SimpleCrypt

Simply encrypt a file by choosing a passphrase. The file can be later decrypted on web, mobile or on chrome. ✔ Strong AES encryption (read more: http://en.wikipedia.org/wiki/Advanced_Encryption_Standard) ✔ Easy to use (choose a file, choose passphrase and you're done) ✔ Accessible anytime, anywhere: through the app, via the web site, on mobile (simple browse to http://simple-crypt.appspot.com/) ✔ Privacy by design (no ads, no data collection)

Screenshots from Chrome Web Store