URL and HTML encoding

Type url followed by some text to encode or decode it. If the text is a URL, or a list of key=value pairs, you also get a table of its parts.

Commands

Type	You get
url <text>	URL-encoded and URL-decoded versions, plus a table when the text is a URL or query string
urlencode <text> / urldecode <text>	Only the encoded, or only the decoded, form
html <text>	HTML-escaped and HTML-decoded versions
htmlencode <text> / htmldecode <text>	Only one direction
qs <url or query string>	The table only. query works too

Enter copies the selected row. In the table, click Copy next to any value.

URL encoding

• Component encoding (what encodeURIComponent does) escapes everything except letters, digits and - _ . ! ~ * ' ( ). Use it for a single value inside a URL.
• Whole URL encoding keeps : / ? & = # so the address still works, and only escapes spaces and other unsafe characters.
• Decoding shows a second version with + turned into a space, the way HTML forms write query strings. Text that is not valid percent-encoding (a % without two hex digits) is reported instead of being guessed.

The table

For https://user:pw@example.com:8080/a%20b?x=1&y=two+words#top it shows scheme, user, host, port, path, query, fragment and origin, then every parameter decoded. A password is hidden as ••••. A key that appears more than once is marked ×. You can paste a query string alone (?a=1&b=2 or a=1&b=2).

HTML entities

• Escaping changes & < > " ' into & < > " '. A second row also writes everything outside plain ASCII as numeric entities (é becomes é).
• Decoding reads numeric (A) and hex (A) entities and about forty common named ones ( , ©, …, —, arrows, quotes). Names it does not know are left as they are.

Everything is worked out in your browser; nothing you type is sent anywhere. Copied rows are saved in Recent. Both tools are also widgets: URL encoder and parser and HTML entities.