🔐 Algorithms

AES (Advanced Encryption Standard) DES (Data Encryption Standard) Triple DES (3DES) Blowfish Twofish CAST-128 CAST-256 RC2 RC4 Serpent Rijndael-128 Rijndael-192 Rijndael-256

⚙️ Modes

CBC (Cipher Block Chaining) ECB (Electronic Codebook) CFB (Cipher Feedback) OFB (Output Feedback) CTR (Counter) GCM (Galois/Counter Mode)

🔑 Encryption Key

Multiple Algorithms

Support for AES, DES, Triple DES, Blowfish, Twofish, RC2, RC4, CAST, Serpent, and Rijndael algorithms. Choose from industry-standard encryption methods with different key sizes and block sizes to match your security requirements and performance needs.

Cipher Modes

Support for CBC, ECB, CFB, OFB, CTR, and GCM cipher modes. Each mode offers different security properties and use cases. CBC provides good security for most applications, while GCM offers authenticated encryption with additional data integrity.

Flexible Key Sizes

Support for 128-bit, 192-bit, and 256-bit keys depending on algorithm. Larger keys provide stronger security but may be slower. AES-256 is recommended for high-security applications, while AES-128 balances security and performance for most uses.

Output Formats

Choose hexadecimal, Base64, or UTF-8 output encoding. Hex is human-readable and URL-safe, Base64 is compact and widely supported for data transmission, UTF-8 maintains Unicode compatibility. Pick the format that best suits your application needs.

Key Generation

Generate cryptographically secure random keys with one click. Uses browser's crypto.getRandomValues() for strong randomness. Eliminates weak password selection risks. Generated keys meet length requirements automatically for selected algorithm and key size.

Client-Side Processing

All encryption and decryption happens in your browser—no data sent to servers. Your text, keys, and encrypted data remain completely private and secure. Works offline after page load. Perfect for handling sensitive information with zero trust architecture.

AES Encryption Formula (CBC Mode):

\(C_0 = IV\)
\(C_i = E_K(P_i \oplus C_{i-1})\)
where \(C\) = ciphertext, \(P\) = plaintext, \(K\) = key, \(E\) = encryption function

💬 Secure Messaging

Encrypt sensitive messages, passwords, or private information before sending via email or messaging apps. Protects confidential business communications, personal data, or credentials from unauthorized access during transmission across untrusted networks.

📄 File Protection

Encrypt text content before saving to cloud storage or local files. Protects documents, notes, configuration files, or source code from unauthorized access if storage is compromised. Essential for protecting sensitive data at rest on shared or unsecured systems.

🔑 Password Management

Encrypt and store passwords, API keys, or authentication tokens securely. Create encrypted backup copies of credential databases. Safely share passwords with team members by encrypting and transmitting the cipher text, then sharing the decryption key separately through a secure channel.

💻 Development & Testing

Test encryption implementations in applications, verify encryption/decryption logic, debug cryptographic issues, or understand how different algorithms and modes behave. Developers can compare algorithm outputs and validate encrypted data formats for compliance and interoperability.

📊 Data Privacy

Protect personally identifiable information (PII), financial data, or health records before storing in databases or transmitting to third parties. Ensures compliance with privacy regulations like GDPR, HIPAA, or PCI-DSS by encrypting sensitive data fields in applications.

🎓 Learning Cryptography

Understand how encryption algorithms work, compare different cipher modes, experiment with key sizes and output formats. Students and security professionals can learn cryptography concepts through hands-on practice with real encryption algorithms without writing code.

For most applications, AES (Advanced Encryption Standard) is the best choice. It's widely trusted, used by governments and enterprises worldwide, and offers excellent security with good performance. Use AES-256 for maximum security or AES-128 for a balance of security and speed. Avoid legacy algorithms like DES which are no longer considered secure. For specific requirements, Twofish or Serpent offer alternatives to AES with similar security levels.

CBC (Cipher Block Chaining) mode is more secure than ECB (Electronic Codebook). In ECB, each block is encrypted independently, so identical plaintext blocks produce identical ciphertext blocks, potentially revealing patterns. CBC chains blocks together using an initialization vector (IV), so each ciphertext block depends on all previous blocks. This means identical plaintext blocks produce different ciphertext, providing better security. Always prefer CBC or other advanced modes over ECB for sensitive data.

Use our Generate Key button to create a cryptographically secure random key. If creating manually, use a long random string with mixed characters (letters, numbers, symbols). Avoid dictionary words, names, or predictable patterns. Key length matters: longer keys are more secure. For AES-256, you need a 32-byte (256-bit) key. Never reuse keys across different data. Store keys separately from encrypted data, preferably in a secure key management system or password manager.

Yes, completely safe. All encryption and decryption happens entirely in your browser using JavaScript—no data is ever sent to our servers or stored anywhere. Your plaintext, keys, and encrypted data remain on your device. We have no access to your information. This client-side approach ensures maximum privacy and security. You can even use the tool offline after the page loads. However, remember that encryption security depends on keeping your keys secret.

If you lose your encryption key, your encrypted data is permanently unrecoverable. Strong encryption algorithms like AES-256 are designed to be mathematically impossible to break without the key, even with unlimited computing power. This is why encryption is effective—but it also means you must safeguard your keys. Always keep secure backups of important keys in password managers or secure storage. For critical data, consider key escrow or split-key arrangements with trusted parties.

No, properly encrypted text cannot be decoded without the correct key using modern algorithms like AES. Brute-force attacks (trying all possible keys) are theoretically possible but practically impossible—AES-256 would take billions of years to crack with current technology. However, weak passwords or poor key management can compromise security. Encryption is only as strong as the key and its protection. Side-channel attacks or implementation flaws are bigger risks than breaking the algorithm itself.