Frequently Asked Questions
Everything you need to know about PDFNinja.
Is PDFNinja completely free?▼
Yes. All 27+ tools are 100% free to use with no hidden charges, no subscription fees, and no usage limits.
Do my files get uploaded to a server?▼
No. All processing happens entirely in your browser using WebAssembly technology. Your files never leave your device.
Do I need to create an account?▼
No account, email, or signup is required. Open any tool and start using it immediately.
What file size limit is there?▼
Most tools support files up to 100MB. Some tools like Image to PDF support up to 50MB per file with a maximum of 50 files at once.
Which browsers are supported?▼
PDFNinja works on all modern browsers — Chrome, Firefox, Safari, Edge. For best performance, use the latest version of Chrome or Edge.
Can I use PDFNinja offline?▼
Yes. PDFNinja is a Progressive Web App (PWA). Once installed, basic tools work completely offline without any internet connection.
How is PDFNinja different from other PDF tools?▼
Most PDF tools upload your files to their servers. PDFNinja is different — all processing is done directly in your browser, giving you complete privacy and security.
Is PDFNinja GDPR compliant?▼
Yes. Since no files are ever uploaded to our servers and we collect zero user data, PDFNinja is fully GDPR compliant by design.
What PDF operations are supported?▼
PDFNinja supports 27+ operations across 6 categories: Conversion, Organization, Optimization, Editing, Security, and Utilities. This includes merge, split, compress, convert, watermark, OCR, signature, and more.
How do I report a bug or request a feature?▼
Use the Feedback page or Contact page to reach our team. We review all feedback and prioritize based on user demand.