Security

AES Text Encryption

Encrypt or decrypt text with a passphrase using AES-256-GCM.

Runs entirely in your browser, nothing is uploaded

Text to encryptPassphrase

AES-256-GCM with a PBKDF2-derived key, entirely in your browser via the Web Crypto API. Losing the passphrase means losing the data; there is no recovery.

How it works

1
You choose a passphrase
A key is derived from your passphrase with PBKDF2 and a fresh random salt, so the same passphrase does not produce the same key twice.
2
The text is encrypted in the page
Encryption uses AES-256-GCM through the browser’s Web Crypto implementation. Your text and passphrase never leave the tab.
3
Share the result, not the passphrase
The output carries the salt and nonce it needs to be decrypted later. The passphrase has to reach the other person some other way.

Practical guidance

GCM detects tampering, so a wrong passphrase or an edited ciphertext fails cleanly rather than producing plausible looking nonsense.
The strength of this rests entirely on your passphrase. A short one can be attacked offline no matter how good the cipher is.
There is no recovery. Lose the passphrase and the text is gone.

AES Text Encryption

How it works

You choose a passphrase

The text is encrypted in the page

Share the result, not the passphrase

Practical guidance

People usually pair this with

Character Frequency Analyzer

ROT13 & Morse Code

AES Text Encryption

How it works

You choose a passphrase

The text is encrypted in the page

Share the result, not the passphrase

Practical guidance

People usually pair this with

Character Frequency Analyzer

ROT13 & Morse Code