Encrypt and decrypt text using AES, DES, Triple DES, RC4 and Rabbit — entirely in your browser. Secure your messages with a secret key. No data ever leaves your device.
What is Text Encryption?
Text encryption is the process of converting readable plain text into an unreadable scrambled format (ciphertext) using a cryptographic algorithm and a secret key. Only someone with the correct key and algorithm can reverse the process and read the original message.
Our free Encryption Tool supports AES, DES, Triple DES, RC4, and Rabbit algorithms — all powered by the CryptoJS library running entirely in your browser. No text or keys are ever sent to any server.
Use it to encrypt sensitive messages before sharing them, store confidential notes securely, protect API keys and tokens, or learn how different encryption algorithms work.
5
Algorithms supported
AES, DES, 3DES, RC4, Rabbit
256-bit
Max key strength
AES-256 — military-grade encryption
< 1ms
Encryption speed
Instant in-browser processing
0
Data sent to server
Everything runs locally in your browser
How to encrypt and decrypt text?
Protect your messages in 4 simple steps.
Choose Algorithm
Select an encryption algorithm from the dropdown. AES is recommended for most use cases.
Enter Secret Key
Type a strong secret key. The same key must be used to decrypt. Keep it private and safe.
Type Your Text
Enter the plain text you want to encrypt — a message, note, or any string of text.
Encrypt & Share
Click Encrypt, copy the ciphertext. Share it safely. Only the key holder can decrypt it.
Everything in one encryption tool
Multiple algorithms, real-time output, and full browser-side privacy.
5 Algorithms
AES, DES, Triple DES, RC4 and Rabbit — choose the right cipher for your needs.
100% Private
All encryption runs in your browser. Your text and keys never leave your device.
Real-time Encryption
See encrypted output instantly as you type — no button clicks needed.
Key Generator
Generate a cryptographically strong random key with one click.
One-Click Copy
Copy encrypted or decrypted output to clipboard instantly.
Download Output
Save encrypted text as a .txt file for offline storage.
Encrypt & Decrypt
Switch between encryption and decryption mode with a single click.
Mobile Friendly
Works on all devices — desktop, tablet and smartphone.
When to use encryption?
From personal privacy to professional security — encryption is essential.
Secure Messaging
Encrypt messages before sharing over email, chat, or social media.
Private Notes
Store sensitive notes, passwords, or credentials in encrypted form.
Developer Testing
Test encryption/decryption logic before implementing in your application.
Data Protection
Protect sensitive data before storing it in databases or files.
Learning Cryptography
Understand how AES, DES and other ciphers work through hands-on experience.
API Key Protection
Encrypt API keys and tokens before embedding in configuration files.
Get the most out of this tool
These tips will help you use encryption safely and effectively.
Use a strong key
A strong key should be at least 16 characters with a mix of letters, numbers, and symbols.
Save your key securely
Without the key, encrypted data cannot be recovered. Store it in a password manager.
Share key through a different channel
Never share the encrypted text and the key in the same message or email.
Prefer AES over DES
AES is the modern standard. DES and RC4 are considered weak — avoid for sensitive data.
Encryption ≠ Hashing
Encryption is reversible with a key. Hashing is one-way. Use hashing for passwords, encryption for data.
Use the same algo to decrypt
If you encrypted with AES, you must decrypt with AES and the exact same key.
Copy full ciphertext
Even one missing character in the ciphertext will cause decryption to fail.
Works offline
Once loaded, this tool works offline. CryptoJS runs entirely in your browser.
Is this tool 100% safe to use?
Yes — all encryption happens in your browser using CryptoJS. Your text and key never reach our servers.
- Encryption runs locally using CryptoJS library
- Your text and key are never sent to any server
- No cookies, no tracking, no account required
- Works offline once the page is loaded
- Not suitable for highly sensitive production data
- Never use Base64 — use proper encryption for real security
⚠️ Important Security Notes
- ›This tool is intended for learning, testing, and moderate-security use cases.
- ›For production apps with sensitive data, use server-side encryption with proper key management.
- ›Never encrypt passwords — use a one-way hashing algorithm like bcrypt or Argon2 instead.
- ›The security of your data depends entirely on keeping your secret key private.
- ›CryptoJS uses a custom key derivation — for maximum security use standard PBKDF2 with a salt.
Encryption: Complete Guide
What is symmetric encryption?
Symmetric encryption uses the same key to encrypt and decrypt. AES, DES, and RC4 are all symmetric ciphers. The sender and receiver must both have the same secret key. This makes key management critical — if the key is compromised, the data is exposed.
Why is AES the best choice?
AES (Advanced Encryption Standard) was adopted by the US government in 2001. It uses 128-bit blocks with key sizes of 128, 192, or 256 bits. It is fast, secure, and supported by hardware acceleration on modern CPUs. It is the gold standard for symmetric encryption.
Why is DES considered weak?
DES uses a 56-bit key, which can be brute-forced in less than 24 hours with modern hardware. It was deprecated by NIST in 2005. Triple DES (3DES) applies DES three times to increase security, but is still slower than AES and being phased out.
Block vs Stream ciphers
Block ciphers (AES, DES) encrypt data in fixed-size blocks. Stream ciphers (RC4, Rabbit) encrypt data one bit or byte at a time. Stream ciphers are generally faster for large data but have different security properties. AES in CTR mode combines the benefits of both.
How to choose a good key?
A good encryption key should be random, long (16+ characters), and contain uppercase, lowercase, numbers, and symbols. Never use dictionary words, birthdays, or predictable patterns. Use our built-in key generator for a cryptographically secure random key.
Important security warnings
This tool uses CryptoJS for client-side encryption — suitable for learning, testing and moderate security needs. For production applications storing highly sensitive data (healthcare, finance), use server-side encryption with proper key management (AWS KMS, HashiCorp Vault).
Frequently Asked Questions
Everything you need to know about text encryption.