URL Encoder / Decoder tools are software tools that help encode or decode URLs (Uniform Resource Locators). URLs are used to identify and locate resources on the internet, such as web pages, images, videos, and other digital media.

URL encoding is the process of converting a URL into a format that can be transmitted over the internet. This is necessary because some characters, such as spaces and special characters, are not allowed in URLs. URL encoding replaces these characters with a percent sign followed by a two-digit hexadecimal representation of the character.

URL decoding is the process of converting an encoded URL back into its original form. This is necessary when receiving encoded URLs from the internet, such as in the query string of a URL.

URL Encoder / Decoder tools provide an easy and convenient way to perform these encoding and decoding operations. Users can simply enter the URL into the tool, and it will automatically encode or decode it as needed. These tools are widely available online as web applications or browser extensions and can also be integrated into programming languages as libraries.