Merge PDF Files
Combine multiple PDF files into one, free and without uploading — merging happens entirely in your browser, so your documents stay private.
- ✓ Runs in your browser — nothing uploaded
- ✓ No sign-up
- ✓ Free, no limits
This free tool merges PDF files into a single document without uploading anything: pick two or more PDFs, put them in the order you want, press Merge, and download the combined file seconds later. Unlike most “merge PDF online” sites, your documents are never sent to a server — the entire merge runs inside your browser, which you can verify by watching the network tab or even switching off your Wi-Fi after the page loads.
That privacy difference matters for exactly the files people merge most: contracts, invoices, scans of IDs, medical documents and application paperwork. With server-based tools you are trusting a stranger's machine with those pages; here they never leave your device. There is no signup, no watermark, no page limit beyond your device's memory, and the order you list the files is the order their pages appear in the result.
Use it to combine scanned pages into one document, assemble reports from separate exports, or bundle an invoice with its receipts. Each file keeps its original page size and content — the tool copies pages exactly as they are, without recompressing or altering them.
Frequently asked questions
Are my PDF files uploaded to a server?
No. The merge runs entirely in your browser using the pdf-lib library — you can turn off your internet connection after the page loads and merging still works. Nothing is transmitted, logged or stored.
How do I control the page order?
Files are merged in the order shown in the list. Add them in the order you want, or remove and re-add a file to move it to the end.
Is there a file size or page limit?
There is no artificial limit — the practical limit is your device's memory. Typical documents of hundreds of pages merge in seconds; very large scanned files may take longer on older phones.
Does merging change the quality of my PDFs?
No. Pages are copied exactly as they are, with no recompression — text stays sharp and images keep their original resolution.