What merging does and doesn't do
Every page from every file is copied into a new PDF in the order the files are listed, keeping text as text and images at their original resolution — nothing is re-rendered, flattened or recompressed in the process.
It can't merge a PDF that's password-protected without first removing that protection, since the file needs to be readable to copy its pages. Unlock it first if that applies to one of your files.
Common questions
Does merging change the quality of my PDFs?
No. Pages are copied exactly as they are — text stays text, images stay at their original resolution. Nothing is re-rendered or re-compressed.
Can I merge password-protected PDFs?
Not directly — an encrypted PDF needs to be unlocked first. Use the Unlock PDF tool if you know the password, then merge the unlocked file.
Is there a limit to how many PDFs I can merge?
No fixed limit — it depends on your device's memory, since the merge happens entirely in your browser rather than on a server.