Merge PDF
Combine multiple PDF documents into a single organized file in seconds.
Start using Merge PDF
Your files stay strictly inside your browser. No files are uploaded to any server or cloud storage.
Open in Studio WorkspaceHow to use Merge PDF
1. Select PDF Files
Choose two or more PDF documents from your device.
2. Arrange Order
Drag and drop or sort files in the desired reading order.
3. Merge & Download
Click "Process & Download" to instantly assemble your merged document.
Technical Architecture & Privacy
Merge two or more PDF files directly inside your browser. No files are uploaded to any server. Everything is processed locally in memory using WebAssembly and Web Workers.
Unlike conventional PDF websites that send your personal tax forms, legal agreements, and corporate contracts to third-party cloud infrastructure, PDFolio operates under a Zero-Server Architecture. Your documents are decoded into pure memory buffers (Uint8Array) inside your browser's dedicated JavaScript runtime or Web Worker. When you click download, the newly assembled PDF is produced directly from memory into your Downloads folder.
Frequently Asked Questions
Are my PDF files uploaded to a remote server?
No. PDFolio processes all files directly in your browser using pure client-side JavaScript. Your files never leave your computer.
Is there a file size limit?
The only limit is your browser available memory (RAM). Most modern computers comfortably handle documents with hundreds of pages.
Can I reorder pages after merging?
Yes, you can transition directly into the Organize tool to reorder, rotate, or delete individual pages.