Han Xin Code is China's national 2D barcode, with a square pattern in each corner. It's made to hold Chinese text compactly, and covers the whole of the Chinese standard GB 18030.

What it holds
Characters	Chinese, letters, digits and symbols, accented letters and most other alphabets - everything in GB 18030. Not emoji.
Length	Up to 7,827 digits or 4,349 letters, with Error correction L1.
Error correction	Automatic error correction, or L1 to L4: about 8%, 15%, 23% or 30% of the symbol can be lost and it still reads.
Readable text	None.

Settings
Size	Automatic size picks the smallest symbol the value fits, from 023x023 to 189x189 modules. When the value doesn't fit the size you chose, Labeljoy uses a bigger one.
Error correction	Automatic error correction starts at L1 and goes as high as the size allows. With a fixed Size it's greyed out and set to Automatic error correction.
Character Set	Default character set is GB 18030, as the standard has it. UTF-8 holds any character, but only a scanner set up for it reads it right; ASCII and ISO 8859-1 (Latin-1) hold no Chinese.

Characters you can't type. A tilde followed by three digits is the character with that code - ~013 is a carriage return - and ~~ is a tilde.

The rest of the settings - quiet zone, color - are in the Barcode section.

What goes wrong
Input data too long for selected error correction.	The value doesn't fit even the largest Han Xin Code with that Error correction: choose a lower one, or Automatic error correction.
Some characters don't fit in this character set: choose UTF-8 in Character Set.	The value has a character the Character Set can't hold - with Default character set, an emoji.