Are my files uploaded to a server?

No. All document processing runs locally in your web browser via client-side Web Workers and WebAssembly. Your files never leave your device.

What file size limits apply?

You can combine up to 20 files at once with individual files up to 50MB each. Processing speed depends strictly on your device's local memory and CPU.

Can I rearrange the PDF files?

Yes. Simply grab the drag handle icon on any document card and move it up or down to set your preferred merge order.

Can I merge password-protected files?

Protected files must be unlocked before merging. We recommend removing restrictions prior to uploading for processing.

Free PDF Tool

Merge PDF Files Online

Combine multiple PDF files into a single document — fast, secure, and entirely in your browser.

100% PrivateNo uploads

Works OfflineIn your browser

SecureYour files stay on you device

PDF

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PDF

Multiple files → One document

Drag & drop PDF files here

Multiple files · Max 50MB each · PDF only

How It Works

Merge your PDF files in just a few simple steps.

Select PDF Files

Upload or drag and drop your PDF files. You can add multiple files at once.

Arrange & Merge

Reorder the files if needed, then click the merge button to combine them.

Download Result

Your merged PDF will be generated instantly. Download and use it right away.

Frequently Asked Questions

View all FAQs

Everything you need to know about our PDF merger.

Yes, it is 100% free with no hidden subscriptions, trial limits, watermarks, or account registration required.