Encrypt & Decrypt Online — AES, RSA, ChaCha20
Secure your sensitive info with military-grade encryption. Our free online tool lets you encrypt or decrypt text using AES, RSA, and ChaCha20 algorithms — entirely in your browser for complete privacy, speed, and security.
Encryption & Decryption
Secure your sensitive info with military-grade AES, RSA, and ChaCha20 encryption. Encrypt or decrypt text entirely in your browser — fast, private, and free.
Choose Encryption Algorithm
AES-GCM is a symmetric encryption algorithm ideal for encrypting large data with a password.
Select Mode
Password
Use a strong, unique password that contains uppercase letters, lowercase letters, numbers, and special characters.
Plain Text
Key Features
Professional-grade tool designed for speed, security, and simplicity
AES & RSA Support
Encrypt or decrypt using popular secure algorithms.
Local-only
All operations happen in your browser for privacy.
Multiple Formats
Support for base64, hex, and raw text payloads.
How it works
Choose algorithm, provide key/iv and encrypt or decrypt locally.
Select
Pick algorithm and mode.
Provide
Provide key material or passphrase.
Execute
Run encryption/decryption in your browser.
Use cases
Secure notes
Encrypt sensitive snippets before sharing.
Testing
Generate test vectors for cryptographic debugging.
Learning
Experiment with algorithms without installing software.
Encryption & Decryption Best Practices
Tips on choosing algorithms, safely handling keys, and avoiding common pitfalls.
Use Strong Keys
Prefer high-entropy keys and avoid short passphrases for symmetric encryption.
Don't Reuse IVs
Initialization vectors must be unique per encryption to prevent pattern leaks.
Keep Keys Local
Never paste production keys into untrusted pages; this tool runs locally for safety.
Prefer Authenticated Modes
Use AEAD modes (like GCM) to avoid forgery and tampering attacks.
Use Standard Libraries
For production, use vetted crypto libraries and avoid rolling your own primitives.
Key Management
Store keys securely and rotate them periodically; treat keys as first-class secrets.
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