Converting text safely between formats and encodings
Encoding tools are useful when text has to move between web forms, APIs, files, URLs, tokens, or systems that expect a specific representation. This category covers common transformations such as URL encoding, Base64, entities, escape sequences, and other text-safe formats. The goal is usually not to change the meaning of the text, but to make it safe or valid for a particular destination.
The main thing to watch is direction. Encoding and decoding are opposite operations, and applying the same step twice can produce a string that looks valid but no longer represents the original input. Also remember that many encodings are not encryption. Base64, for example, is easy to reverse and should never be treated as a way to protect secrets.