About Encrypt/Decrypt

Use Encrypt/Decrypt to AES, TripleDES, RC4. The tool runs in your browser for fast results and keeps your data local.

How to Use

  1. 1. Add your input or data.
  2. 2. Adjust options if needed.
  3. 3. Review the result and copy it.

What is Text Encryption?

Text encryption is the process of converting readable plaintext into unreadable ciphertext using cryptographic algorithms and secret keys. Modern encryption uses symmetric algorithms like AES (Advanced Encryption Standard) where the same key encrypts and decrypts data, or asymmetric algorithms like RSA where a public key encrypts and a private key decrypts. Encryption protects sensitive information from unauthorized access during storage and transmission. Strong encryption algorithms are computationally infeasible to break without the correct key. Browser-based encryption tools process data locally without sending plaintext to servers, providing privacy and security. Common encryption modes include CBC (Cipher Block Chaining), GCM (Galois/Counter Mode), and ECB (Electronic Codebook), each with different security properties.

Common Use Cases

Text encryption is essential for protecting sensitive information across various scenarios. Developers encrypt API keys, database credentials, and configuration secrets before storing them in version control or environment files. Security teams encrypt sensitive customer data, personal information, and financial records to comply with regulations like GDPR and HIPAA. Communication platforms encrypt messages end-to-end to prevent interception. Password managers encrypt vault contents with master passwords. DevOps engineers encrypt deployment secrets and CI/CD pipeline credentials. Backup systems encrypt archived data to protect against unauthorized access. Developers encrypt tokens and session data in cookies and local storage.

  • Encrypting API keys and credentials in configuration files
  • Protecting sensitive customer data for GDPR compliance
  • End-to-end message encryption in chat applications
  • Password manager vault encryption
  • Encrypting deployment secrets in CI/CD pipelines
  • Backup and archive encryption for data protection
  • Encrypting tokens and session data in browsers
  • Securing database fields containing PII

Best Practices & Tips

Always use established encryption algorithms like AES-256 rather than creating custom encryption schemes. Use strong, randomly generated keys with sufficient length—at least 256 bits for AES. Never hardcode encryption keys in source code—use environment variables or key management systems. Use authenticated encryption modes like AES-GCM that provide both confidentiality and integrity. Store initialization vectors (IVs) alongside ciphertext but never reuse IVs with the same key. Implement proper key rotation policies to limit exposure if keys are compromised. Use HTTPS/TLS for transmitting encrypted data to prevent man-in-the-middle attacks. Regularly update encryption libraries to patch security vulnerabilities.

  • Use AES-256 or other established algorithms, not custom schemes
  • Generate strong random keys with at least 256 bits
  • Never hardcode keys in source code, use environment variables
  • Use authenticated encryption modes like AES-GCM
  • Store IVs with ciphertext but never reuse them
  • Implement key rotation policies for compromised keys
  • Use HTTPS/TLS when transmitting encrypted data
  • Update encryption libraries regularly for security patches

Troubleshooting Common Issues

If decryption fails with "bad decrypt" or "wrong final block length" errors, verify you are using the exact same key, algorithm, and mode that were used for encryption. Encoding issues can cause failures—ensure consistent encoding (UTF-8, Base64) for keys, IVs, and ciphertext. If encrypted data is corrupted or truncated, decryption will fail—verify data integrity during storage and transmission. Missing or incorrect initialization vectors (IVs) cause decryption failures—always store IVs with ciphertext. If you lose the encryption key, data cannot be recovered—implement secure key backup procedures. Performance issues with large data can be mitigated by encrypting in chunks or using streaming encryption.

  • Decryption failing due to wrong key, algorithm, or mode
  • Encoding mismatches between encryption and decryption
  • Corrupted or truncated ciphertext causing failures
  • Missing or incorrect initialization vectors (IVs)
  • Lost encryption keys making data unrecoverable
  • Performance issues when encrypting large amounts of data
  • Padding errors from incorrect block cipher modes

Frequently Asked Questions

Is Encrypt/Decrypt free to use?

Yes. Encrypt/Decrypt is free and works directly in your browser.

Does Encrypt/Decrypt upload my data?

No. Most processing happens locally. Any network requests are clearly indicated.

What formats does Encrypt/Decrypt support?

Encrypt/Decrypt supports the common formats described on the page. Convert uncommon formats before pasting.

How should I share results from Encrypt/Decrypt?

Copy the output and review any sensitive data before sharing or publishing.