🧷 Merge PDF Files
Combine PDFs into a single file, in your order — locally, which matters, because the documents people merge are contracts, IDs and medical records.
How the merge pdf files works
Each source PDF is parsed in browser memory and its pages are copied, in your chosen order, into a fresh document that you download. Every file you add shows a live first-page thumbnail and its page count, so you can see at a glance what you're combining and in what order before you merge. This is a structural operation — pages are transplanted intact, so text stays selectable, links keep working and quality is untouched, because nothing is rasterized or re-compressed.
Why local processing is the whole point here: PDF merging is the classic "free online tool" that receives people's leases, tax forms, passports and signed contracts onto someone else's server. Here the files stay in your browser's memory — disconnect from the internet and the merge works identically.
Frequently asked questions
Does merging reduce quality?
No — pages are copied structurally, not re-rendered. Text remains selectable and sharp at any zoom, images keep their original compression, and internal links continue to work.
How do I control the page order?
Files are merged in list order, and you can move each file up or down before merging. Pages within each file keep their original sequence.
Is there a file count or size limit?
No fixed limit — the constraint is your device's memory, since everything happens locally. Dozens of files and hundreds of pages are routine; multi-hundred-megabyte scans depend on your machine.
Can I merge password-protected PDFs?
Encrypted PDFs can't be read without their password, so they fail to load. Remove the protection in your PDF viewer first (open with password → save a copy), then merge.
Are my PDFs uploaded?
No — parsing and merging run in your browser via the pdf-lib library. The files never leave your device; the tool works with networking disabled.