What is the difference between parameter and full URL?

In parameter mode, marks like / ? & = are encoded too, which is right for values inside a link. In full URL mode, they are kept.

Why does a space sometimes become +?

HTML forms use + instead of a space. When decoding, the "treat + as a space" option handles that.

Convert text into the format web addresses accept, and decode links full of codes like %20 and %C3%A9.

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ActionEncode

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Everything is processed in your browser. Your text and files are never sent to a server.Questions about this tool?

Encode text for use in URLs, like a space as %20, or decode URLs full of % codes. Free and right in your browser.

What is the difference between parameter and full URL?: In parameter mode, marks like / ? & = are encoded too, which is right for values inside a link. In full URL mode, they are kept.
Why does a space sometimes become +?: HTML forms use + instead of a space. When decoding, the "treat + as a space" option handles that.