Merge PDF
Join several documents into one file, in whatever order you choose.
Files are read straight from your disk. Nothing is sent anywhere.
How to Merge PDF Files
Drop your files into the tool above, arrange them in the order you want, and click "Merge." Your combined PDF is ready to download instantly.
Unlike other online PDF mergers, LockedPDF never uploads your files to any server. Everything is processed locally in your browser.
Frequently Asked Questions
Can I merge more than 2 PDFs at once?
Yes! You can merge as many PDF files as you want. Just drop them all into the tool or click 'Add more files'.
Does merging reduce quality?
No. LockedPDF copies pages directly without re-encoding. Your merged PDF has identical quality to the originals.
Are my files uploaded to a server?
Never. Everything runs in your browser. Your files never leave your device — that's the LockedPDF promise.