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PDF加密

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最大文件大小：100MB

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    PDF Encrypt Tool

    PDF Encrypt Tool is a professional online PDF password protection editor that uses advanced AES encryption technology for browser-based processing, enabling you to add password protection to PDF files without uploading. Features dual password protection and precise permission control, perfectly solving document security and privacy protection needs.

    Core Features

    Advanced Encryption Protection System

    • AES-256 Encryption: Employs bank-level encryption standards to ensure absolute document security
    • Dual Password System: User password controls document opening, owner password manages permission modifications
    • Granular Permission Control: Supports 8 permission settings including printing, copying, modifying, annotations, and form filling
    • Local Processing Technology: WebAssembly technology enables browser-based encryption, files never uploaded to servers

    Professional Permission Management Features

    Multi-layer Permission Control: Allow or restrict printing, content modification, text copying, and page extraction Batch Processing Support: Simultaneously add same encryption settings to multiple PDF files Compatibility Assurance: Encrypted PDFs work normally in all mainstream PDF readers Format Integrity Preservation: 100% preserves original PDF format, fonts, images, and interactive functions

    Security Privacy Protection Technology

    Zero-Upload Architecture: All encryption operations completed locally in browser, protecting confidential document security Offline Working Mode: Works without internet after page load, suitable for processing sensitive business files Fast Response Processing: WebAssembly native performance, completes large document encryption within 3 seconds

    How to Use

    Operation Steps

    1. Upload PDF File: Drag or click to select PDF documents needing encryption (supports files within 100MB)
    2. Set Security Password: Enter user password (for opening/viewing) and owner password (for permission management), at least one required
    3. Configure Access Permissions: Select allowed operation permissions including printing, editing, copying, and other function controls
    4. Download Encrypted File: Click "Encrypt PDF" to complete processing, download PDF document with complete security settings

    Application Scenarios

    Business Commerce: Protect contracts, financial reports, business proposals, and other important documents Legal Compliance: Encrypt court documents, client files, regulatory documents, and other legally sensitive materials Medical Healthcare: Protect patient records, diagnostic reports, insurance claims, and other medical privacy information

    Technical Advantages

    Encryption Standards

    • Multi-level Encryption Algorithms: Supports AES-128 and AES-256 encryption, meeting different security level requirements
    • Cross-platform Compatibility: Full support for Chrome 88+, Firefox 85+, Safari 14+, Edge 88+ comprehensive compatibility
    • Processing Performance Optimization: Average encryption time 1-3 seconds, processing speed 20-100MB/second

    Security Assurance

    Enterprise-grade Security: Complies with ISO 32000 and GDPR standards, suitable for processing confidential business documents Zero-knowledge Processing: Does not collect file content, does not record user behavior, does not store temporary files Complete Anonymous Use: No account registration required, no data storage or tracking, data completely disappears when page is closed

    Frequently Asked Questions

    Q: Is PDF file encryption secure? A: Absolutely secure, employs AES-256 encryption standards used by banks and government institutions, all processing completed locally in browser.
    Q: Is the tool free to use? A: Completely free with no hidden costs, watermarks, or usage limitations, supports unlimited PDF encryption processing.
    Q: What's the difference between user password and owner password? A: User password is for opening PDF documents, owner password is for modifying document permission settings, different passwords can be set.
    Q: What permission controls are supported? A: Supports 8 permission settings: printing, modifying content, copying text, adding annotations, filling forms, extracting content, assembling documents, and high-quality printing.
    Q: Does encryption affect PDF compatibility? A: No impact, encrypted PDFs are fully compatible with all mainstream PDF readers, maintaining original document functionality.