Free Online Text Encryption and Decryption Tool — instantly encrypt or decrypt any text or string with ease.
Simply enter your message, optionally provide a secret key, and get results in seconds.
Supports custom keys for added control and follows industry security standards recommended by
NIST
and best practices from
OWASP.
Encryption
is the process by which a readable message is converted to an unreadable form to prevent
unauthorized parties from reading it. The original message is called the
plaintext and the encrypted output is called the ciphertext.
This tool uses AES-256 — the same cipher used by banks, governments,
and security professionals worldwide.
Text Decryption
Decryption
is the process of transforming data that has been rendered unreadable through
encryption back to its unencrypted form. You need the same secret key that was
used during encryption to successfully decrypt the message.
Encrypted text often increases in size due to encoding and padding.
Before storing or transmitting encrypted data, you can calculate the
string size in bytes
to ensure it fits within database columns or API payload limits.
AES-256 Encryption Industry-standard symmetric cipher used worldwide
Custom or Auto Key Bring your own key or generate a strong one
No Sign-up Required Free to use, no account or login needed
Encryption Best Practices
Follow these guidelines to keep encrypted data truly secure:
Use Established Algorithms
Stick to AES-256 for symmetric and RSA/ECC for asymmetric encryption.
Avoid custom or proprietary ciphers.
Use Strong, Random Keys
Keys should be at least 256 bits and generated with a cryptographically
secure random number generator — never hand-typed phrases.
Hash Passwords, Don't Encrypt Them
Use bcrypt or
Argon2 for
passwords. Hashing is one-way; encryption requires you to store the key.
Manage Keys Securely
Never hardcode keys in source code or store them next to encrypted data.
Use a KMS or HSM in production environments.
Encrypt Data in Transit with TLS
Always use TLS when transmitting sensitive data over a network — encryption
at rest alone is not sufficient.
Keep Libraries Updated
Regularly update encryption libraries and audit your implementation.
New vulnerabilities are discovered frequently.
Frequently Asked Questions
This tool uses AES-256 (Advanced Encryption Standard with a 256-bit key) —
the same cipher used by governments, banks, and security professionals globally.
No. All encryption and decryption runs entirely in your browser.
Your text, secret key, and results are never transmitted or stored anywhere.
The encrypted text cannot be decrypted without the original secret key.
There is no recovery option — store your key safely using our
Secure Password Vault.
This tool is designed for personal, educational, and light professional use.
For production secrets, use a dedicated secrets manager (AWS Secrets Manager,
HashiCorp Vault, etc.) with proper key rotation and access controls.
Encryption is reversible — with the correct key you can recover the original text.
Hashing is one-way — it produces a fixed-length fingerprint that cannot be reversed.
Use encryption for data you need to retrieve; use hashing for passwords.
Support This Free Tool!
Buying me a coffee helps keep the project running and supports
new features.
