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Text Encrypt Decrypt Tool

Encrypt and decrypt text using AES, RSA, and other secure algorithms

Encrypt Text

Characters: 0 | Bytes: 0
Very Strong: Advanced Encryption Standard - Industry standard

Encrypted Output

Enter text and secret key to see results in real-time

Encryption Algorithms

AES:Most Secure (Recommended)
TripleDES:Good Security (Legacy)
Rabbit:Fast Stream Cipher
RC4:Fast but Deprecated

Security Tips

• Use strong, unique secret keys (32+ characters)
• AES is the gold standard for encryption
• Never share your secret keys publicly
• Test decryption before relying on encryption
• Consider using key derivation for passwords

Encryption Security Best Practices

  • • Strong Keys: Use long, random secret keys with mixed characters
  • • Key Management: Store keys securely and separately from encrypted data
  • • Algorithm Choice: AES is recommended for maximum security
  • • Test Thoroughly: Always verify decryption works before trusting encryption
  • • Backup Keys: Losing your key means losing your data permanently

About Text Encryption & Decryption

Text encryption converts readable text into unreadable ciphertext using cryptographic algorithms, ensuring data confidentiality and security. Our tool supports multiple encryption methods including AES-256, RSA, and symmetric/asymmetric encryption schemes.

  • AES-256 symmetric encryption for fast, secure data protection
  • RSA asymmetric encryption for key exchange and digital signatures
  • Multiple cipher modes: CBC, GCM, ECB for different security needs
  • Secure key generation and management
  • Base64 encoding for safe text transmission

Encryption Algorithms

Symmetric Encryption

  • AES-256: Advanced Encryption Standard (industry standard)
  • AES-192: Medium security with good performance
  • AES-128: Fast encryption for less sensitive data
  • ChaCha20: Modern stream cipher alternative
  • 3DES: Legacy triple DES encryption

Asymmetric Encryption

  • RSA: Rivest-Shamir-Adleman (1024-4096 bit keys)
  • ECC: Elliptic Curve Cryptography (smaller keys)
  • DSA: Digital Signature Algorithm
  • EdDSA: Edwards-curve signatures
  • Diffie-Hellman: Key exchange protocol

Frequently Asked Questions

How to encrypt text online?

Paste your plaintext into the utilAZ encrypt tool, enter a password, select AES-256-GCM mode, and click Encrypt. The tool derives a key via PBKDF2, generates a random IV, encrypts client-side in the browser, and outputs a Base64 ciphertext string you can safely share or store.

What is the best text encryption tool?

The best tool uses AES-256-GCM with authenticated encryption, runs entirely client-side so data never leaves your browser, derives keys with PBKDF2 or Argon2, and supports multiple output formats. utilAZ meets all these criteria and is free with no signup required.

How to decrypt encrypted text?

Paste the Base64 ciphertext into the Decrypt tab, enter the same password used during encryption, select the matching algorithm (e.g. AES-256-GCM), and click Decrypt. The tool re-derives the key, extracts the IV from the ciphertext header, and returns the original plaintext.

Is online text encryption safe?

Yes, if the tool performs all cryptography client-side using the Web Crypto API. utilAZ never transmits your plaintext or password to any server. Verify by checking your browser network tab during encryption. No outbound requests are made with your data.

Difference between encryption and encoding?

Encryption transforms data using a secret key so only authorized parties can read it (AES, RSA). Encoding converts data to another format for compatibility (Base64, URL-encoding) with no secret and anyone can decode it. Encoding is not security; encryption is.

Encryption Examples

AES-256 Encryption:

Plaintext:
Hello World! This is my secret message.
Key (32 bytes):
mySecretKey12345678901234567890
Encrypted (Base64):
U2FsdGVkX1+vupppZksvRf5pq5g5XjFRIipRkwB0K4FeUaRw...

RSA Encryption Process:

1. Key Generation
Size: 2048-bit RSA keypair
Public: For encryption
Private: For decryption
2. Encryption
Input: Plaintext + Public Key
Output: Encrypted ciphertext
Padding: OAEP recommended
3. Decryption
Input: Ciphertext + Private Key
Output: Original plaintext
Verification: Integrity check

Encryption Implementation

Practical encrypt/decrypt examples using Web Crypto API and popular libraries:

JavaScript - AES-256-GCM (Web Crypto API):

// Encrypt const key = await crypto.subtle.generateKey( { name: 'AES-GCM', length: 256 }, true, ['encrypt', 'decrypt'] ); const iv = crypto.getRandomValues(new Uint8Array(12)); const encrypted = await crypto.subtle.encrypt( { name: 'AES-GCM', iv }, key, new TextEncoder().encode('Secret message') ); // Decrypt const decrypted = await crypto.subtle.decrypt( { name: 'AES-GCM', iv }, key, encrypted ); const plaintext = new TextDecoder().decode(decrypted);

Python - AES with Fernet:

from cryptography.fernet import Fernet # Generate key key = Fernet.generate_key() cipher = Fernet(key) # Encrypt encrypted = cipher.encrypt(b'Secret message') # Decrypt plaintext = cipher.decrypt(encrypted) # b'Secret message'

Node.js - crypto module:

const crypto = require('crypto'); const key = crypto.randomBytes(32); const iv = crypto.randomBytes(16); // Encrypt const cipher = crypto.createCipheriv('aes-256-cbc', key, iv); let encrypted = cipher.update('Secret', 'utf8', 'hex') + cipher.final('hex'); // Decrypt const decipher = crypto.createDecipheriv('aes-256-cbc', key, iv); let decrypted = decipher.update(encrypted, 'hex', 'utf8') + decipher.final('utf8');

Encryption Algorithm Comparison

Symmetric (AES):

✓ Very fast encryption/decryption
✓ Excellent for large data
✓ Battle-tested security
✗ Key distribution challenge
✗ Same key for encrypt/decrypt

Asymmetric (RSA):

✓ Secure key exchange
✓ Digital signatures
✓ No shared secret needed
✗ Much slower than AES
✗ Limited message size

Hybrid Approach:

✓ RSA for key exchange
✓ AES for data encryption
✓ Best of both worlds
✓ Used in TLS/SSL
~ More complex implementation

Encryption Security Best Practices

  • Use Strong Passwords: Long, complex passwords with mixed characters
  • Secure Key Storage: Never hardcode keys, use secure key management
  • Choose Right Algorithm: AES-256 for data, RSA-2048+ for keys
  • Use Random IVs: Always generate fresh initialization vectors
  • Implement Properly: Use established libraries, avoid custom crypto
  • Regular Key Rotation: Change encryption keys periodically
  • Test Decryption: Always verify you can decrypt before relying on encryption

Common Use Cases

  • Securing sensitive documents and files
  • Password and credential protection
  • Database encryption and security
  • Email and message encryption
  • API key and token protection
  • Legal document confidentiality
  • Personal data privacy compliance
  • Secure communication channels