Turn text into something safe to put in a query string, or take a string full of %20 and read what it actually says. Whatever is in the box is treated as one value, so a whole address has its colons and slashes escaped as well. It converts as you type, but switching Direction does not re-run it on its own. Press Convert after you switch.
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You can paste one, but the box is treated as a single value: https://example.com/a?q=1 comes back as https%3A%2F%2Fexample.com%2Fa%3Fq%3D1. That is what you want for one parameter, and not what you want for an address.
Letters, digits and - _ . ! ~ * ' ( ). Everything else becomes a percent sign and two hex digits, and anything outside ASCII is encoded as its UTF-8 bytes, which is why é comes back as %C3%A9.
Because this is percent encoding; the plus convention belongs to form bodies. Decoding does not reverse it either. A + in the input stays a plus rather than becoming a space, so replace those yourself before you decode.
Two reasons: a % that is not followed by two hex digits, which a line like 100% done is enough to trigger, and percent bytes that do not form valid UTF-8, such as %FF on its own. Either one stops the whole string; you do not get a partly decoded result.
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