🔒PDF Security

Protect PDF with Password Free
100% Private, In-Browser

Bank-grade 256-bit AES encryption. Processed locally on your machine. Passwords and files never touch a server.

Choose a PDF file to encrypt

or drag and drop your document here

Select PDF File
🔒Zero-Knowledge Encryption⚡Instant AES-256♾️Unlimited Files

Why Encrypt PDF Files Locally in Your Web Browser?

Whether you are transmitting confidential payroll summaries, personal medical records, or sensitive contracts, protecting your documents with strong encryption ensures that only authorized recipients possessing the password can open the file.

Sending private documents and plaintext passwords to cloud-based PDF conversion portals creates catastrophic security vulnerabilities. FileConvert performs military-grade 256-bit AES encryption directly inside your client browser sandbox using modern WebCrypto APIs. The cryptographic hash calculation and file encryption happen on your device's processor—meaning your password and documents never travel across the internet.

Universal Reader Compatibility & Standard Security

Files encrypted with our tool adhere strictly to the Adobe PDF specification (ISO 32000-1). When opened in Adobe Acrobat, Apple Preview, Google Chrome, Microsoft Edge, or mobile PDF viewers, users will be prompted for the exact password you configured.

How It Works (Step-by-Step Guide)

1

Upload Document

Drag and drop your PDF into the upload zone to load your document.

2

Set Password

Enter and confirm your chosen password, and choose printing and copying permissions.

3

Encrypt & Download

Click Encrypt & Protect to generate your password-locked PDF and download immediately.

Why Client-Side Matters

Experience modern client-side document processing with zero compromises.

⚡

Instant Processing

No network upload queues or waiting for server workers. Conversions begin immediately upon file selection.

🛡️

Bank-Grade Privacy

Your documents stay in your browser's sandboxed memory. No logs, no analytics on contents, zero server uploads.

♾️

Zero File Size Limits

Encrypt massive multi-gigabyte or hundreds of pages without encountering arbitrary paywall caps.

📶

Full Offline Capability

Powered by Service Workers, this tool functions seamlessly even on airplanes or in secure offline air-gapped environments.

Frequently Asked Questions

Does anyone see or store the password I choose?

No. The password and document encryption are processed strictly within your local browser memory using the native Web Crypto API. Neither your file nor your password is ever sent to a server.

What encryption standard is used to lock the PDF?

We utilize industry-standard 256-bit AES (Advanced Encryption Standard) encryption, compliant with ISO 32000-1 specifications. It is fully compatible with Adobe Acrobat, Apple Preview, and mobile PDF readers.

Can I recover my PDF if I forget the password?

No. Because our zero-knowledge client architecture never stores your password or files on our servers, there is no backdoor or recovery mechanism. Please keep your password safe.

Can I set printing and copy permissions?

Yes. You can allow or disallow printing and text/graphics copying while encrypting your document.

Related PDF & Document Tools

Watermark PDFMerge PDFSplit PDFPDF to WordPage Numbers PDF

Skip the search next time.

This is free, no catch, no signup. Pin us so it's here when you need it.