ShadowToolkit

PDF Merger (Combine PDFs)

Combine multiple PDF files into one document locally.

100% In-Browser
All-In-One PDF StudioMulti-Doc + Live Preview

Want to merge, watermark, compress, protect, delete pages & preview results side-by-side with ZIP exports?

Try PDF Playground
100% In-Browser PrivacyLocal

Your files and data are processed locally and never leave your device.

Select PDF files to merge

All processing runs 100% locally inside your web browser. Zero server uploads.

Max size: 300MB •100% In-Browser

What is PDF Merger (Combine PDFs)?

PDF Merger combines multiple independent PDF documents into a single, cohesive file. It reads PDF byte structures locally, resolves font references, and concatenates page trees in your chosen sequence without altering vector sharpness or text clarity.

Zero-Server Client-Side Guarantee

Unlike legacy online utilities that upload sensitive media and documents to remote cloud storage, Shadow Toolkit executes this entire operation directly within your browser's local runtime. Your raw data never crosses the network.

Key Capabilities

  • Merge unlimited PDF documents into a single organized file
  • Drag-and-drop file reordering to arrange document sequence effortlessly
  • Preserves original page orientation, vector graphics, and embedded text layers
  • High-speed client-side assembly using pdf-lib with zero cloud latency
  • 100% private in-browser operation with zero server uploads

Common Use Cases

1Combining resume, cover letter, and letters of recommendation into a single job application PDF
2Merging monthly bank statements, receipts, and invoices for annual tax filing
3Consolidating separate chapter drafts into a unified e-book or manual
4Organizing and preparing official business documents, academic papers, and tax forms for electronic filing

How to use PDF Merger (Combine PDFs)

01

Select PDF Files

Drop all the PDF files you wish to merge into the tool.

02

Arrange Document Order

Drag and drop the file cards to place them in your desired order.

03

Merge & Download

Click 'Merge PDFs' to assemble and download your unified document.

04

Compile & Save Document

Click the action button to let pdf-lib compile your new PDF in local memory, then download the finished document immediately.

Frequently Asked Questions

There is no software limit. You can combine dozens of files in a single pass depending on your device's memory.

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