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Merge PDF

Join two or more PDFs into one file without sending them anywhere. Arrange the documents in the order you need, remove any added by mistake, and download a merged PDF with every page in place.

🔒 Your PDFs never leave your device.

Drop PDFs here or click to choose

2 to 20 PDF files · 50 MB each

Add at least two PDFs to merge.

Working…
Your merged PDF is ready
Source files: – Pages: – Size: –

How to use this tool

  1. Add two or more PDFs. Drop them together or pick them one batch at a time. You can hold up to 20 files, each as large as 50 MB.
  2. Check the running order. The list reads top to bottom. Move a document with the arrows and remove anything you no longer need; its size is shown beside its name.
  3. Merge. The tool copies every page into a new document in list order, reporting each file as it goes.
  4. Download and spot-check. Open the result and confirm the page count and the transition points between documents before sending it on.

Why use this tool

Paperwork rarely arrives as a single file. A rental application may include a completed form, two months of statements and a copy of an ID, each downloaded separately. Many portals accept one attachment, and email providers cap the total size, so the pieces have to become one document with a deliberate order.

Merging here avoids a round trip to a server. That matters when the PDFs contain account numbers, medical details or signed contracts. You also get to verify the sequence before the file is created: the list is the table of contents, and moving a row changes the result immediately.

Frequently asked questions

Are the pages kept in the correct order?
Yes. Documents are merged from top to bottom in the list, and the pages inside each document keep their original order. Use the arrows to move a whole document before merging.
Can I merge a password-protected PDF?
No. An encrypted PDF cannot be opened for copying. Remove the password in a PDF reader, save an unlocked copy, then add that copy here.
Do bookmarks, links and form fields survive the merge?
The visible page content is copied, so text and images look the same. Bookmarks, internal links and interactive form fields are not carried over, and any filled-in values should be checked before you rely on them.
How many PDFs can I combine?
Between 2 and 20 files, with each file limited to 50 MB. Large documents are held in memory, so a lower total size keeps the merge quick and reliable.
Why is the merged file smaller than the originals added together?
pdf-lib rebuilds the document instead of gluing the files byte for byte. Shared fonts, duplicate images and unused objects can be written once, which often trims the total size.