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Burrows Tools

Merge PDF

Drop in the PDFs you want joined, drag them into the right order, and download one file. Every other merger on the first page of Google — iLovePDF, Smallpdf, Adobe — asks you to upload your documents to their servers first. This one does not, and cannot: the merging code runs in this tab, on your machine, and no request carries a byte of your file anywhere. That is the difference that matters when the documents are a signed contract, a set of payslips, medical letters, or a passport scan you are sending to a landlord. There is no queue, no account, no daily limit and no file sitting on somebody else's disk afterwards. Each page keeps its own size and orientation, so A4 portrait and US Letter landscape pages survive the merge exactly as they were rather than being squeezed onto one page size. Page counts appear beside each file as it is read, and a password-protected or damaged file is named rather than quietly dropped.

Drop your PDFs here

Or choose them below. Your files are read, merged and downloaded by this tab — they are never uploaded, and no copy is kept anywhere.

Up to 30 files, 100 MB each and 200 MB in total.

How to use the merge pdf

  1. Drop your PDFs onto the box, or choose them with the file picker — up to thirty at a time.
  2. Check the page count that appears beside each file, and remove anything you did not mean to add.
  3. Put them in order with the up and down buttons, or by dragging a row.
  4. Press Merge PDFs. The combined file downloads straight from this tab.

Frequently asked questions

Are my PDFs uploaded anywhere?
No. Your files are read, merged and saved by JavaScript running in this tab. No request carries their contents, there is no server-side copy to delete, and the page works with your network disconnected once it has loaded. The only thing the page fetches is the merging library itself — a 180 KB file served from this site the first time you add a PDF — and your document is not part of that request.
Is it safe to merge a PDF online?
It depends entirely on where the merging happens. A hosted merger uploads your document to a server you do not control, which is a real problem for a contract, a payslip or anything with a signature on it: you are trusting a retention policy you cannot verify. Here the file never leaves your device, so there is nothing to retain. That is a property of how the page is built, not a promise in a policy.
What happens to a password-protected PDF?
It is named and skipped rather than silently dropped, because an encrypted PDF cannot be opened without its password and producing a merged file with unreadable pages in it would be worse than saying so. Open it in a PDF reader with the password, save an unprotected copy, and merge that instead.
Is there a size or page limit?
Thirty files, 100 MB each, 200 MB in total, and 10,000 pages in the finished document. Those limits are your browser's memory rather than an upload allowance — everything is held in this tab while it works — and going over one of them shows a message rather than crashing the page.
Will the merged file look different?
No. Pages are copied whole, along with their size, orientation and rotation, so nothing is re-rendered, re-compressed or resized. A mixed batch of A4 and Letter pages comes out as a document with both page sizes in it, which is what a PDF is allowed to have.

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