Merge PDF
Combine multiple PDF files into one document
Drop PDF files here or click to browse
Max file size: 50MB
How to merge pdf online
Combine multiple PDF files into a single document in just a few clicks. Everything runs in your browser — no uploads, no signups.
- Select multiple PDF files by clicking the upload area or dragging files onto it.
- Arrange your files in the desired order using the file list.
- Click "Merge PDFs" to combine them into one document.
- Download your merged PDF file instantly.
About Merge PDF
PDF merging is the process of combining two or more separate PDF documents into a single file. It is one of the most common PDF operations people need, whether you are assembling a report from multiple sections, combining scanned pages into one document, or packaging related files together before sending them to someone.
Most online PDF merge tools require you to upload your files to a remote server, which raises privacy concerns — especially when dealing with contracts, tax documents, medical records, or other sensitive material. This tool works entirely in your browser using a library called pdf-lib. Your files never leave your computer, and no data is sent over the internet during the merge process.
The merged output preserves all page content from each source file, including text, images, and vector graphics. Pages are copied in the exact order you arrange them. The tool supports files up to 50 MB on desktop and 20 MB on mobile, which covers the vast majority of everyday PDF merging needs.
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Frequently Asked Questions
How does PDF merging work?
Your PDF files are combined directly in your browser using pdf-lib. Pages from each file are copied into a new document in the order you select. No files are uploaded to any server.
Is there a file size limit?
Each file can be up to 50MB on desktop or 20MB on mobile devices. This limit exists because processing happens in your browser memory.
Will my merged PDF keep bookmarks and links?
Basic page content, text, and images are preserved. Bookmarks and interactive form fields may not transfer between documents.
Can I merge password-protected PDFs?
No. Encrypted or password-protected PDFs cannot be processed in the browser. You will need to remove the password first.