Code Compression
You can minify your HTML, CSS, and JavaScript files so that they load fast and become hard to copy.
Sites that allow you to do so include:
http://skalman.github.io/UglifyJS-online/
http://www.willpeavy.com/minifier/
https://html-css-js.com/js/compressor/
https://javascript-minifier.com/
https://www.minifier.org/
http://minifycode.com/html-minifier/
You can also reverse the process. Sites that 'unminify' obfuscated code include:
https://unminify.com/
https://www.unminify2.com/
https://www.ipvoid.com/js-unminify/
https://www.unminified.com/
Assets bundlers such as Webpack, Parcel, and Browserify inherently minimize codes for you.