Where is my note stored?

In this browser's localStorage, encrypted with AES-GCM 256. There is no server, no sync, no cloud. If you clear your browser data, the note is gone.

What happens if I forget my passphrase?

The note is unrecoverable. AES-GCM authenticated encryption means there's no backdoor — even we can't help. Pick a passphrase you can remember, or store it in a password manager.

Is the passphrase stored anywhere?

No. The passphrase is used to derive a key via PBKDF2 (100,000 iterations, fresh salt) and then discarded from memory. Only the encrypted ciphertext and the random salt are persisted.

Can I sync notes between devices?

Not directly. This is intentionally local-only. If you want portability, copy the encrypted ciphertext string and paste it on another device (a future export/import flow may be added).

How is this different from text-encrypt-decrypt?

Text-encrypt-decrypt is a one-shot encrypt/decrypt for sharing ciphertext. Secure Notes is a persistent notepad — it remembers your note between visits, encrypted at rest, decrypted on unlock.

Is this safe for high-value secrets?

Good for moderate-sensitivity notes. For high-value secrets (seed phrases, master passwords) prefer a dedicated password manager or hardware-backed encryption — those add stronger KDFs (Argon2, scrypt) and hardware key storage.

Secure Notes

A local-only encrypted notepad — passphrase-locked with AES-GCM 256.

100% private — no uploads Security & Crypto ToolsFree & unlimited Read tutorial

See how it works

Watch a quick simulation of this tool in action — no file needed.

How to use Secure Notes

Follow these steps — everything happens instantly in your browser.

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Step 1. Pick a strong passphrase — it's the only key to your note.
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Step 2. Type your note in the textarea (credentials, secrets, ideas).
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Step 3. Click “Encrypt & save locally” — the note is encrypted with AES-GCM and stored in localStorage.
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Step 4. Come back any time, enter the same passphrase to decrypt and continue.
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Step 5. Use “Lock” to clear the screen, or “Delete note” to wipe it permanently.