Secure Notes
A local-only encrypted notepad — passphrase-locked with AES-GCM 256.
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.
Why use this tool
Private by design
All processing happens locally in your browser. Open DevTools → Network and you'll see zero file uploads. Ever.
Instant
No upload wait, no queue, no server round-trip. Results appear the moment you drop a file.
Free & unlimited
No accounts, no watermarks, no daily caps. Use it as many times as you like, forever.
Works everywhere
Desktop, tablet or phone — every tool is responsive and installable as a PWA for offline use.
Frequently asked questions
Everything you might want to know about secure notes.
Encrypt & Decrypt Text
AES-GCM 256 encryption with a passphrase — round-trip in your browser.
Password Generator
Strong random passwords generated locally with crypto.getRandomValues.
Passphrase Generator
Memorable multi-word passphrases — easier to type, harder to crack.
File Checksum
Compute SHA-1, SHA-256 and SHA-512 for any file — locally, never uploaded.