Merge PDF

Combine multiple PDF files into one document. Drag to reorder before merging, everything happens in your browser.

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Drop PDFs here to merge

Select 2 or more PDF files, order is preserved (drag to reorder)

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How PDF Merging Works

This tool uses pdf-lib, an open-source PDF manipulation library, running entirely in your browser. Each PDF you upload is parsed locally, its pages are copied in order into a single new document, and the result is assembled and downloaded, all without any file ever being sent to a server. This makes it safe for confidential documents, contracts, and personal files.

Common Uses

  • Combining scanned documents: merge individually scanned pages into one complete file for submission.
  • Assembling reports: combine a cover page, main report, and appendices from separate files into one polished document.
  • Invoice batches: merge multiple monthly invoices into a single file for accounting records.
  • Academic submissions: combine a thesis, references, and appendices that were exported separately.

Order Matters

The final merged PDF follows the order shown in the file list, top to bottom. Drag any file up or down before merging to control exactly how pages are sequenced in the output, the first file in the list becomes the first pages of your merged document.

Limitations

Password-protected PDFs cannot be merged directly, remove the password using a PDF editor first. Extremely large files (100MB+) may be slow to process since everything runs on your device's CPU rather than a server, but processing time scales with your own hardware rather than server queue congestion.