About this tool
Combining PDFs — a scanned form and a cover letter, or several chapters of a report — usually means installing desktop software or trusting a third-party upload service. This tool merges PDF files directly in your browser using pdf-lib, an open-source PDF library, so your documents never leave your device.
How to use it
- 1Click the upload area or drag two or more PDF files onto it.
- 2Reorder files using the up and down arrows — they'll be merged in the order shown.
- 3Click "Merge PDFs" to combine them into a single document.
- 4Download the merged PDF.
Common mistakes to avoid
- Trying to merge a password-protected or encrypted PDF, which will fail until it's unlocked first.
- Forgetting to reorder files before merging, resulting in pages in the wrong sequence.
- Assuming form fields or interactive elements always survive a merge — complex PDF features can behave differently after combining.
Use cases
- Combining a cover letter, resume, and portfolio into a single PDF for a job application.
- Merging scanned pages into one document.
- Assembling multiple reports or invoices into a single file to send.
Frequently asked questions
Are my PDFs uploaded to a server?
No. Merging is done entirely in your browser using pdf-lib, an open-source JavaScript library. Your files never leave your device.
Is there a limit to how many PDFs I can merge?
There's no hard-coded limit, but very large files or a large number of files may be limited by your browser's available memory.
Can I merge password-protected PDFs?
Not directly. Remove the password protection from each file first using a PDF editor, then merge them here.