Is it safe to merge confidential documents here?

Yes, 100%. Processing happens strictly in your device's browser memory via pdf-lib. No document data is sent across the internet.

Is there a limit on how many PDFs I can combine?

There is no artificial server limit. Because processing uses your computer or phone's local memory, you can merge dozens of pages smoothly.

Does merging affect document resolution or formatting?

No. The vector fonts, high-resolution graphics, and embedded form elements are copied losslessly into the combined document stream.

Toolzia All-in-One Online Tools

⚡ 100% In-Browser Execution 🔒 Zero Server Uploads PDF Tools

Merge PDF

Combine multiple PDF documents into one single file in seconds with complete privacy.

Select or drop here

Processed 100% locally with pdf-lib. Zero uploads to any server.

100% Client-Side Privacy Guarantee

Unlike conventional online tools that transmit your files to cloud servers, this tool executes 100% locally inside your browser via WebAssembly, HTML5 Canvas, and Web Workers. Your sensitive documents, photos, and financial inputs never leave your computer or phone.