Merge PDF
Combine several PDF files into one, in any order. It runs in your browser, so the files are never uploaded.
Add the PDFs you want to combine, put them in the order you need, then merge. The files are read and combined inside your browser, so nothing is uploaded to a server and there is no limit on how many times you can do it.
How the merge works
The page runs pdf-lib, a PDF library written in JavaScript, inside your own tab. It starts a new empty document, then copies the pages of each file into it in the order shown in the list, so the order you set by dragging is the order you get. Pages are copied as they are, not redrawn: text stays text you can select and search, images are not re-encoded, and every page keeps its own size and rotation. A document with A4 and Letter pages in it stays that way. The result is saved as a new file named after the first one, with -merged added. All of this happens in the memory of the tab; nothing is sent to a server, so closing the page discards everything.
Limits, and what the merged file leaves out
You can add up to 50 files at a time, each up to 100 MB. There is no total size cap in the code, but the whole job is held in memory, so a long list of large scans can still run out of room, especially on a phone. A PDF that asks for a password before it will open stops the whole merge, and the message does not say which file it was: take the password off first with Unlock PDF. A file that only restricts printing or copying is merged normally, and the merged file comes out without those restrictions. Because the result is a new document, the title, author, bookmarks, form fields and page labels of the originals are not carried over, and links from one page to another inside a file no longer lead anywhere.
How to use it
- Add two or more PDF files by dropping, choosing or pasting them.
- Drag the handle next to each file to put them in the order you want.
- Press Merge PDF and download the combined file.
Why use this tool
Completely private
Everything runs inside your browser. Your files and text are never sent to a server.
Free, with no limits
No sign-up, no watermarks and no cap on how many times you can use it.
Instant results
There is no upload or queue to wait for, so results appear as fast as your device can work.
Works on any device
Runs in any modern browser on phone, tablet or desktop. Nothing to install.
Frequently asked questions
- Can I merge PDFs that have different page sizes?
- Yes. Each page keeps the size and orientation it had, so A4, Letter and landscape pages can sit in one file. If you want them all the same size afterwards, run the result through Resize PDF pages.
- Can I combine a PDF with photos or screenshots?
- This page takes PDF files only. Turn each picture into a PDF first with JPG to PDF or Image to PDF, then download those files and add them here.
- Can I merge PDFs on my phone?
- Yes, in a mobile browser and with nothing to install. Pick the files from the phone's storage, set the order and merge. Large scans are what can fail on a phone, because the whole merge is held in memory; if one does, merge the files in two or three smaller groups and then merge those results.
- Are my PDFs uploaded to a server?
- No. The files are read into your browser's memory and combined there using JavaScript. Nothing is sent over the network, nothing is stored, and no one else can see the documents. This makes the tool safe for contracts, passports, medical records and anything else you would not want to upload.
- Is there a limit on file size or number of files?
- Yes: up to 50 files per merge and 100 MB per file. Beyond that the limit is your device's memory, since everything is held in RAM while the document is built. A laptop copes with dozens of ordinary documents; very large scans on an older phone are the case most likely to struggle.
- Does merging reduce quality?
- No. Pages are copied across as-is, so text stays selectable, images keep their original resolution, and nothing is re-encoded. The merged file is normally close to the combined size of the originals.
- Can I merge password-protected PDFs?
- Files that only carry an owner password will usually merge. A PDF encrypted with a user password — one that asks for a password before it will open at all — cannot be read without that password, so it cannot be merged here.
- What happens to bookmarks and form fields?
- Page content, text and images are preserved exactly. Document-level features such as bookmarks, form fields and attachments are not carried into the merged file. If you need those, keep the originals as well.
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