I've built a lightweight, fully standalone open-source HTML file that lets you perform high-security key derivation and encryption directly in your browser — no installation, no servers, no tracking.
Core features:
Encrypt any message or text offline using strong, modern cryptography
Everything stays client-side: the encrypted output is generated entirely on your device
The only identifier used is a standard Nostr public key (npub...) — no accounts, no emails, no additional metadata required
Distribution flexibility (your choice):
Built-in support for 5 privacy-respecting options out of the box:
Nostr (e.g. via DMs or public notes)
NTFY
Blossom
DPASTE
IPFS
Works especially well in combination with:
timeseed.io — for simple, memorable time-based or password-derived keys
GnuPG/OpenPGP — for hybrid workflows or verifying/adding signatures
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Support my work (it's all Value 4 Value ) this tool took a few months to build / research and test.