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▤ DOCUMENT · PDF-MERGER

PDF Merger

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

local processing no upload archive ready
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▤ WORKSPACE
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▤ NOTES & SPECIFICATION

What is PDF Merging?

Merging PDFs is the process of combining two or more PDF files into a single document. This is one of the most common PDF tasks — useful when you have multiple scanned pages, separate invoices, or chapter exports that need to live together as one file.

How to Use This Tool

  1. Click the upload area or drag and drop your PDF files into the tool.
  2. Drag files in the list to set the merging order.
  3. Click "Merge PDFs" to combine them.
  4. Download the merged PDF with one click.

Everything runs locally in your browser using the pdf-lib JavaScript library. Your files are never uploaded to any server.

Why Merge PDFs in the Browser?

Most online PDF mergers upload your files to a remote server, which raises privacy concerns — especially for contracts, tax returns, medical records, and confidential business documents. Our browser-based approach keeps every byte of your file on your own device.

Common Use Cases

  • Combining scanned pages of a contract into one PDF before sending.
  • Merging monthly bank statements into a yearly archive.
  • Assembling chapters of a report exported separately from Word.
  • Compiling receipts and invoices for expense reporting.

Tips for Best Results

  • Rename your files in alphabetical or numerical order before uploading — the tool preserves the upload order.
  • Very large PDFs (hundreds of MB) may take a few seconds to process due to browser memory limits.
  • If a PDF is password-protected, unlock it first before merging.
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▤ QUESTIONS
01 Will the page order match my upload order? +

Yes. Pages are merged in the exact order you upload them. You can also drag items in the list to reorder before merging.

02 Are my PDF files uploaded to a server? +

No. All merging happens in your browser using the pdf-lib library. Files never leave your device.

03 Is there a limit on the number of PDFs I can merge? +

There is no hard limit imposed by this tool. Practical limits depend on your device memory — most users can comfortably merge dozens of files totaling a few hundred MB.

04 Does merging affect the quality of the PDFs? +

No. The original pages are copied byte-for-byte into the merged document. There is no re-compression or quality loss.