Protect PDF
Add a password and encrypt your PDF file.
How to Use Protect PDF
- Upload your file: Drag and drop your file into the active processing area above, or click the box to browse your device files.
- Configure settings: Select your preferred options (such as target file size in KB, compression level, page order, or output format).
- Process locally: Click the primary action button. Your file is rendered and encoded in seconds directly inside your browser memory.
- Download output: Click Download to save the modified document back to your device. No watermarks are added.
Zero-Cloud Privacy Guarantee
Unlike legacy web utilities that upload your sensitive documents to remote servers, PDFtiny executes 100% of processing inside your local browser using WebAssembly. Your files never leave your computer, ensuring complete privacy, enterprise compliance, and offline availability.
Technical Specifications
| Parameter | Specification |
|---|---|
| Processing Engine | Client-Side WebAssembly (WASM) & HTML5 File API |
| Server Transmission | 0 Bytes Uploaded (100% Local Browser Memory) |
| Device Compatibility | Chrome, Safari, Firefox, Edge, Android, iOS, Windows, Mac, Linux |
| Compliance | ISO 32000-2:2020, GDPR Article 25 (Privacy by Design) |
Frequently Asked Questions
What encryption standard does PDFtiny use to protect PDFs?
PDFtiny uses AES-256-bit encryption — the same standard used by banks and government agencies worldwide. You can also choose AES-128 for compatibility with older PDF viewers.
Can I restrict printing or copying even without a password?
Yes. Use the
Is my password ever sent to PDFtiny servers?
Never. The entire encryption process runs in your browser using the Web Crypto API. Your password and document are processed entirely locally and are never transmitted anywhere.
Will my password-protected PDF open on Android, iPhone, and desktop?
Yes. AES-256 password protection is part of the PDF 1.7 and PDF 2.0 standards. All major PDF viewers including Adobe Acrobat, Chrome, iOS Files, and Android apps correctly prompt for and accept the password.