What this tool does
Select two or more PDF files and combine them into a single PDF, in the exact order you selected them — no installation, no uploading to a server, no account needed.
A real, worked example
Merging a real 2-page PDF followed by a real 3-page PDF produces a single output with 5 pages — every page from the first file, in order, followed by every page from the second. If you select more than two files, the same rule applies across all of them: output order always follows selection order.
Order matters — and is entirely in your control
The files you select are listed in the order they'll appear in the merged PDF. There's no re-sorting by filename or date — you choose the order by the order you select files in, so double-check the list before merging if the sequence matters.
What happens with a problem file
If one of your selected files can't be read — it's corrupted, or it's password-protected — the tool tells you specifically which file caused the problem, rather than failing with a generic error that leaves you guessing which of several files was at fault.
Size limits
There's a combined size limit across all the files you're merging, set generously enough for ordinary documents while keeping the whole operation fast and reliable entirely in your browser.
What this tool doesn't do
This tool merges existing PDFs — it doesn't edit page content, reorder pages within a single already-merged file after the fact, remove individual pages, or convert other file formats into PDF first (JPG to PDF and Word to PDF handle those separately). If you need to split a merged file back apart later, PDF Splitter is the tool for that.
Privacy
Your PDF files are merged entirely in your browser's memory. They are never uploaded, transmitted over the network, or stored anywhere — not even temporarily.