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Merge PDF Files

Combine multiple PDFs into one. Reorder pages before merging. 100% private — runs in your browser.

Up to 20 files30 MB per file100 MB total
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Drop PDF files here or browse

Add 2–20 PDFs · max 30 MB each · 100 MB total

How to Merge PDFs

  1. 1Upload 2 or more PDF files using the button above.
  2. 2Reorder files using the ↑ ↓ arrows — the order here is the page order in the merged PDF.
  3. 3Click Merge and your combined PDF downloads instantly.

Frequently Asked Questions

How many PDFs can I merge?
You can merge up to 20 PDFs at once. Need more? Download the merged file, then merge it again with additional files.
Is there a file size limit?
Yes — max 30 MB per file and 100 MB total. This ensures reliable merging across all devices and browsers. For very large catalogs (100 MB+), consider splitting them first using our PDF Compress tool.
Will the merged PDF lose quality?
No — pdf-lib copies pages at their original resolution. No re-compression or quality loss occurs.
Is my data safe?
Yes. Everything runs inside your browser — your files are never uploaded to any server.