Is this encryption tool secure?

All encryption and decryption happens client-side in your browser using the Web Crypto API. Your text and key never leave your device — they are not sent to any server. That said, AES with a weak password is only as secure as the password.

AES-256 vs AES-128 — which should I use?

AES-256 has a larger key space and is the default for most security-sensitive applications. AES-128 is still considered secure against all known attacks and is faster. For most use cases either is fine; AES-256 is preferred if regulatory compliance (FIPS, NIST) requires it.

Encryption Tool — Free AES, DES & TripleDES Encrypt/Decrypt

GenTools/Encryption Tool

Country Tools:

Text Encryption

Developer

Encrypt and decrypt text using AES, DES, and TripleDES algorithms. Secure client-side encryption tool.

Algorithm

Secret Passphrase

Input Text

Output Result

What is This Tool?

A text encryption tool encrypts and decrypts text using standard algorithms like AES-256-GCM and AES-256-CBC. Enter plaintext and a password to produce ciphertext that can only be decrypted with the same password — useful for protecting sensitive data in transit or storage.

AES (Advanced Encryption Standard) is the gold standard for symmetric encryption, approved by NIST and used worldwide. AES-256-GCM provides both confidentiality and authenticity (authenticated encryption), while AES-256-CBC provides confidentiality only and requires a separate MAC for integrity.

All encryption happens client-side in your browser via the Web Crypto API — your text and password never leave your device, and nothing is sent to a server.

AES Encryption Algorithms Compared

Algorithm	Key Size	Authenticated?	When to use
AES-256-GCM	256-bit	Yes (built-in)	Default for new applications. Detects tampering, no separate MAC needed.
AES-256-CBC	256-bit	No (needs HMAC)	Legacy compatibility. Pair with HMAC-SHA256 for "encrypt-then-MAC".
AES-128-GCM	128-bit	Yes	Faster on low-power hardware. Still secure against all known attacks.
3DES (TripleDES)	168-bit	No	Deprecated by NIST in 2023. Only for legacy decryption — never new code.

If you can choose freely, use AES-256-GCM. The password is fed through PBKDF2 (or Argon2 in stronger setups) to derive an actual cryptographic key — which is why a long, high-entropy password matters more than picking 256 bits over 128.

Common Use Cases

Sensitive Data Protection

Encrypt API keys, credentials, and sensitive messages before sharing through insecure channels like email or chat.

Configuration Encryption

Encrypt sensitive config values (database passwords, API secrets) before committing to version control.

Learning Cryptography

Experiment with encryption parameters (algorithms, modes, key derivation) to understand symmetric cryptography concepts.

Data at Rest Protection

Encrypt files and text before storing in databases or cloud storage that may not provide built-in encryption.

Frequently Asked Questions

Is this encryption secure?

Yes. AES-256 is the same standard used by governments and financial institutions. Security depends on password strength — use a long, random password.

What is the difference between GCM and CBC?

GCM (Galois/Counter Mode) provides authenticated encryption — it detects tampering. CBC (Cipher Block Chaining) encrypts but does not detect modifications without an additional MAC.

Can I decrypt without the password?

No. AES encryption with a strong password is computationally infeasible to break. If you lose the password, the data is unrecoverable.