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URL Encoding

Best url encoder online: http://www.robertgraham.com/tools/mailtoencoder.html

About.com's mailto encoder: http://email.about.com/library/misc/blmailto_encoder.htm

How are characters URL encoded?

URL encoding of a character consists of a "%" symbol, followed by the two-digit hexadecimal representation (case-insensitive) of the ISO-Latin code point for the character.

Example

Space = decimal code point 32 in the ISO-Latin set.
32 decimal = 20 in hexadecimal
The URL encoded representation will be "%20"

The box below allows you to convert content between its unencoded and encoded forms. The initial input state is considered to be "unencoded" (hit 'Convert' at the beginning to start in the encoded state.) Further, to allow actual URLs to be encoded, this little converter does not encode URL syntax characters (the ";", "/", "?", ":", "@", "=", "#" and "&" characters)...if you also need to encode these characters for any reason, see the "Reserved characters" table below for the appropriate encoded values.

NOTE:
This converter uses the String.charCodeAt and String.fromCharCode functions, which are only available in Javascript version 1.2 or better, so it doesn't work in Opera 3.x and below, Netscape 3 and below, and IE 3 and below. Browser detection can be tiresome, so this will just fail in those browsers...you have been warned. 8-}

No
Encoding URL-Safe
Encoding

Character	Code Points (Hex)	Code Points (Dec)
Dollar ("$") Ampersand ("&") Plus ("+") Comma (",") Forward slash/Virgule ("/") Colon (":") Semi-colon (";") Equals ("=") Question mark ("?") 'At' symbol ("@")	24 26 2B 2C 2F 3A 3B 3D 3F 40	36 38 43 44 47 58 59 61 63 64

Character	Code Points (Hex)	Code Points (Dec)	Why encode?
Space	20	32	Significant sequences of spaces may be lost in some uses (especially multiple spaces)
Quotation marks 'Less Than' symbol ("<") 'Greater Than' symbol (">")	22 3C 3E	34 60 62	These characters are often used to delimit URLs in plain text.
'Pound' character ("#")	23	35	This is used in URLs to indicate where a fragment identifier (bookmarks/anchors in HTML) begins.
Percent character ("%")	25	37	This is used to URL encode/escape other characters, so it should itself also be encoded.
Misc. characters: Left Curly Brace ("{") Right Curly Brace ("}") Vertical Bar/Pipe ("\|") Backslash ("\") Caret ("^") Tilde ("~") Left Square Bracket ("[") Right Square Bracket ("]") Grave Accent ("`")	7B 7D 7C 5C 5E 7E 5B 5D 60	123 125 124 92 94 126 91 93 96	Some systems can possibly modify these characters.