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🔐 Encrypt Files & Text

AES-256 (GCM) with PBKDF2-SHA-256. Everything runs locally — nothing uploads.

In-browser · Password-based · Private

📦 Files

Drag & drop files here

Any file type. Encrypted output ends with .thenc.

    📝 Text

    Format & Safety
    • Container: THENC1 magic + JSON header + AES-GCM ciphertext.
    • Header stores: algorithm, IV, salt, PBKDF2 iterations, and original filename/mime/size.
    • Forgotten password cannot be recovered.
    Help & FAQ — Encrypt Text & Files

    How to use

    1. Choose whether you are encrypting text or a file.
    2. Enter or paste the content and set a strong password.
    3. Encrypt to generate ciphertext or decrypt by supplying the same password.

    Use cases

    • Encrypt notes before sending to a colleague.
    • Protect short text snippets offline.

    Tips & FAQs

    What algorithm is used?
    AES-GCM via the Web Crypto API with PBKDF2-derived keys.
    Is my password stored?
    No—keys are generated in-memory and cleared when you leave the page.

    Formats & limits

    • Best for text and files under ~50 MB due to browser memory limits
    • Losing the password means the data cannot be recovered
    • Relies on modern browsers with Web Crypto support

    Privacy

    Encryption happens entirely client-side; nothing is transmitted.

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    Updated

    15 October 2025