ToolRun
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PDF Merge

Combine multiple PDF files into a single document. Drag to reorder pages before merging. All processing happens in your browser — files are never uploaded.

PDF Merge

Combine multiple PDF files into a single document. All processing happens in your browser.

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Drop PDF files here or click to select

Select multiple PDFs to merge them into one

How to Merge PDF Files

This tool lets you combine multiple PDF documents into a single file. Simply drop your PDF files, arrange them in the desired order using the up/down buttons, and click Merge. The combined PDF preserves all pages, bookmarks, and formatting from the original documents.

Common Use Cases

  • Combining reports: Merge monthly reports into a single annual document.
  • Assembling applications: Combine a cover letter, resume, and references into one PDF for job applications.
  • Organizing documents: Merge scanned pages that were saved as separate PDFs into a single file.
  • Creating portfolios: Combine multiple design files or certificates into one presentation-ready document.

How It Works

This tool uses the pdf-lib library to process PDFs entirely in your browser using JavaScript. When you merge files, it copies all pages from each source PDF into a new document while preserving the original page dimensions, content, and embedded fonts. No data is sent to any server.

Frequently Asked Questions

Is there a limit to how many PDFs I can merge?
There is no hard limit. However, merging many large PDFs (hundreds of megabytes total) may be slow or cause your browser to run out of memory. For best results, keep the total combined size under 100 MB.
Will merging PDFs reduce quality?
No. Merging copies the original page data without re-encoding or compressing it. The output quality is identical to the source files.
Can I merge password-protected PDFs?
This tool can merge PDFs that use an empty owner password (common for print-restricted PDFs). PDFs that require a password to open cannot be merged without first removing the encryption.
Are my files uploaded to a server?
No. All processing happens locally in your browser using JavaScript. Your files never leave your device.

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