Merge PDF
Combine multiple PDF files into one document. Reorder entire files or rearrange individual pages with drag & drop before merging. 100% in-browser — nothing is uploaded.
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Drop PDF files here or click to browse
Select 2 or more PDF files — No size limit
How to Merge PDF Files
- Click the drop zone or drag and drop your PDF files
- File Order mode: Drag file entries to reorder entire documents
- Page Order mode: Switch to see every page as a thumbnail — drag individual pages to set a custom order across all files
- Click Merge PDFs to combine them into one file
- The merged PDF will download automatically
Why Merge PDFs?
- Combine invoices — Bundle monthly invoices into a single quarterly or annual file
- Create portfolios — Merge individual project PDFs into one portfolio document
- Organize contracts — Combine multi-part agreements with appendices
- Simplify sharing — Send one file instead of multiple attachments
Privacy & Security
Your PDF files are processed entirely in your browser using the pdf-lib JavaScript library. No files are uploaded to any server. You can verify this by checking your browser's Network tab.
Frequently Asked Questions
The tool uses pdf-lib.js to combine your PDF files entirely within your browser. You select multiple PDFs, arrange them in the order you want, and the tool produces a single merged document. No files are uploaded to any server.
Yes. All processing is 100% client-side. Your PDFs never leave your device or get transmitted over the internet. This makes it safe for confidential contracts, financial statements, and other sensitive files.
Yes. The tool preserves each page's original dimensions and orientation. You can freely combine portrait A4 pages with landscape letter-size pages — every page keeps its original formatting in the merged output.
Yes. After selecting your files, you can drag and drop them into any order before merging. The final PDF will follow the exact sequence you set, so you have full control over the page arrangement.
There is no fixed limit. You can merge as many PDFs as your browser's memory allows. Most devices handle dozens of files with hundreds of total pages without any issues.