Merge PDF
Combine several PDFs into one file, in the order you drop them.
PDF documents Client-side pdf-lib
Tool preview
How to use it
- 01
Drop two or more PDFs.
- 02
Reorder by dropping them again if needed.
- 03
Press Merge and download.
Limitations
- ! Encrypted PDFs are skipped or fail — unlock them first.
- ! Everything is assembled in memory, so very large batches may be slow on low-memory devices.
FAQ
Are bookmarks and forms preserved?
Page content is preserved; interactive forms and bookmarks are not merged.
Is there a page limit?
No fixed limit, but the whole batch must fit in browser memory.
Does merging reduce quality?
No. Pages are copied as objects, not re-rendered.
Files never leave your device
Processing happens in your browser using the File API, WebAssembly and Web Workers. There is no upload endpoint.
Technical details
- Processing
- Client-side
- Implementation
- pdf-lib
- Category
- PDF documents
- Network requests
- None while processing