Merge PDF Files
Merge multiple PDF files into one for free. Arrange them as you like, then download the result instantly. Everything happens in your browser.
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How to Use
1
Upload Files
Upload PDF files from your device or drag and drop them directly.
2
Arrange Order
Drag files to reorder them as desired before merging.
3
Download Result
Click merge and download the combined PDF instantly.
Upload PDF Files
Important Info
- All files are processed locally in your browser — never uploaded to any server
- Merge up to 20 PDF files with a maximum size of 100 MB each
- Drag files to reorder them before merging
Drag & drop PDF files here
or
Accepts PDF files only
Added Files
0
Merging...
0%
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About This Tool
What is a PDF Merger?
A PDF merger is a free tool that lets you combine multiple PDF files into one complete document. The tool works entirely in your browser using the open-source pdf-lib library, meaning your files never leave your device.
How does it work?
The tool reads your PDF files and loads them into memory as ArrayBuffers, then uses the pdf-lib library to copy pages from each file into a new PDF document in the order you specified.
When do you need to merge PDFs?
- Combining chapters of a book or report from separate files
- Merging invoices or multiple documents into one file for sending
- Unifying presentations or various appendices into one document
Tool Features
Completely free with no usage limits. Works offline after page load. Supports drag & drop for file ordering. Shows page count per file. No software installation required.
Tip: If a PDF file is password-protected, the tool won't be able to merge it. Remove the protection first using a specialized tool.
References & Resources
Frequently Asked Questions about PDF Merge
Yes, absolutely. All merge operations happen locally in your browser. Your files are never uploaded or sent to any server or third party.
You can merge up to 20 PDF files. The maximum size per file is 100 MB. Performance may be affected by your browser's memory when handling very large files.
Yes, files are merged without any quality loss. Searchable text, images at original resolution, hyperlinks, and print properties are preserved.
The tool does not support encrypted or password-protected PDFs. An error will appear when trying to merge them. Remove the protection first.
Yes, you can easily reorder files by dragging and dropping them.
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