CSS
Minifier

Typically 20–40% for hand-written CSS with comments and generous whitespace. Files with long comments can see reductions of 50% or more.

No. Minification only removes non-functional characters. The browser parses and applies minified CSS identically to the original.

Always minify the compiled CSS output, not the SCSS source. Minifying source files makes them unreadable for future development.

Use the CSS Beautifier to expand minified CSS back into readable form if you need to inspect or edit it.

There is no hard limit. Large stylesheets (several hundred KB) are processed without issues in modern browsers.