Merge PDF
Combine multiple PDF files into a single document, right in your browser.
About this tool
Select two or more PDF files and combine them into a single document, in the order shown below (use the arrows to reorder them first). Everything runs locally in your browser using the open-source pdf-lib library — your files are never uploaded anywhere.
Frequently asked questions
- Is there a file size or page limit?
- No hard limit, but very large PDFs (hundreds of MB) may be slow or run out of memory, since everything is processed in your browser's memory rather than on a server.
- Are my files uploaded anywhere?
- No — merging happens entirely on your device. Nothing is sent to any server.
- What if one of my PDFs is password-protected?
- Encrypted PDFs generally can't be read by this tool and will show an error — remove the password first (e.g. in Adobe Acrobat or your PDF reader) and try again.