PDF Merger — Free Online Tool
Upload up to 20 PDF files and merge them into a single PDF document. Drag to reorder files before merging. The merged PDF preserves original page content, fonts, and formatting. Powered by pdf-lib — no file is ever sent to a server.
100% client-side. No uploads. Your data never leaves your browser.
How to use PDF Merger
- Click 'Add PDFs' or drag and drop up to 20 PDF files.
- Drag the file rows to reorder them as needed.
- Click 'Merge PDFs' to combine them.
- Download the merged PDF from the output section.
Frequently Asked Questions
Are there restrictions on PDF content?
Password-protected PDFs cannot be merged unless you unlock them first. The tool will show an error for encrypted files.
Does merging preserve bookmarks and hyperlinks?
Page content and formatting are preserved. Bookmarks from individual PDFs are merged into the output. Internal cross-document hyperlinks may not work after merging.
Which library handles the merging?
pdf-lib, a pure JavaScript PDF manipulation library that runs entirely client-side.
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