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Grade 1 and Grade 2 braille: what actually changes
Grade 1 spells everything out. Grade 2 uses contractions. Here is when each is used and why Grade 2 exists at all.
Grade 1 is letter for letter
In Grade 1, or uncontracted braille, every printed letter gets its own cell. It is what beginners learn, what labels and signage often use, and what you want when accuracy matters more than speed — a password, a product code, a name with unusual spelling.
Grade 2 compresses
Grade 2, or contracted braille, replaces common letter groups and whole words with single cells. A standalone b means 'but'. One cell covers 'the', another covers 'ing'. Books and most published material use Grade 2 throughout.
Why contractions exist
Braille is bulky. A cell cannot shrink below what a fingertip can resolve, so a braille page holds far less than a printed one and an uncontracted novel can run to many heavy volumes. Contractions cut the length substantially, which is a real difference in cost, shelf space and reading speed rather than a stylistic preference.
The rules are positional
Contractions are not simple find-and-replace. A wordsign only applies when the word stands alone: b is 'but' by itself but just a b inside 'table'. Some groupsigns cannot start a word. This is why automatic Grade 2 output — including this site's — should be checked by a qualified transcriber before it is embossed for someone to rely on.