Merge PDF files
Combine two or more PDFs into one document, in the order you choose — free, with no sign-up, and without your files ever leaving this device.
Runs on your device. Your file is never uploaded.
How to merge PDFs, step by step
- 1
Choose the PDFs you want to combine
Tap "Choose PDFs" and select two or more files — up to 50 at a time. On a phone you can pick them from Files, iCloud Drive or Google Drive; on a desktop hold Ctrl or Cmd to select several at once. You can tap the button again to add more files later, and remove any file with the × beside its name. Picking the same file twice adds it once — the tool says so rather than quietly doubling its pages.
- 2
Put them in the right order
The merge order list shows the exact order the finished document will follow, top to bottom. Use the up and down arrows to move a file — there is no drag and drop to fight with on a touchscreen. Page 1 of the merged PDF is page 1 of whichever file sits at position 1.
- 3
Tap Merge PDFs
The merge runs on your own device using your browser, so it takes a second or two for a handful of small files and a little longer for a big scan. Nothing is uploaded and no progress bar is waiting on a server.
- 4
Download it, or turn it into a shareable link
Your merged PDF appears with a Download button. It is named after the first file you picked, with "-merged" on the end. Download it first — then, if you need to send it to someone, "Share it as a link" takes you to the uploader, where that merged file becomes a clean URL plus a QR code. Whoever you send it to needs no account and no app to open it.
Your file never leaves your device
Most merge tools work by uploading your document to their server, combining it there and sending a file back. This one doesn’t. The merge runs inside this browser tab: your PDFs are read straight from your disk, joined together in the tab’s own memory, and returned to you as a download. Nothing is transmitted, so there is no upload queue, no temporary copy sitting on someone’s server, and no retention policy you have to take on trust.
That matters most for the documents people actually merge: contracts, payslips, medical letters, bank statements, signed agreements. You can even go offline after the page has loaded and the merge still works — which is the simplest proof that nothing is being sent anywhere. If you later choose Share it as a link, that step does upload the merged file, because a link needs somewhere to point — but that is a separate, deliberate tap.
The honest limits
Running on your device is the whole advantage, and it is also where the limits come from. The files you pick have to add up to 40 MB or less, and there can be at most 50 of them, because a parsed PDF occupies several times its file size in memory and a phone browser quietly kills a tab that asks for too much. Refusing up front with a message is better than freezing halfway through.
- Over 40 MB? Merge in two batches, then merge the two results — the output of one pass is a normal PDF you can feed back in.
- Password-protected PDFs are refused. Save an unlocked copy first rather than getting back a file that won’t open.
- Bookmarks and form fields don’t survive. Pages, text and images do. Keep the original if it is a fillable form.
- A big merge takes a moment. A job near the 40 MB ceiling on an older phone can block the tab for several seconds. That is your hardware working, not a stalled upload.
- Sharing is a separate step. Merging gives you a file to download. Turning that file into a link means uploading it, which needs a free account — and that is the one moment anything leaves your device.
Questions about merging PDFs
Are my PDFs uploaded to a server when I merge them?
No. The merge happens inside your browser tab using your device's own processor and memory. Your files are read from disk, combined in memory, and handed back as a download — no bytes are sent to Link in Seconds or anywhere else, and there is no copy of your document to delete afterwards.
How many PDFs can I merge at once, and how big can they be?
Up to 50 files in one go, and they have to add up to 40 MB or less. Both ceilings exist because the tool runs on your device rather than on a server: a PDF takes several times its file size in memory once it is parsed, and every extra file is another document to open. If you are over either limit, merge in two batches and then merge the two results — the output of one pass is an ordinary PDF you can feed straight back in.
Does merging reduce the quality of my PDFs?
No. Merging copies each page object across into a new document exactly as it was — the images, fonts and vector text are untouched, nothing is re-encoded and nothing is compressed. The merged file is roughly the sum of the originals in size, which is expected, not a bug.
Can I merge a password-protected PDF?
Not directly. An encrypted PDF is refused with a clear message rather than merged into a file that would later fail to open. Open the PDF in a reader with its password, save or print it to a new unlocked copy, and merge that copy instead.
What happens to bookmarks, form fields and links in the merged file?
Page content, text, images and page size are all carried over faithfully. Document-level extras are not: bookmarks or outlines, interactive form fields, and internal jump-to-page links are generally dropped or left pointing nowhere. For a set of scans, reports or invoices that makes no practical difference; for a fillable form, keep the original.
Do I need an account, and is there a watermark or a daily limit?
No account, no watermark, no daily cap on merging. Because nothing is processed on a server there is nothing to meter, so you can merge as often as you like. A free account is only needed for the separate, optional step of turning the merged file into a shareable link.
Sending the result to someone
Merging is often step one — step two is getting the document to a client, a landlord or an admissions office. If the merged file is heavy enough to bounce off an inbox, the guide on how to send a large PDF covers the 25 MB email wall and what actually gets past it. And if merging wasn’t really what you wanted — you just need someone to receive several documents at once — read how to share multiple PDFs as one link instead. Keeping the files separate means each one stays individually named and downloadable, which is usually friendlier than a 90-page merged file.
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