Frequently Asked Questions

It's simple! Just drag and drop your PDF files into the upload area, arrange them in your desired order by dragging, then click the 'Merge PDFs' button. Your merged document will be ready for download in seconds.

Yes, absolutely! All PDF processing happens directly in your browser using client-side JavaScript. Your files never leave your device and are not uploaded to our servers. This ensures complete privacy and security of your documents.

You can upload PDF files up to 100MB each. For larger files, we recommend compressing them first or splitting them into smaller parts before merging.

You can merge up to 50 PDF files in a single operation. This should be sufficient for most use cases, from combining a few documents to merging entire document collections.

Our PDF Ninja works in all modern browsers including Chrome, Firefox, Safari, Edge, and Opera. We recommend using the latest version of your browser for the best experience.

No registration required! You can use our PDF Ninja tool immediately without creating an account, providing personal information, or signing up for anything.

Yes, our PDF Ninja is completely free to use. There are no hidden fees, subscription requirements, or usage limits. You can merge as many PDFs as you need without any cost.

Currently, we support PDF files only. The merged output will also be in PDF format. We're working on adding support for other document formats in the future.