The keyboard is an external computer device that breaks easily but is indispensable, and it is in constant use, especially by programmers. Keyboards often develop problems, and it is really annoying when some letters or digits can no longer be typed after a keyboard fails. pcjson.com provides an online test of whether your keyboard keys work: every time you press a key on the keyboard, the matching key on the virtual keyboard is highlighted.
This tool belongs to the “Encryption & encoding” category.
Your input is processed locally in the browser whenever possible. We do not store it.
No. MD5 is a one-way digest — you can compare it, never reverse it. So-called "decryption" is a rainbow-table hit.
Salts, random IVs, or a different case or source encoding all change the output. Normalise to UTF-8 before comparing.
Use it for learning and format checks. Generate and store production keys server-side; never paste a live secret into a web page.