About PDF Merger
// Combine PDF files instantly offline
Merge multiple PDF files into a single document without upload. Arrange files in custom order, adjust page composition, and export high-quality combined PDFs in seconds. Runs 100% on-device inside your web browser sandbox using PDF-Lib WASM bindings.
100% On-Device Privacy Guaranteed
Unlike cloud conversion sites, your documents are processed locally inside your web browser sandbox. We do not collect user data, log operations, or upload files to external servers. Safe, secure, and private.
Tool Capabilities
- Drag-and-drop file reordering grid
- Super fast local WebAssembly client-side compilation
- Custom PDF file output naming controls
- No file size limits or wait time queues
- 100% offline secure client-side sandbox
- Free from watermarks, branding, or restrictions
How to Use PDF Merger
Follow these simple steps to process your files securely in-browser:
Select PDF files
Click Select PDF Files or drag and drop multiple PDF documents into the dropzone.
Arrange page ordering
Use the arrow buttons to arrange the files in your desired merge sequence.
Merge PDFs Instantly
Click the Merge PDFs Instantly button. The application combines the files client-side.
Save output document
Save the merged PDF file directly to your device storage.
Frequently Asked Questions
Common questions and answers regarding PDF Merger:
Is there a size limit to the PDF files I can merge?
No. Because the merging happens locally in your browser memory, there are no artificial file limits. It is limited only by your device's available system RAM.
Will merging PDFs online compromise my data security?
Not with ScanBox Pro. Since our tools process files entirely on-device, your documents never touch the cloud or our servers, making it 100% secure for corporate or personal files.
Can I merge other file formats into PDF here?
This tool is optimized for PDF files. If you want to merge images (JPG, PNG, WEBP) into a single PDF, please use our dedicated Image to PDF tool.
Split PDF
Extract specific pages or split your PDF documents into separate files privately on-device.
Protect PDF
Secure PDF files client-side. Set passwords and encryption to restrict editing and viewing.
Watermark PDF
Apply text or image stamps overlay on your PDF pages with custom position and transparency.