Merge PDF
Join several documents into one file, in whatever order you choose.
Runs on your device · one of 15 free tools
Files are read straight from your disk. Nothing is sent anywhere.
How to merge PDF files
- 1
Add your PDFs
Drop all the files onto the tool at once, or click to browse and multi-select. Each document appears as a card showing its first page and page count, so you can see what you're working with rather than guessing from filenames.
- 2
Put them in order
Drag a card to move it. On a phone, use the arrows on each card. The number badge on every card is its final position, and the preview below always shows the combined document in the current order.
- 3
Check the seams
Scroll the preview to where one document ends and the next begins — that's where an ordering mistake shows up, and it's easy to miss if you only glance at the first page.
- 4
Join and download
Click Join documents and save merged.pdf. Your original files aren't modified; the merged file is a new document.
What merging actually does
Merging copies the page objects from each source document into a new file. Nothing is re-rendered or re-encoded: text remains real, selectable text, images keep their exact original bytes, and internal links keep working. The merged file's size is roughly the sum of its parts, and its quality is identical — there's no compression step hiding in the middle.
Two caveats worth knowing. Document-level bookmarks don't always survive, because two source files can define conflicting outlines. And form fields can collide when two documents each contain a field named, say, 'Signature' — most readers handle this gracefully, but if the merged form behaves oddly, that's why.
Why this merger doesn't upload your files
The documents people merge most are exactly the ones they'd least like on a stranger's server: bank statements for a mortgage application, medical records for a claim, identity documents for a visa. On a typical PDF site, all of those travel to a server, get combined there, and come back — with the operator's deletion policy as your only protection.
Here the browser does the work itself. Files are read from your disk with the File API, combined in memory, and handed back as a download. You can verify this rather than trusting it: open your browser's Network tab while merging and watch for an upload that never happens, or load the page, switch off your wifi, and merge anyway.
Handling the awkward cases
Password-protected files can't be merged directly — their pages are unreadable while encrypted. Remove the password first with the Unlock tool, merge, then re-protect the finished document if you need to.
Very large jobs are limited by your device's memory rather than by us: dozens of ordinary documents merge comfortably, but hundreds of heavy scans on an older phone will struggle. If the result needs to fit an upload limit afterwards, run it through Compress — it shrinks the images inside the file while leaving your text sharp.
Frequently asked questions
How many PDFs can I merge at once?
There's no imposed limit — no three-file cap, no page ceiling. Because the work happens on your device, the practical limit is your machine's memory. Dozens of typical documents are fine; hundreds of large scans on an old phone will be slow.
Does merging reduce the quality of my PDFs?
No. Pages are copied without re-encoding, so text stays sharp and selectable and images keep their original resolution. The merged file is not compressed unless you compress it yourself afterwards.
Can I change the order of the files?
Yes — drag the cards into any order, or use the arrow buttons on touchscreens. The preview underneath always reflects the current order, so what you see is exactly what downloads.
Can I merge a password-protected PDF?
Not while it's encrypted. Remove the password with the Unlock tool first (you'll need to know it), merge, then add protection back to the combined file with the Protect tool.
Are my files uploaded to a server?
No. The merge runs inside your browser and nothing is transmitted. You can confirm it: open developer tools, watch the Network tab while merging, or simply disconnect from the internet after the page loads — the tool keeps working.
Can I merge images and PDFs together?
Convert the images first with the JPG to PDF tool — it turns photos into PDF pages — then merge that result with your other documents here.