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Encryption Key Generator

Generate a cryptographically secure random AES key for symmetric encryption using the Web Crypto API CSPRNG.

ⓘ Use this as a raw AES-GCM key. For a passphrase-based encryption flow, try the Symmetric Encryption tool.

Base64 Encoding
Hex Encoding

AES Encryption Key Generator Online

Setting up a new database encryption column or configuring environment secrets? Our free online Symmetric Encryption Key Generator instantly generates cryptographically secure random bytes suitable for AES (Advanced Encryption Standard) operations. Available in 128-bit, 192-bit, and 256-bit lengths.

Cryptographically Secure: We do not rely on standard math random functions. This tool leverages the crypto.getRandomValues() API to generate true cryptographic randomness directly on your local device.

Core Features

  • Standard AES LengthsChoose between 128-bit (16 bytes), 192-bit (24 bytes), or maximum security 256-bit (32 bytes) keys to match your specific encryption algorithm requirements (e.g., AES-256-GCM).
  • Multiple Output FormatsEasily copy your generated secret key in Hexadecimal format, Base64 encoding, or raw ASCII string format depending on what your framework expects in its .env file.
  • No Server TransmissionGenerating secrets online can be risky. That's why our tool runs 100% locally in your browser. Your generated AES keys are never logged or sent to any backend server.

Example: 256-bit Key Formats

Hexadecimal
8f2b3e4... (64 chars total)
Base64
jy+L5A... (44 chars total)
ASCII
<Raw bytes mapped to ASCII...>

Related Tools

RSA/EC Key GeneratorGenerate asymmetric public/private key pairs.Symmetric EncryptionTest encrypting data with your newly generated AES key.API Key GeneratorGenerate secure, prefixable random API keys for your services.Hash GeneratorGenerate SHA-256 or SHA-512 hashes.

Categories

CryptographySecurity

Frequently Asked Questions

Is this just a random string generator?
No. A standard random string generator (like Math.random()) is mathematically predictable and insecure. This tool uses a Cryptographically Secure Pseudorandom Number Generator (CSPRNG) provided by your OS, ensuring the entropy of your keys cannot be guessed.
Which key size should I choose?
If your system supports it, always opt for 256-bit keys. While 128-bit is still considered secure against classical computers, 256-bit provides "quantum-resistant" security for symmetric algorithms like AES, making it the modern standard for top-secret data.