Most online PDF mergers upload your document to a server, process it there, and ask you to trust that the copy is deleted afterwards. This one does the work inside the page itself. Your file never leaves the machine you are sitting at, which is why there is no upload wait, no queue, and no file size cap imposed by someone else's disk.
How to use the Merge PDF
- Drop two or more PDFs onto the upload area, or click to choose them
- Use the arrows to put the files in the order you want
- Click Merge
- Download the combined document
Why local processing matters for PDFs more than most files
PDFs are disproportionately likely to be sensitive. Contracts, invoices, medical results, bank statements, identity documents, signed agreements — these are exactly the documents people need to merge, and exactly the ones that should not be handed to an unknown third party.
Uploading creates obligations you cannot verify. You cannot confirm deletion, you cannot audit who had access while it sat on their server, and if that provider is breached your document is part of it. For anything covered by GDPR, HIPAA or a client confidentiality agreement, that transfer may itself be the problem regardless of what happens next.
Processing locally removes the question entirely. There is nothing to delete because nothing was ever sent.
Page order and what is preserved
Files merge in the order shown in the list, and pages within each file keep their original sequence. Use the arrows to reorder before merging — it is much easier than fixing the order afterwards.
Each page keeps its own size and orientation. Merging an A4 report with a landscape spreadsheet produces a document containing both, rather than forcing everything to one size. Existing page rotation is carried through too.
What does not carry over: bookmarks, form fields, annotations, and digital signatures. Signatures in particular are invalidated by any modification — that is the entire point of a signature — so a signed PDF should be merged only if you no longer need the signature to verify.
Frequently asked questions
Are my PDFs uploaded to a server?
No. The merge runs entirely in your browser using JavaScript. Your files never leave your device — you can disconnect from the internet after the page loads and it still works.
Is there a file size limit?
No server-side limit, because there is no server involved. The practical ceiling is your browser's memory — documents of a few hundred megabytes are fine on a normal machine.
Will the merged PDF have a watermark?
No. Nothing is added to your document. The output contains your pages and nothing else.
Can I merge a password-protected PDF?
Not directly. Encrypted PDFs are rejected with a clear message rather than producing corrupt output. Remove the protection first using the application that created it.
Do bookmarks and form fields survive?
No. Merging preserves page content, size and rotation, but drops bookmarks, interactive form fields, annotations and digital signatures. Signatures are invalidated by any edit regardless of the tool used.
How many files can I merge at once?
There is no fixed limit. Add as many as you need — the constraint is available memory, not an artificial cap.