Merge PDF
Combine multiple PDF files into one document — free, private, in your browser.
Combining multiple PDF files into a single document is a common need for reports, applications, and archives. This tool merges any number of PDFs in your chosen order, entirely in your browser using JavaScript. No file leaves your device — the merged PDF is assembled locally and downloaded directly.
Drop PDF files here or click to upload
Select multiple PDF files — drag to reorder after uploading
How to Merge PDFs
- Upload PDFs — drag & drop or click to select multiple PDF files.
- Reorder — drag files up/down to set the merge order.
- Merge & Download — click the button to combine all PDFs into one file.
Frequently Asked Questions
Are my files uploaded to a server? ▼
No. All merging happens in your browser using pdf-lib.js. Your PDF files never leave your device — they are processed 100% locally.
Is there a page or file limit? ▼
No hard limit. It depends on your device's memory. Most devices can merge dozens of PDFs with hundreds of pages without issues.
Does merging affect quality? ▼
No. Pages are copied as-is from the original PDFs. Text, images, and formatting are preserved exactly.