How to merge PDF files
Select two or more PDFs, arrange them with the up/down arrows, and click Merge. You get a single combined PDF, with all pages in the order you chose.
Are my documents safe?
Safer than any "upload" site: your PDFs never leave your device. The merge happens inside your browser's memory, which makes this tool suitable even for contracts, ID documents and other sensitive paperwork.
Limits
Because everything runs on your own device, very large PDFs ( hundreds of MB) depend on your device's memory. Typical documents — even long ones — merge in a second or two. Password-protected PDFs must be unlocked first.