Starting from 1/9/2021 we are switching to v2 that is currently in beta state. this version is still going to be available online. learn more
Hat.sh 
v1.5
A Free, Fast, Secure and Serverless File Encryption.
files are not uploaded to a server, everything is done offline in your browser.
if you have a file that was encrypted before 8/12/2019 use this early build.