AES Encrypt / Decrypt
The AES Encrypt / Decrypt tool protects data with the Advanced Encryption Standard. It runs locally, so your plaintext and key never leave the browser. Use it to secure notes, config snippets or small files before sharing.
Key Features
- AES-256 with CBC and GCM modes
- Password-based key derivation
- Encrypt text or files
- Base64 or hex output
- No upload, fully local
Use Cases
- Secure a private note before sending
- Encrypt a config file for storage
- Demo AES to students
- Verify a cipher you produced elsewhere
How to Use
- Pick encrypt or decrypt
- Choose the mode and enter a passphrase
- Paste the text or pick a file
- Read the ciphertext output
Practical Tips
- GCM also provides integrity, not just confidentiality
- Use a long random passphrase, not a word
- Lost keys are unrecoverable by design
FAQ
- Is my data uploaded?
- No, all cryptography happens in your browser.
- Which mode should I use?
- GCM for new work; CBC only for compatibility.