until the file fits under 16MB, then gives you a download button.
Is my PDF uploaded anywhere?
No. The PDF is opened, rendered and rebuilt entirely inside your browser. It never leaves your device, so it is safe to compress contracts, ID documents and other private files.
Why is the compressed PDF not text-selectable?
To achieve large size reductions, each page is re-rendered as an optimized image. The document looks the same and prints fine, but the text becomes part of the image. This is ideal for sharing and reading, less so if the recipient needs to copy text.
What is the WhatsApp file size limit for PDFs?
WhatsApp historically limited documents to 16MB, and even where larger limits exist, files under 16MB send faster and reliably on all versions. This tool targets 16MB by default so your PDF sends everywhere.
What if my PDF still does not fit under the target?
The tool will warn you and still give you the smallest version it could produce. Extremely long or image-heavy PDFs may not fit — try splitting the document into two smaller PDFs and compressing each.