This is a small collection of online encoders and decoders able to handle URL encoding, BASE64 encoding, HEX and ASCII conversions etc.
https://www.base64decode.org/ (5) - Base64 encoding
http://meyerweb.com/eric/tools/dencoder/ (5) - URL encoding
http://string-functions.com/string-hex.aspx (5) - HEX to ASCII conversion
https://www.base64decode.org/ (5) - Base64 encoding
http://meyerweb.com/eric/tools/dencoder/ (5) - URL encoding
http://string-functions.com/string-hex.aspx (5) - HEX to ASCII conversion