%20 for a space or %C3%A9 for an accented letter, and you want the plain version. It reverses that escaping so spaces, ampersands, and accented characters read normally again.
If the decoded text is in a character set other than UTF-8, you can turn on the encoding option to have it converted as well.
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Sample data
This parser takes no settings of its own. It simply decodes the percent-escapes in the incoming text. Input:%C3%A9 becomes é, %20 becomes a space, and %26 becomes &.