Many tools have a Share Link button that copies a self-contained URL recreating your current input. Examples: /multidecoder/#md=…, /multiencoder/#me=…, /tools/coordinateconverter/#cc=…, and similar hashes on the mapping and cipher pages.

The payload after the # is your tool input (e.g. cipher text and keys, or a coordinate string), compressed with LZ-String and URL-safe encoded. Everything needed to recreate the state is in that fragment.

A URL fragment (the part after #) never leaves your browser. Browsers do not include fragments in HTTP requests, so when you open or share a share-link URL, the server (CacheSleuth, Cloudflare, anyone else) sees only the path, not the encoded input. The page loads, JavaScript reads the fragment locally, and the inputs are recreated in your browser.

However, anyone you share the URL with can recover the original input by opening the link, since the payload is encoded (compressed) but not encrypted. Don't paste sensitive information into a share link and then post it publicly. Treat a share link the same as you'd treat a screenshot of the tool with your input visible.