AES-GCM Encrypt & Decrypt Text Online
Encrypt and decrypt any text with AES-GCM directly in your browser. No server, no storage, no registration. Paste your text, enter a key, done.
AES Key (hex)
Plaintext
How it works
This tool uses the WebCrypto API built into your browser — no external libraries. Text is encrypted with AES-256-GCM, a modern authenticated cipher that also detects any tampering. A fresh random 12-byte IV is generated for every encryption, so the same plaintext produces a different ciphertext each time. The output format [LOCKI:v2:…] matches what the Locki browser extension produces, so ciphertext created here can be decrypted by the extension and vice versa.
When to use this tool
- 1Quickly encrypt a password before sending it in Slack
- 2Verify that encrypted text decrypts correctly with your key
- 3Share sensitive information over email without risk
For teams
This tool is great for one-off encryption. If your team regularly shares sensitive data, Locki's browser extension lets you encrypt directly inside Slack, Gmail, and Jira — with centralized key management and audit logs.
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