Merge PDF Files

Combine multiple PDF documents into a single organized file in seconds.

About this tool

Combine multiple PDF documents into a single cohesive file without installing software or waiting for server uploads.

How to use this tool

  1. Select or drag & drop the PDF files you want to merge.
  2. Rearrange the page cards in your preferred reading order.
  3. Click the Merge PDF button to compile your single combined document.
  4. Download your merged PDF file instantly.

How it works

Tool Fly processes your PDF files directly in your browser using pdf-lib. Your files are merged in memory and never leave your computer.

When to use this tool

  • Students combining assignment covers, report bodies, and appendices.
  • Professionals assembling contracts, invoices, and signed addenda.
  • Freelancers consolidating multiple project briefs into a single submission.

Frequently asked questions

Is there a limit on how many PDFs I can merge?

You can merge up to 200 PDF files at once with a cumulative batch limit of 100MB.

Are my private files uploaded to your servers?

No. The merger executes entirely inside your browser memory.

Limitations

Encrypted PDFs require unlocking before merging. Batch limit is 100MB.

Privacy

Zero file uploads. All processing occurs locally on your device.