Simple Base Converter is an easy way to convert text to and from different numeral systems such as decimal and hexadecimal. You can also see which Unicode character those numerical values translate to (up to 16 bit code points).

You can use this app to convert to and from:
+ Decimal
+ Hexadecimal
+ Unicode
+ Base64

You can also get outputs of different hash functions; Currently the app only shows outputs for:
+ MD5
+ SHA256
+ SHA512
(more coming soon)