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Live Japanese speech translation API

Translate Japanese speech to and from 60+ languages in real time. Low-latency streaming, 3,600 language pairs, and accurate translation for voice agents, live captioning, and multilingual apps.

Production-ready Japanese speech translation API

Real conversations in Japanese include accents, regional dialects, code switching, and domain-specific vocabulary. Soniox is built to handle that variation in a single model, so live translation stays usable across regions and registers.

Soniox preserves formatting in the translated transcript, including names, numbers, addresses, IDs, and domain-specific terms.

Japanese belongs to the Japonic family. Soniox translates between Japanese and any of 60+ supported targets and 3,600 language pairs in total.

A breakthrough in real-time Japanese translation

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Translate Japanese before the sentence ends

Meaning lands as it's spoken, not after the caption catches up.

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Japanese paired with 60+ languages

Both source and target. 3,600 pairs total, not English-centric.

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High quality Japanese output

Same model across every language, including historically underserved ones.

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Native-speaker Japanese STT accuracy

Accurate translation starts with accurate recognition across accents, multilingual speech, and language switching.

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Japanese names, numbers, and domain terms

Preserved in both transcript and translation, including phone numbers, emails, and IDs.

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

Transcription + translation through a single stream

Japanese translation is built on top of Soniox Speech-to-Text API. Every spoken word is transcribed, and translation streams mid-sentence and both arrive together in a single labeled token stream.

Turn it on by adding a translation block to your request. Translation runs on the same WebSocket and the same model. Translated tokens come back interleaved with transcripts, with no extra round trip.

Live Japanese translation: written and spoken

Japanese speech-to-text translation

micLive Japanese speecharrow_right_altsubjectTranscript + translation

Translate live Japanese into written text with the Soniox STT API. Enable real-time translation with a config change. Soniox streams the Japanese transcript and translated text as speech happens.

Use it for Japanese captions, subtitles, meeting translation, agent assist, accessibility tools, and multilingual transcription.

Japanese speech-to-speech translation

micLive Japanese speecharrow_right_altvolume_upTranslated speech

Build full spoken Japanese translation by combining Soniox STT and Soniox TTS. Soniox recognizes Japanese, translates it in real time, and speaks the output in the target language with low latency.

Use it for live Japanese interpreters, bilingual voice agents, travel assistants, customer support, and real-time multilingual communication.

Live Japanese translation for captions, conversations and more

Stream live Japanese translation in two modes: one-way translates all speech into a single target language, two-way keeps a bilingual conversation flowing between Japanese and another language.

voice_selection
Japanese speaker says: “Slackで9:30にrescheduleって送っておくね。”
translate
Speech is translated into English (or any of 60+ target languages) in real time.

One-way translation

Translate live speech to or from Japanese into a single target language. Everyone in the conversation sees the same translated stream.

Ideal for live captions, multilingual meetings, broadcasts, lectures, customer calls, and products where many speakers need to be understood in one language.

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

Two-way translation

Translate between Japanese and another language 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.

Built on the Soniox speech AI platform

Japanese translation is powered by the same infrastructure behind Soniox STT and TTS.

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.

quiz
About Japanese

Japanese has roughly 125,000,000 speakers across Japan.

Japanese uses three writing systems simultaneously: kanji (Chinese characters), hiragana, and katakana.

Japanese uses three scripts simultaneously: kanji for content words, hiragana for grammar, and katakana for foreign words.

Translate between all languages

From Japanese to any supported language, or any supported language to Japanese. 3,600 language pairs, all real-time.

AfrikaansAlbanianArabicAzerbaijaniBasqueBelarusianBengaliBosnianBulgarianCatalanChineseCroatianCzechDanishDutchEnglishEstonianFinnishFrenchGalicianGermanGreekGujaratiHebrewHindiHungarianIndonesianItalianJapaneseKannadaKazakhKoreanLatvianLithuanianMacedonianMalayMalayalamMarathiNorwegianPersianPolishPortuguesePunjabiRomanianRussianSerbianSlovakSlovenianSpanishSwahiliSwedishTagalogTamilTeluguThaiTurkishUkrainianUrduVietnameseWelsh

Frequently asked questions

Does Soniox translate Japanese in real time?arrow_downward
Yes. Soniox streams Japanese translation while speech is still happening, so users see or hear meaning immediately instead of waiting for the sentence to end.
What language pairs are supported for Japanese?arrow_downward
Soniox supports translation between Japanese and any of 60+ supported languages — 3,600 language pairs in total. Both Japanese as the source and Japanese as the target are supported.
How does two-way Japanese translation work?arrow_downward
Two-way translation lets both sides of a conversation speak in their own language and hear the other side in theirs. A Japanese speaker can talk in Japanese while the other party hears their own language in real time, and vice versa.
Does Soniox handle dialects and accents in Japanese?arrow_downward
Yes. Soniox handles Japanese dialects like Kanto, Kansai, and Tohoku in a single model, along with accents and language switching, so live translation stays accurate across regions and registers.
Can Soniox translate names, numbers, and domain terms in Japanese?arrow_downward
Yes. Soniox preserves the details that matter — names, phone numbers, emails, IDs, addresses, verification codes, and domain-specific terminology — in both the Japanese transcript and the translated output.
Which other providers support live Japanese translation?arrow_downward
Based on their public docs, OpenAI, Google, Azure, and Speechmatics list Japanese as a supported source language for real-time translation. Soniox is the only one of them that also supports two-way live translation across 60+ languages.
How fast is Japanese translation?arrow_downward
Soniox streams translated text as Japanese is being spoken, with ultra-low latency. Translation arrives before the sentence ends, rather than after long caption delays.
What can I build with Japanese translation?arrow_downward
Common use cases include multilingual voice agents, live interpreters, multilingual meetings, customer support and contact centers, real-time translated captions and subtitles, and accessibility and communication tools — all with Japanese as a source or target.

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