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English to Korean speech translation API

Stream English (English) speech and get Korean (한국어) back in real time. One WebSocket, ISO codes en to ko, and ultra-low latency for voice agents and live apps.

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Production-ready English to Korean translation API

Real English speech includes accents, regional dialects, code switching, and domain-specific vocabulary. Soniox recognizes it in a single model and streams Korean while the speaker is still talking.

English (Indo-European > Germanic > West Germanic) and Korean (Koreanic) come from different language families, so word order and morphology differ. Soniox reorders meaning in-stream instead of word by word.

English is written in Latin and Korean in Hangul, so Soniox emits correctly scripted Korean text.

A breakthrough in real-time English to Korean translation

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Translate before the sentence ends

Korean meaning lands as English is spoken, not after the caption catches up.

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Directional en to ko streaming

Set the source and target codes once. Both arrive in a single labeled token stream.

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High quality Korean output

Same model across every language, including historically underserved ones.

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Native-speaker English STT accuracy

Accurate Korean translation starts with accurate English recognition across accents and language switching.

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Names, numbers, and domain terms

Preserved across the pair, including phone numbers, emails, and IDs.

config.json
{
  "model": "stt-rt-v4",
  "translation": {
    "type": "one_way",
    "source_language": "en",
    "target_language": "ko"
  }
}

English and Korean through a single stream

English to Korean translation is built on top of Soniox Speech-to-Text API. Every spoken word is transcribed, and Korean translation streams mid-sentence in the same labeled token stream.

Turn it on by adding a translation block with source_language: "en" and target_language: "ko". It runs on the same WebSocket and the same model, with no extra round trip.

Live English to Korean: written and spoken

English to Korean speech-to-text

micLive English speecharrow_right_altsubjectKorean text

Translate live English into written Korean with the Soniox STT API. Soniox streams the English transcript and the Korean translation as speech happens.

Use it for Korean captions, subtitles, meeting translation, agent assist, and multilingual transcription.

English to Korean speech-to-speech

micLive English speecharrow_right_altvolume_upSpoken Korean

Build full spoken English to Korean translation by combining Soniox STT and Soniox TTS. Soniox recognizes English, translates it, and speaks Korean with low latency.

Use it for live interpreters, bilingual voice agents, travel assistants, and customer support.

Live English to Korean translation in action

Stream English to Korean one-way to push all speech into Korean, or two-way to keep a bilingual conversation flowing between the two languages.

voice_selection
English speaker says: “Oh, FYI, the client moved the demo to 9:30, so we’re not totally sprinting.”
translate
Translated into Korean in real time.

One-way translation

Translate live English into Korean. Everyone in the conversation sees the same translated stream.

Ideal for live captions, multilingual meetings, broadcasts, lectures, and customer calls.

voice_selection
English speaker talks in English.
hearing
Korean speaker hears Korean.
voice_selection
Korean speaker replies in Korean.
hearing
English speaker hears English.

Two-way translation

Translate between English and Korean for live bilingual conversation. Each side speaks naturally and hears the other in their own language.

Soniox supports real-time two-way translation between any two of 60+ supported languages.

Accurate on both ends of the pair

Soniox transcribes English at 6.5% word error rate and Korean at 4.3% word error rate. Accurate recognition on both sides is what makes the translation reliable.

speech_to_text

Speech-to-Text

Native-speaker accuracy across 60+ languages, with support for multilingual speech, alphanumerics, speaker diarization, context.

translate

Translation

Real-time streaming translation across 3,600 language pairs, built for high quality and low delay across all supported languages.

text_to_speech

Text-to-speech

High-fidelity speech generation in 60+ languages, built for names, alphanumerics, language switching, and ultra-low-latency streaming.

Together, they create a complete real-time low-latency speech AI platform.

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About English and Korean

English has roughly 1,500,000,000 speakers across United States, United Kingdom, Canada, and Australia. Korean has roughly 81,700,000 speakers across South Korea, North Korea, and United States.

English is the most widely spoken language in the world when including both native and non-native speakers.

The Korean alphabet, Hangul, was created in 1443 by King Sejong the Great to promote literacy.

Soniox makes English to Korean usable in real-time translation across every supported pair.

Translate English to any language

From English to Korean, or English to any of 60+ supported languages. All real-time.

AfrikaansAlbanianArabicAzerbaijaniBasqueBelarusianBengaliBosnianBulgarianCatalanChineseCroatianCzechDanishDutchEstonianFinnishFrenchGalicianGermanGreekGujaratiHebrewHindiHungarianIndonesianItalianJapaneseKannadaKazakhKoreanLatvianLithuanianMacedonianMalayMalayalamMarathiNorwegianPersianPolishPortuguesePunjabiRomanianRussianSerbianSlovakSlovenianSpanishSwahiliSwedishTagalogTamilTeluguThaiTurkishUkrainianUrduVietnameseWelsh

Related translation pages

swap_horizTranslate Korean to Englisharrow_right_alttranslateEnglish speech translationarrow_right_alttranslateKorean speech translationarrow_right_altarrow_right_altEnglish to Dutcharrow_right_altarrow_right_altEnglish to Germanarrow_right_altarrow_right_altEnglish to Afrikaansarrow_right_alt

Frequently asked questions

How do I translate English to Korean with the API?arrow_downward
Add a translation block to your real-time request with source_language "en" and target_language "ko". Soniox transcribes English and streams the Korean translation over the same WebSocket.
Is English to Korean translation real-time?arrow_downward
Yes. Soniox streams Korean while English is still being spoken, so meaning arrives mid-sentence instead of after the sentence ends.
What about translating Korean to English?arrow_downward
That direction is supported too. See the Korean to English page, or use two-way translation to run both directions in one session.
Does Soniox handle Latin to Hangul output?arrow_downward
Yes. Soniox outputs correctly scripted Korean text in Hangul directly in the token stream.
Does Soniox handle English dialects and accents?arrow_downward
Yes. Soniox handles English dialects like American English, British English, and Australian English in a single model, so Korean translation stays accurate across regions.
Which other providers support English to Korean?arrow_downward
Based on their public docs, OpenAI, Azure, and Speechmatics list both English and Korean for real-time translation. Soniox is the only one that also supports two-way live translation across 60+ languages.
How fast is English to Korean translation?arrow_downward
Soniox streams Korean as English is being spoken, with ultra-low latency. Translation arrives before the sentence ends.

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