Merge PDF Files Online — Free & Private
Billu's PDF Merger combines multiple PDF documents into a single file using pdf-lib, running entirely in your browser. Drag in your PDFs, reorder them by dragging rows up or down, and download your merged document instantly.
Common use cases
- Combine chapters into a single ebook
- Merge invoices into one PDF for accounting
- Assemble a portfolio from separate documents
- Combine scanned pages into one file
Frequently Asked Questions
Are my PDFs uploaded anywhere?
No. pdf-lib runs in your browser. Your files never leave your device.
Is there a file size limit?
There is no server-side limit. Very large files may be slow depending on your device RAM.
Do password-protected PDFs work?
Not currently. Unlock your PDFs first before merging.