I built this tool because I noticed a massive gap for professionals on the move—lawyers, executives, and digital nomads who often find themselves trapped on terrible airport Wi-Fi, working from hotel business centers, or using public terminals. Traditional local options like VeraCrypt or 7-Zip require full machine installation permissions, while modern cloud encryptors require an active, trusted internet connection. Encryption 1 solves this by packing heavy, military-grade security into a single, portable HTML file. You can throw it on a thumb drive, drop your device into Airplane Mode, bundle your text notes and sensitive documents into a single package, and download your vault with 100% certainty that no server ever saw your data. Features at a glance: • Local AES-GCM 256-bit encryption via native WebCrypto • Hardened key derivation using 250,000 PBKDF2 iterations • Multi-file grouping (up to 5 documents packaged together) • A bonus offline layout: EC-1 Journal for private diaries The project is fully open-source (MIT licensed) and completely free. I'd love for the security and developer minds here to audit the source code, play around with the multi-file bundling, and let me know your thoughts! What features or additional layouts should I build into version 2.2? Let me know in the comments below! 👇 - Seán

Encryption 1™

Your private zero-install, offline file & text encryptor

Your private zero-install, offline file & text encryptor