Local Encryption Tool

Encrypt and decrypt text or files directly in your browser. Fully offline, AES-GCM, no external servers.

Privacy First. This tool runs entirely in your browser. No data is sent to any server. A strict Content Security Policy prevents external connections.
Text Encryption
File Encryption
How It Works
Authenticated encryption with random salt and IV, PBKDF2-SHA-256 key derivation.
For decryption, use the same passphrase used for encryption.
Result
📁

Upload a File

Drag & drop a file here or click to browse

File Processing Complete

Your file has been processed. Click “Download Result” to save it.

About This Tool

This tool uses the browser’s Web Crypto API with AES-256-GCM and PBKDF2-SHA-256. Salts and IVs are generated with a cryptographically secure PRNG. All work happens locally.

Format

Outputs are JSON (“armored”) with fields: v version, a algorithm, i iterations, s base64 salt, iv base64 IV, ct base64 ciphertext. Files also include name and mime when encrypting.

Security Notes

  • Choose a strong, unique passphrase. Longer is better.
  • If decryption fails, it could be an incorrect passphrase or corrupted input.
  • Large files may use significant memory; this tool processes files in-memory.

CyberLife Coach provides educational tools and information to help users improve personal cybersecurity and privacy. Nothing here constitutes legal, financial, or professional advice. Always consult qualified counsel when needed.

Use these resources only for lawful purposes and only on systems or accounts you own or are explicitly authorized to assess. Do not use any content, code, or techniques to gain unauthorized access, monitor others without consent, damage systems or data, or violate terms of service.

Do not attempt to evade, hinder, or obstruct law enforcement. If contacted by or involved in a legal investigation, seek appropriate legal counsel before taking action. CyberLife Coach does not condone illegal activity or interference with investigations.

Security and privacy outcomes cannot be guaranteed. You are solely responsible for how you use these tools and for complying with applicable laws in your jurisdiction. Encryption and export-control rules vary by country—verify legality before use.

By using this site or any associated tools, you agree to act responsibly and within the bounds of the law.