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Merge PDF

Combine several PDF files into one, in the order you choose. Runs entirely in your browser.

Files are processed in your browser only and are never sent to a server.

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Quick answer: this tool combines several PDF files into one, right in your browser. Your files are not uploaded to any server, there is no sign-up, and there are no watermarks. Add the PDFs, set their order, and download a single merged file. It works on regular and scanned PDFs, and is handy for joining invoices, contracts, reports, or supporting documents before sending or printing. If the merged file ends up too large to email, you can compress it afterward, and your original files are never changed.

01

How to use this tool

  1. 01Choose filesDrag in or select several PDF files. You can add more files at any point before merging.
  2. 02Order and removeFiles are merged in list order. Put them in the right order and remove any file you do not need.
  3. 03Merge and downloadClick merge, and the combined PDF is ready to download right away, with no upload.
02

When is this useful?

  • Combine reportsJoin a monthly report with its appendices and receipts so reviewers open a single file instead of many.
  • Merge scanned PDFsScanned pages saved as separate PDFs? Combine them into one continuous document in the right order.
  • Combine contracts or invoicesPut a contract, an approval, and an invoice into one tidy file before emailing or archiving it.
  • Join several PDFs before sharingSend one link or attachment instead of five, which is easier for the recipient to open and keep.
  • Merge before compressing or numberingCombine first, then run the single result through Compress PDF or Add Page Numbers so you only do it once.
  • Submit forms and appendicesAttach several forms or supporting pages into one file, in the exact order a portal requires.
03

Examples

  • Two filesPick two PDFs and they become one file where the pages of the first come before the second.
  • Removing a fileAdded the wrong file? Remove it from the list before merging, without starting over.
  • Several scansCombine three separate scans into one ordered document, ready to submit.
  • Merge, then compressJoin the files here, then open Compress PDF if the combined file is too large to email.
04

Tips for a better result

  • Order mattersFiles merge in list order, and pages keep their order inside each file. Set the order before you click merge.
  • Encrypted filesA password-protected PDF may not merge. Remove the protection from the source first, then add it.
  • Large files can be slowBecause merging runs on your device, many large PDFs use more memory and take longer. Close other heavy tabs.
  • Everything stays localYou can safely merge sensitive documents: the files never leave your device and nothing is stored.

  • How PDF merging works in the browser

    The tool reads each PDF you add and joins them into one file, keeping every page in its original order within each document. It uses the pdf-lib library, which runs entirely in JavaScript on your device, so the files are never uploaded. The result is a standard PDF you can download, send, or print. That makes it a good fit when you want to merge PDFs without uploading them anywhere.

  • Merge vs. split, images to PDF, and compress

    Pick the tool that matches your goal. • Merge PDF joins two or more existing PDFs into one. • Split PDF does the opposite: it pulls selected pages out of a single PDF into a new file. • Images to PDF is for when your sources are pictures or scans (JPG, PNG, WebP) rather than PDFs. • Compress PDF reduces the size of a file after you have merged it.

  • Getting the order right, and rearranging later

    Files are combined top to bottom in the list, so arrange them before merging. If you only realize the order is wrong after downloading, you do not have to redo everything: re-add the files in the correct order, or use Split PDF and Merge PDF together to pull a section out and reinsert it where it belongs.

  • When to merge before compressing or adding page numbers

    If you plan to compress the result or add page numbers, merge first and apply those steps to the single combined file. Doing it in that order means you compress or number once, the page numbers run continuously across the whole document, and you avoid repeating the same step on every separate file.

  • Troubleshooting: what to try if it did not work

    • Merging is slow or the tab struggles: the files are large. Merge fewer at a time, or compress them first, then merge. • A file will not merge: it may be password-protected or damaged. Save an unprotected copy, or re-export a clean version, then try again. • The pages came out in the wrong order: re-add the files in the order you want, since they merge top to bottom. • The merged file is too large to email: run it through Compress PDF, or split off parts you do not need to send.

  • Privacy and safety

    Everything happens on your device. The files are not sent to a server, nothing is stored, nothing is tracked, and there is no sign-up. Your original files are left as-is; you download a new, combined copy. That makes it safe for sensitive documents such as contracts, invoices, and medical or financial records, which never leave your computer.

05

Frequently asked questions

Are the files uploaded to a server?

No. The merge runs in your browser only. The files do not go to the internet, nothing is stored on our side, and your original files are not changed; you download a new combined copy.

Can I merge more than two files?

Yes. Add as many PDFs as you like and they merge into one file in list order. Speed depends on your device, since processing is local.

Can I change the order of the files?

Files merge in the order they appear in the list. Arrange them before merging, or remove a file and add it again to change its position.

Can I merge scanned PDFs?

Yes. Scanned pages saved as PDFs merge like any other PDF. If the combined scan file is large, compress it afterward to make it easier to email.

What happens with a password-protected PDF?

An encrypted file may not merge. Remove the protection from the source first, for example by opening it and saving an unprotected copy, then add it here.

The merged file is too large to email. What do I do?

Run the merged file through Compress PDF, or use Split PDF to send only the pages a recipient needs. Merging itself does not increase total size beyond the sum of the inputs.

Should I merge before or after compressing?

Merge first, then compress the single result. That way you optimize once and keep the workflow simple, rather than compressing each file separately.

Why is merging slow, or why did it fail?

Because it runs on your device, many or very large files use more memory and take longer, and a damaged or encrypted file can fail to load. Merge fewer files at a time, or fix the problem file, then retry.

Is there a size limit, and is the tool free?

You can merge files up to 100MB each, and the tool is free with no sign-up. Because everything runs in your browser, very large files may slow down the tab.

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