AES Encrypt / Decrypt
Encrypt and decrypt text with AES.
AES symmetric encryption protects sensitive text with a shared passphrase - useful for sharing secrets through insecure channels, learning cryptography, and testing encryption workflows. Utilitoo's AES Encrypt/Decrypt tool uses AES-256-GCM with PBKDF2 key derivation and a random salt and IV for each encryption.
Developers prototyping encrypted storage, security students learning symmetric encryption, and teams sharing credentials through chat all need a quick AES tool without installing OpenSSL. Encrypt with a strong passphrase and share both the ciphertext and passphrase through separate channels.
Enter text and a passphrase, then click Encrypt to get base64-encoded output. Switch to decrypt mode, paste the ciphertext and passphrase, and recover the original text. Pair with RSA Encrypt/Decrypt for asymmetric workflows or Hash Checker for integrity verification.
All encryption runs locally in your browser on Utilitoo using the Web Crypto API. Your plaintext, passphrases, and ciphertext are never uploaded. Free for learning and testing - use strong passphrases and audit for production use.
AES Encrypt / Decrypt supports learning and development workflows where you need a quick cryptographic operation without opening a terminal. It is not a substitute for production key management, HSMs, or audited security infrastructure. Review Utilitoo's Privacy Policy if your organization restricts browser-based crypto tools.
Common use cases
- Encrypt and decrypt text with AES - a common daily workflow on Utilitoo.
- Auditing secrets and credentials before committing code or sharing configs.
- Demonstrating aes encrypt decrypt concepts in security training without exposing production keys.
- Quick checks on aes encrypt decrypt output when you cannot use a local CLI tool.
- Cross-checking AES Encrypt / Decrypt output against a colleague's result during pair debugging or code review.
Tips & common mistakes
AES Encrypt / Decrypt is designed for development and education - never paste production secrets into any online tool unless you trust the privacy model. On Utilitoo, cryptographic operations run client-side, but you should still rotate credentials if they may have been exposed. Use generated passwords and tokens immediately and store them in a password manager rather than leaving them in browser history. AES Encrypt / Decrypt on Utilitoo runs client-side, so keys and plaintext you enter are not uploaded for processing. Still follow your organization's policy on secrets in browser tools, rotate any credential that may have been exposed, and prefer test keys when experimenting.
Common errors
- Wrong key length or encoding - AES keys must match the selected bit size; hex and UTF-8 keys are not interchangeable without conversion.
- Algorithm mismatch - decryption fails if the mode, IV, or salt differs from what was used during encryption.
How to use
- Enter text and passphrase.
- Encrypt or decrypt.
Frequently Asked Questions
Which AES mode does Utilitoo use?▼
AES-256-GCM with a random 12-byte IV and PBKDF2 key derivation from your passphrase.
Is my passphrase stored?▼
No. Passphrases exist only in your browser session and are never sent to any server.
Can I decrypt on a different device?▼
Yes. Use the same passphrase and ciphertext. The salt and IV are embedded in the output.
Is this safe for production secrets?▼
It uses standard Web Crypto APIs. For production, audit your workflow and use strong passphrases.
Is my data uploaded during encryption?▼
No. All operations run locally in your browser on Utilitoo.
Related Tools
RSA Encrypt / Decrypt
RSA public/private key encryption.
SHA256 Generator
Generate SHA-256 hashes from text.
Hash Checker
Verify text against a known hash.
Password Generator
Generate strong random passwords.
Token Generator
Generate secure API tokens and secrets.
Secure Random Generator
Generate cryptographically secure random values.