How to merge PDFs in your browser
- Drop two or more PDF files into the box above, or click to choose them.
- Drag the rows (or use the ↑/↓ buttons) to reorder the files. The merge follows the visible list order from top to bottom.
- Click Merge PDFs. The combined PDF downloads instantly — nothing is uploaded to a server.
What this tool does
The merge tool takes the pages from each input PDF, in the order you choose, and writes them out as a single new PDF. Page sizes, embedded fonts, and orientation are preserved from the original files. Bookmarks and form fields are not copied across (a known limitation of browser-side PDF tooling).
Privacy
Every step happens locally inside your browser tab. The PDFs never travel to a server, and there is no signup or account requirement. You can confirm this by opening your browser's network tab — no upload requests are made when you click Merge.
Limits
- File size: 100 MB per file. Browsers struggle past that because the entire PDF must be parsed in RAM.
- File count: up to 50 files in one merge.
- Encrypted PDFs: PDFs with no owner password load fine. Files with a real user password must be unlocked first.
FAQ
Will the order of pages match the order of files I added? Yes — files are concatenated in the visible list order, and within each file the pages stay in their original order.
Are bookmarks preserved? No. pdf-lib (the underlying browser library) does not yet copy outline entries between documents.
Does the merge re-encode page contents? No. Pages are copied byte-for-byte where possible, so visual quality is identical to the source.