AES Encryption: Encrypt & Decrypt Text Online | Free Tool

A No. Without the correct password, the encrypted data is computationally impossible to decrypt.

A Yes, all encryption happens in your browser using the Web Crypto API. No data is transmitted.

A Yes.

A If you forget your password, the encrypted text becomes permanently inaccessible. AES-256-GCM is designed to be unbreakable without the correct key, meaning there's no recovery mechanism or backdoor. Always store your password securely, preferably using a dedicated password manager, to prevent data loss.

A Yes, the encrypted output is standard AES-256-GCM. As long as the other tool also uses AES-256-GCM with the same password and parameters (key derivation function, IV, salt), decryption should be successful. This tool uses the Web Crypto API, which adheres to standard cryptographic practices, ensuring broad compatibility with correctly implemented AES-256-GCM software and libraries.

A To securely share, first encrypt your text here, then copy the generated ciphertext. Send the ciphertext via a standard communication channel (e.g., email, messenger). Crucially, communicate the decryption password *separately* using a different, secure channel (e.g., verbally, secure messaging app, or a password manager). Never send the password and ciphertext together to avoid compromise.

A No, it stores nothing. Your text and password never leave your device. The Web Crypto API processes everything locally in your browser's memory. Once you close the tab, the data vanishes. For extra safety, clear your browser cache after encrypting sensitive content.

A That's actually a security feature called a 'salt' and 'IV' (initialization vector). This tool generates fresh random values for every encryption session, so you'll never see the same ciphertext twice—even for identical inputs. The output includes all three pieces: salt, IV, and the actual encrypted data, encoded together as a single string. Look closely; the first chunk changes each time. If you see duplicates, your browser might be caching old results. Clear your cache and retry.

A Yes, once the page loads fully, you can disconnect from the internet and it still works. The Web Crypto API is built into your browser, not a remote server. I tested this myself: loaded the page, turned off Wi-Fi, then encrypted 'test123' without issues. Just don't close the tab or you'll lose the page entirely. For frequent offline use, save the entire HTML file to your computer.

A Not really past a certain point. AES-256-GCM itself uses a 256-bit key derived from your password via key stretching. A 12-character random password is already overkill for that — more characters don't make the AES stronger. What matters more is password complexity. 'Password123' is weak regardless of length. Use 12+ random characters with symbols. The tool derives the key using PBKDF2 with 100,000 iterations, so a decent password is plenty.