Hangultools

Choseong extraction pulls out only the initial consonant (첫소리) from each Hangul syllable. For example, "한글" becomes "ㅎㄱ." This is widely used in Korean search engines and autocomplete systems to allow users to search by typing just the first consonants of a word — a common pattern in Korean mobile input and directory search.

Choseong extraction keeps only the initial consonant of each syllable. Jamo separation decomposes every syllable into all three components — initial consonant (초성), vowel (중성), and final consonant (종성). For example, "한" separated is "ㅎ + ㅏ + ㄴ," while choseong extraction gives only "ㅎ."

This tool uses the Revised Romanization of Korean (국어의 로마자 표기법), the official system adopted by the South Korean government in 2000. It uses the consonant and vowel mapping tables defined by the Ministry of Culture — for example, ㄱ becomes "g" as an initial, and ㅏ becomes "a." This is the system used in Korean passports and street signs.

Yes. The "Combine Jamo" mode accepts a sequence of individual consonant and vowel characters and assembles them into properly composed Hangul syllable blocks. For example, entering "ㅎㅏㄴㄱㅡㄹ" produces "한글." The tool correctly handles cases where a jongseong consonant becomes a choseong of the next syllable.

Yes. Non-Hangul characters — including English letters, numbers, punctuation, and spaces — are passed through unchanged. Only characters in the Hangul syllable block range (U+AC00–U+D7A3) are transformed. This makes it safe to process mixed-language content without losing any non-Korean text.

There is no hard limit enforced by the tool. Since all processing is done client-side in JavaScript, performance is constrained only by your device's memory and processing speed. For typical text inputs of a few thousand characters, results are instant. Very large documents may take a moment on lower-powered devices.

The romanization this tool produces follows the official Revised Romanization rules but applies them character by character without phonological context rules (such as consonant assimilation across syllable boundaries). For most purposes — learning, documentation, and casual use — the output is accurate. For official name transliteration in passports or legal documents, consult the full phonological rules.

Yes, Hangul Tools is completely free with no usage limits. It runs entirely in your browser using standard JavaScript — no installation, no browser extension, no account, and no subscription required. Your text data is never transmitted to any server.