teaching tool

Learn character encoding,
one bit at a time.

Interactive exercises to take apart UTF-8, UTF-16 and UTF-32 - by hand, no calculator, step-by-step validation. For developers who actually want to understand the bit-level mechanics.

Start an exercise Try the sandbox

preview

Not just a sandbox.
A coach that corrects you bit by bit.

Each exercise is broken into steps. You encode or decode by hand, and the app tells you exactly where you got it wrong - in plain words.

Step-by-step validation, not just at the end
Errors explained in plain English, not error codes
Code points drawn at random - no end
UTF-8, UTF-16, UTF-32 - encode and decode, with graded levels

6 modules to practise with

code point → bytes

bytes → code point

endianness + BOM

surrogate pairs included

Encode UTF-32

fixed 4 bytes, padding

Decode UTF-32

explicit endianness, 4 bytes → code point

Learn character encoding,one bit at a time.

Not just a sandbox.A coach that corrects you bit by bit.

6 modules to practise with

Learn character encoding,
one bit at a time.

Not just a sandbox.
A coach that corrects you bit by bit.