PDF Merger – Combine PDF Files Online Free
Combine two or more PDFs into a single document right in your browser — safe for contracts, invoices and anything confidential.
Free plan: up to 5 files per batch · quality capped at 80% · watermark: none · sign-in for higher limits is coming soon
Drop files here
or click to browse · up to 30 MB per file
Files are processed entirely in your browser and are never uploaded to a server.
How the PDF merger works
The tool reads each PDF with the pdf-lib library inside your browser, copies every page in file order, and writes a new document to download. Because everything is local, sensitive documents — contracts, payslips, IDs — never leave your machine.
Getting the page order right
- Files are appended top to bottom in the order they appear in the list.
- To control the order, rename files with number prefixes (01-contract, 02-schedule, 03-appendix) before selecting them.
- Check the summary line after merging — it reports how many files and pages went in.
Good to know
- Each PDF can be up to 30 MB.
- Password-protected files cannot be merged — remove the protection in the app that created them first.
- Scanned PDFs merge fine; pages are copied exactly as they are.
Typical merges
- Contract.pdf + Schedule.pdf + Appendix.pdf → merged.pdf, one attachment for signature.
- 3 monthly bank statements → a single 12-page file for an accountant.
- Invoice + proof of payment → one combined document for a refund request.
Frequently asked questions
How do I merge PDF files into one?
Select two or more PDFs, check the order in the file list, then click merge. The combined PDF downloads instantly — pages are copied in the exact order the files are listed.
Can I control the page order of the merged PDF?
Yes — files are appended top to bottom in the order they appear in the list. Rename your files with number prefixes (01, 02, 03) before selecting them to get the order you want.
Is it safe to merge confidential PDFs here?
Yes. Merging happens entirely in your browser; the files are never transmitted to a server, so contracts, invoices and IDs stay on your machine.
What is the file size limit?
Each PDF can be up to 30 MB. Larger files may exhaust memory on mobile devices, so split very large documents before merging on a phone.