Merge PDF Online - Combine Multiple PDF Files Instantly

Combine multiple PDF files into one single document in seconds. 100% free, private, and secure client-side PDF merger.

About This Tool

Easily merge multiple PDF files into a single organized document. Drag and drop to rearrange files or individual pages before combining. Because merging happens entirely within your web browser using WebAssembly, your documents are never uploaded to any cloud server.

Key Features & Benefits

  • Combine unlimited PDF documents into a single master PDF.
  • Interactive page-level and file-level reordering with live thumbnail previews.
  • 100% secure on-device processing: files never leave your computer or phone.
  • Fast processing with zero file size restrictions.

How to Use

  1. Upload two or more PDF files using the upload box or drag-and-drop.
  2. Drag files or pages to set your desired reading order.
  3. Click Process & Download to save your merged PDF document instantly.

Frequently Asked Questions (FAQs)

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

No, you can merge as many PDF files as your computer or mobile device memory permits.

Are my confidential PDF documents uploaded to the internet?

No. All PDF operations run locally inside your browser. No files are uploaded to any external server.