URL encoding, is a mechanism for encoding information in a Uniform Resource Identifier (URI) because URLs can only be sent over the Internet using the ASCII character-set. Since URLs often contain characters outside the ASCII set, the URL has to be converted into a valid ASCII format. URL encoding replaces unsafe ASCII characters with a “%” followed by two hexadecimal digits.
URL Encode Decode Tool encodes or decodes string according to RFC 3986 standard.
According to RFC 3986, the characters in a URL have to be taken from a defined set of unreserved and reserved ASCII characters. Any other characters are not allowed in a URL.
The unreserved characters can be encoded, but should not be encoded. The unreserved characters are:
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
a b c d e f g h i j k l m n o p q r s t u v w x y z
0 1 2 3 4 5 6 7 8 9 - _ . ~
The reserved characters have to be encoded only under certain circumstances. The reserved characters are:
! * ' ( ) ; : @ & = + $ , / ? % # [ ]
Reserved characters after percent-encoding
! # $ & ' ( ) * + , / : ; = ? @ [ ]
%21 %23 %24 %26 %27 %28 %29 %2A %2B %2C %2F %3A %3B %3D %3F %40 %5B %5D
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