Merge PDF
Combine multiple PDFs into one file
Merge PDF: Without Your Files Ever Leaving Your Device
Contract + annexes + signature page → one PDF. No uploads, no limits.
Application packages, contract bundles, invoices, lecture notes — the need to combine several PDFs into one is everywhere. Most popular PDF sites upload your file to their servers for this job; not a comfortable thought for documents containing contracts or IDs. This tool works differently: merging happens inside your browser using pdf-lib technology — your files never touch the internet. Drag your PDFs in, arrange their order with the arrow buttons, merge and download. There's no file count or size limit; speed depends only on your device. The result downloads as merged.pdf, with the total page count and size shown when done.
Features
No Upload
Merging runs on your device — documents never travel.
Reorder
Arrange the file order with arrows before merging.
Unlimited
No file count or size limits, completely free.
Fast
No upload wait — the job takes seconds.
PDF Merge Guide
How to use
- Drag PDFs in or click to choose (multi-select supported)
- Set the merge order with the ↑ ↓ buttons
- Remove unwanted files with ×
- Hit Merge and download the single PDF
Good to know
- Pages keep their original size and orientation
- Password-protected PDFs may fail to open — remove the password first
- Result size ≈ sum of inputs (no recompression)
- At least 2 files are required
Frequently Asked Questions
Are my files uploaded to a server?
No — that's this tool's core difference from other PDF sites. Merging runs entirely on your device via the pdf-lib library in your browser; your documents never touch the internet. Contracts, IDs and invoices are safe to merge.
How many files can I merge — is there a limit?
No artificial limit. Since processing happens in your device's memory, the practical limit is your hardware — a modern computer handles dozens of files and hundreds of pages comfortably.
How do I change the file order?
With the ↑ and ↓ buttons next to each file. Merging follows the order you see in the list; the numbers show the current order.
Can I merge password-protected PDFs?
Some files with view passwords open fine, but edit-restricted ones may fail. The reliable path is to remove the PDF's password first, then merge.
Does merging lose quality?
No — pages are copied as-is; text, images and vectors are preserved exactly. Since there's no recompression, the result is about the sum of the sources.
Will the page order get mixed up?
No. Each file's own pages stay in their internal order, and files are appended in exactly the order you set.