PDF Merger
Merge multiple PDFs into one — without uploading.
Drop PDFs here, or
Files stay on your device — nothing is uploaded.
About PDF Merger
Local PDF merger.
Most online PDF tools require you to upload your files to their servers. That's fine for public documents and questionable for anything else — contracts, invoices, ID scans, medical records. This merger combines multiple PDFs into one, in your browser, using pdf-lib. Your files never leave your device. Drag to reorder pages, merge, download.
What this merger does and doesn't do
Merges any number of PDFs into a single output, preserving every page's original quality (no re-rasterising, no compression of embedded images). Lets you reorder pages by drag and drop. Doesn't yet split PDFs, encrypt the output, or add OCR — those are separate operations and they're on the roadmap as separate tools.
Frequently asked questions
Quick answers to the questions people actually ask about PDF Merger.
Are my PDFs uploaded?
Are my PDFs uploaded?
No. Merging runs entirely in your browser using pdf-lib. Files don't leave your device. Useful when you're merging contracts, ID scans, invoices, or anything else you wouldn't want to upload to an arbitrary server.
Does it preserve form fields, signatures, or annotations?
Does it preserve form fields, signatures, or annotations?
Yes for form fields and annotations. Digital signatures don't survive the merge — combining two signed PDFs invalidates both signatures, which is a property of how PDF signatures work (the signature covers the entire document, and the document changes when you merge). If you need to preserve signatures, sign the merged document instead.
Is there a page limit?
Is there a page limit?
Practical limit is around 1000 pages total before the browser starts to chug. For larger merges, use a CLI tool like `qpdf` locally.
Can I reorder pages before merging?
Can I reorder pages before merging?
Yes — drag pages into the order you want before hitting merge. Drop a file in the middle of an existing arrangement and drag-handle it to the right position.