URL & Web
Shorten links, generate QR codes, encode and decode URLs.
Tools for the addresses themselves — making a long link shareable, turning one into a scannable code, and escaping the characters that break a URL when it is passed through a query string.
The shortener is the one tool on the site that genuinely needs a server, because a short link has to resolve for someone else later. Its page says so, and it does not carry the browser-only badge.