Convert text to binary and the other way for any string input.
Convert text to hexadecimal and the other way for any string input.
Convert text to ascii and the other way for any string input.
Convert text to octal and the other way for any string input.
Decode Base64 input to an image.
Validate JSON content and make it looks good.
Convert a unix timestamp to UTC and your local date.
Convert a particular date to the unix timestamp format.
Transform an image input to a Base64 string.
Use the Google translator API to generate text to speech audio.