HTML Minify / Beautify

It removes comments and collapses redundant whitespace between tags to shrink the file size.

Usually not, but be careful with whitespace-sensitive inline elements, like text next to a span or a link, since collapsing the whitespace between them can remove a visible space in the rendered page.

No — Beautify reflows the minified markup into readable indentation, but comments already stripped by minification can't be restored; the tool runs fully in your browser.