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Encryption & Decryption Tool – AES, RSA & More

Encrypt and decrypt data with AES-256, RSA, and other algorithms—all offline with secure key management and multiple cipher modes.

🟢 Runs locally · no uploads

Encryption Tool

Encrypt and decrypt data with AES algorithms

edit_note Data & Key
Encryption Key:
Sensitive data to encrypt
lock_open Result
lock
Encrypted/decrypted output will appear here
Keyboard Shortcuts: Ctrl+V to paste • Ctrl+Enter to process

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› About this tool · FAQ

Stop exposing sensitive data! Encrypt and decrypt text instantly using industry-standard AES algorithms. Generate secure keys, protect sensitive data, and learn about cryptography. Supports AES-GCM, AES-CBC, and educational ciphers. Free, works offline, never stored.

How do I encrypt text online?

Paste your text, select encryption algorithm (AES-GCM recommended), choose key size (256-bit for best security), and click Encrypt. The tool generates a secure encryption key and encrypts data instantly in your browser.

Is this encryption tool free?

Yes, completely free with unlimited encryption and decryption. No signup required, no watermarks. All encryption happens in your browser for complete privacy of data and keys.

Are encrypted texts uploaded to servers?

No, all encryption and decryption happens locally in your browser using Web Crypto API. Your data, keys, and encrypted content never leave your computer for maximum security.

What encryption algorithms are supported?

The tool supports AES (Advanced Encryption Standard) in GCM, CBC, and CTR modes, plus educational ciphers like Simple XOR and Caesar cipher. AES is industry-standard and recommended for real security needs.

How secure is the encryption?

AES encryption is military-grade and used worldwide for sensitive data. However, this tool is for educational purposes - for production use, implement proper key management and use dedicated cryptographic libraries.

Can I use my own encryption key?

Yes! You can provide your own key or let the tool generate a cryptographically secure random key. Generated keys are displayed for your use but not stored anywhere.

What happens to my data and keys?

All encryption and decryption happens locally in your browser. No data, keys, or encrypted content is sent to any server or stored anywhere.

Why might decryption fail?

Common causes include wrong decryption key, mismatched algorithm, corrupted encrypted data, or incorrect output format. Ensure all parameters match those used for encryption.