Combine PDF files into one
Join contracts, scans and statements into a single PDF without sending any of them anywhere.
- Nothing is uploaded
- Works offline after first visit
- Open source
- No watermark · limit is your device’s memory; phones hold less
Combine several PDF files into a single document in your browser. It is free, needs no account and adds no watermark, and your files are not uploaded: everything runs in your browser on your device. The size limit is your device’s memory, and phones hold less; give the page a short while after one visit to save itself for offline use, and then it works offline.
Done
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Open the network tab. Your files never appear in it.
Add files and run the tool to see every request this tab makes.
Your files are processed on this device and never sent to a server. Reload the page to clear everything from memory.
The files people combine are the ones they least want on a stranger's server: signed contracts, bank statements, medical letters, ID scans for a visa application. This page joins them with pdf-lib inside your browser, copying every page into a new document with its fonts, images and links intact. The combined PDF is written on your device and downloaded from there.
Add the files in any order and use the arrows to arrange them; the result follows the list top to bottom. There is no limit set by this page on the number of files or their size beyond your device's memory, and there is no daily quota because there is no server keeping count.
How it works
- Drop two or more PDF files, or tap to pick them.
- Arrange them with the arrows. The combined document follows the list top to bottom.
- Combine, and the single PDF downloads.
In your browser, not on a server
pdf-lib, an open-source PDF library written in TypeScript, opens each document in your tab and copies its pages into a new PDF, preserving text, vector graphics, links and images as they are. The merged file is assembled in memory and handed to your browser’s download. Password-protected PDFs are unlocked first by qpdf, compiled to WebAssembly and loaded only when needed; the password is checked in your tab and the result is saved without encryption.
Compared with upload-based tools: Upload-based mergers cap the number of files, the total size, or the number of merges per day. This one is bound by your device’s memory (phones hold less), and your contracts, statements and scans are never copied to anyone’s server.
Verify it yourself. Give the page a short while after one visit to save itself for offline use, then turn off Wi-Fi or switch to airplane mode and run the tool again. Or open your browser's developer tools (F12, or Cmd-Option-I on a Mac), pick the Network tab, and watch it while you convert. The panel above does the same count for you.
Questions
Are bookmarks, links and form fields kept?
Pages are copied with their content, fonts, images and internal links. Bookmarks (the outline) and form fields are not carried across in the current version.
Can I combine only some pages of each file?
Extract the pages you need first with the split tool, then combine the extracts.
Why is the combined file smaller or larger than the sum?
Slightly smaller is normal, because shared resources are written once. Larger is unusual and means a source file had unused objects the copy kept; the compress tool's lossless cleanup will fix it.
Is the file uploaded anywhere?
No. There is no server in this process. The page is a static file and the work is done by code running inside your browser tab. Give the page a short while after one visit to save itself for offline use; then you can turn off Wi-Fi and it still works.
More PDF tools
Merge PDF
Combine PDFs into one document and set the order with the arrows. No watermark, nothing uploaded, and the size limit is your device’s memory (phones hold less).
File Checksum
Get a file's checksum on your device and compare it with the one the publisher lists.
JSON ↔ CSV
Paste or drop your data, choose a direction and get a table or an array back. What you paste stays on this device.
Split PDF
Pull out the pages you need, or break a document into single pages. Done on your device.
Other conversions
Guides
- Is it safe to merge PDFs online?It depends on one thing: whether the file leaves your computer. Here is how to tell, and how to merge without it leaving.
- How to merge PDFs on an iPhoneThe Files app can do this, though the steps are not obvious. Here they are, plus a faster option when you need to reorder pages.
- A free Sejda alternative with no hourly task limit and no uploadSejda's free web tools stop you after 3 tasks an hour, and the PDF goes to its servers. Here is what changes when the file never leaves your device.
- Is iLovePDF safe?iLovePDF is an established European service with good published practices. For confidential PDFs, the safer question is whether they need to be uploaded at all.
- Is PDF24 safe?PDF24 is a long-standing German project, and it tells you itself that its offline app is the more private option. Here is how to choose between the two, and a third way.