Useful encoder and decoder features could be added.
Let's replace the Time link as it is not implemented anyway, with Encode.
As suggested by @kaushikdeb, URL encoding would be nice to have.
URL encoding
BASE64 encoding
Ways to go about it:
Either have
Two new pages, one for encoding and one for decoding. Each can then evolve to support more encoding and decoding respectively.
or
A single page with two buttons, decode or encode.
I much prefer the first approach, from a usability perspective it simplifies the interface, single button like all other pages;
Once done, perhaps move the BASE64 encoding that is currently displayed as a result of the Hash functions table.