Free Online Text Encryption & Decryption Tool
Secure your sensitive messages with our free, client-side text encryption tool. Supports AES, DES, RC4, Rabbit, TripleDES and HMAC algorithms. No data leaves your browser.
Why Choose Our Encryption Tool?
🔒 No Registration Required
Start encrypting instantly – no sign-up, no email, no hassle.
🛡 Privacy First
All encryption happens locally in your browser. Your text and keys are never sent to our server.
💰 100% Free
No hidden costs, no premium tiers. Encrypt and decrypt as much as you want.
∞ Unlimited Usage
No limits on text length or number of operations. Use it anytime.
📱 Works on All Devices
Fully responsive design – use it on desktop, tablet, or mobile.
📶 Offline Capable
Once loaded, the tool works even without internet (PWA ready).
Supported Encryption Algorithms
| Algorithm | Type | Description |
|---|---|---|
| AES | Symmetric (reversible) | Advanced Encryption Standard – industry standard for secure symmetric encryption. |
| DES | Symmetric (reversible) | Data Encryption Standard – legacy algorithm, use for compatibility. |
| RC4 | Symmetric (reversible) | Rivest Cipher 4 – stream cipher, fast but less secure than AES. |
| Rabbit | Symmetric (reversible) | Rabbit stream cipher – high performance and secure. |
| TripleDES | Symmetric (reversible) | Triple DES – applies DES three times for improved security. |
| HmacMD5 | HMAC (one-way) | Hash-based Message Authentication Code using MD5 – provides integrity and authenticity. |
| HmacSHA1 | HMAC (one-way) | HMAC with SHA‑1 – widely used for API authentication. |
| HmacSHA256 | HMAC (one-way) | HMAC with SHA‑256 – recommended for modern applications. |
| HmacSHA512 | HMAC (one-way) | HMAC with SHA‑512 – strongest hash output, high security. |
How to Encrypt & Decrypt Text
| Step | Description |
|---|---|
| 1 | Type or paste your text into the 'Encrypt' input area. |
| 2 | Choose an algorithm from the dropdown and enter your secret key. |
| 3 | The encrypted result appears instantly. Click the copy button to save it. |
| 4 | To decrypt, paste the ciphertext into the 'Decrypt' box, select the same algorithm and key. |
Frequently Asked Questions
Is my data safe? Does the tool store anything?
Absolutely. All encryption and decryption happen directly in your browser using JavaScript. Your text and keys never leave your device, and we do not store any data on our servers.
What is the difference between symmetric and HMAC algorithms?
Symmetric algorithms (AES, DES, RC4, Rabbit, TripleDES) are reversible: you can encrypt with a key and decrypt with the same key. HMAC algorithms are one-way: they produce a fixed-length hash that verifies message authenticity, but cannot be decrypted back to the original text.
Can I decrypt a message encrypted with HMAC?
No, HMAC is not an encryption algorithm – it's a keyed-hash message authentication code. It provides integrity and authenticity, but the original message cannot be recovered from the HMAC output.
What if I forget my secret key?
Symmetric encryption keys are essential for decryption. If you lose the key, the encrypted data cannot be recovered. Store your keys securely.
Secure Your Messages with Client-Side Encryption
Whether you need to protect personal notes, share confidential information, or verify message integrity, our online text encryption tool offers a simple, private, and free solution. With support for multiple algorithms and a clean interface, you can encrypt and decrypt text in seconds – all without compromising your privacy.