Katakana Letter Do

Enter do, then convert to full-width katakana.

With Japanese Latin-letter input, also called romaji, do in hiragana mode first produces ど. Microsoft Japanese IME documentation, as of 2026-09-06, specifies F7 to convert text still being composed to full-width katakana; then confirm the result.

ド can also be represented as ト followed by a combining dakuten, a mark attached to the preceding character. The two forms can look alike while containing different character sequences.

What does ド mean?

It represents /do/; the surrounding word gives it meaning.

Katakana is one of the writing systems used in Japanese. It appears in foreign words and names, technical terms, sound effects, and for emphasis. Katakana spelling alone does not show that a word came from another language.

How did katakana develop?

Katakana grew from abbreviated man’yōgana: Chinese characters used for their sounds. In the early 9th century, Buddhist scholars placed these fragments between lines of Chinese text to record Japanese readings.

Katakana forms had standardized by the 12th century, and the modern set was officially settled in 1900. These milestones describe the script’s development, not the first appearance of the exact marked form ド.