Encryption / Decryption
Encrypt text with AES-256-GCM using a password. Decrypt previously encrypted text. All encryption runs in your browser using the Web Crypto API - nothing is sent to any server.
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About Encryption / Decryption
Encrypt and Decrypt Text with Military-Grade Algorithms
Sensitive information deserves serious protection. Whether you are sharing confidential messages, storing private notes, or transmitting passwords through insecure channels, the Encryption / Decryption Tool lets you encrypt any text into an unreadable cipher and decrypt it back using a secret key that only you and your intended recipient know.
This tool runs entirely in your browser using industry-standard encryption algorithms. Your data never leaves your device, making it one of the most private ways to protect text-based information online.
How Encryption and Decryption Work Here
To encrypt, paste or type your plaintext message into the input field. Choose an encryption algorithm — the tool supports AES-256, which is the same standard used by governments and financial institutions worldwide. Enter a secret key or passphrase that will be required to decrypt the message later.
Click encrypt, and the Encryption / Decryption Tool transforms your readable text into an encoded string of seemingly random characters. This ciphertext can be safely shared over email, messaging apps, or any other channel. Even if someone intercepts it, they cannot read the original message without the secret key.
To decrypt, paste the ciphertext into the tool, enter the same secret key used for encryption, select the same algorithm, and click decrypt. The original plaintext message appears instantly.
Real-World Uses for Text Encryption
Sharing passwords is a common scenario. Suppose you need to send a database password to a colleague. Emailing it in plaintext is risky because email servers store copies and can be compromised. Instead, encrypt the password with the Encryption / Decryption Tool, send the ciphertext via email, and share the decryption key through a separate channel like a phone call or text message.
Journalists and activists working in sensitive environments use encryption to protect source identities and confidential communications. Even if their devices are seized, encrypted notes are useless without the key.
Lawyers exchanging privileged client information through digital channels add an extra layer of protection by encrypting sensitive details before transmission.
Developers who need to store API keys or configuration secrets temporarily use the tool to encrypt them before pasting into shared documents or ticketing systems.
Understanding Encryption Strength
AES-256 encryption is considered unbreakable with current technology. The 256 refers to the key length in bits, meaning there are more possible key combinations than atoms in the observable universe. No computer existing today or projected in the near future can brute-force an AES-256 encrypted message in a practical timeframe.
However, the encryption is only as strong as your key. A weak key like password123 can be guessed through dictionary attacks regardless of how strong the algorithm is. The Encryption / Decryption Tool encourages strong keys and can warn you if your chosen passphrase is too simple.
Tips for Secure Encryption Practices
Use long, random passphrases as your encryption key. A phrase like purple-telescope-marathon-7 is both memorable and extremely difficult to guess.
Never share the encryption key through the same channel as the encrypted message. If you email the ciphertext, share the key via phone, in person, or through a different messaging platform.
Keep a secure record of your encryption keys. If you lose the key, there is no way to recover the encrypted data. This is a feature, not a bug — it means no one else can recover it either.
For sensitive documents, consider encrypting them in layers. Encrypt once, then encrypt the result again with a different key. This provides defense in depth even if one key is compromised.
Privacy by Design
The Encryption / Decryption Tool processes everything locally in your browser. No data is sent to any server, no encryption keys are logged, and no plaintext or ciphertext is stored. Open it above and start protecting your sensitive information today.