PDF merge

Merge several PDFs into one (in your browser).

Select or drag & drop PDFs to merge (merged in order)

All processing happens in your browser; files are never sent to a server.

An expense claim wants one attachment and you have eleven receipts. A signed contract arrives as three separate scans. Combining PDFs is routine admin, but the obvious online tools ask you to upload documents that are often the last thing you would want on someone else's server. This one does the merge inside your browser instead.

How it works

Adding files and setting the order

Select or drop your PDFs and they appear as a numbered list — that is the order they will be merged in, first to last. Every page of file 1 comes before every page of file 2, and so on.

There is no drag-to-reorder. The × beside an entry removes it, and newly added files go to the end of the list, so the practical way to fix a sequence is to remove the out-of-place file and add it again once the ones before it are in place. Naming your files 01-…, 02-… before you start makes multi-file selections land in the right order to begin with.

Merging and downloading

Press Merge and the tool loads each document, copies its pages into a new one, and reports how many files and pages went in — worth a glance, since a wrong total usually means a file was added twice or dropped. Download then saves the result as merged.pdf.

The page size of each original is preserved, so mixing A4 and Letter, or portrait and landscape, gives a document whose pages differ in size. That is valid and prints fine, but it can look untidy on screen.

Limits worth knowing

Situation	What happens
Password-protected PDF	Load is attempted anyway; may fail with an error
Damaged or partial file	Merge stops and reports the failure
Bookmarks, form fields	Not carried across to the merged file
Very large documents	Held in memory — several hundred MB may strain a phone

Everything runs on your own device through a JavaScript PDF library loaded into the page. The files are read locally and never transmitted, which is what makes this safe for contracts, medical records and payslips. For anything legally sensitive, check the merged document page by page before sending it on.

Terms explained

Merge order: The sequence of the numbered list. Pages are appended file by file, so the first entry's pages open the merged document.
Page index: The internal position of each page within a source PDF. The tool copies every index from each file, so nothing is skipped.
Encrypted PDF: A file protected by a password or usage restrictions. The tool tries to read it regardless, but genuinely password-locked documents will fail to load.
Merged.pdf: The default filename of the download. Rename it after saving — most systems will otherwise overwrite the previous merge.
Client-side processing: Work done in your browser rather than on a server, so the file content never leaves your device.

Frequently asked questions

Are my PDFs uploaded to a server?

No. They are read into your browser's memory and combined there by a JavaScript library running in the page. Nothing is transmitted, which is why the merge still works with the network disconnected.

How do I change the order of the files?

The list order is the merge order, and files are added to the end. To move something earlier, remove entries with the `×` button and re-add them in the sequence you want. Numbering the filenames beforehand avoids the problem entirely.

Can I merge a password-protected PDF?

The tool attempts to open protected files, but a document that genuinely requires a password to be read will fail with an error. Remove the password in a PDF reader first, then merge.

What happens to bookmarks, form fields and signatures?

Only the pages are copied. Bookmarks, interactive form fields and digital signatures are not carried into the merged file — and a merge would invalidate a signature in any case, since it changes the document.

Is there a limit on file size or number of files?

No fixed limit, but everything is held in your device's memory. Merging a handful of ordinary documents is instant; several hundred megabytes at once may be slow or fail on a phone. Split large jobs into batches if you hit trouble.