You have not made a choice yet, so only strictly necessary storage is in use.
Strictly necessary
Keeps the site secure, remembers your session and this choice, and saves pages on your device so the site works offline. Always on.
Analytics
Counts page views and tool use so we can see what works. Visitor identifiers are hashed, never stored raw.
Advertising
Lets Google AdSense load and serve the ads that keep the tools free. Without it no ad script is requested at all.