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Live Japanese speech-to-text 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.

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Real-time Japanese translation across 60+ languages

Japanese is spoken by over 125 million people worldwide primarily in Japan, with speakers around the world. Real Japanese conversations carry accents, regional dialects, code switching, and domain-specific vocabulary. Most translation systems break on exactly that variation, or wait for a sentence to finish before producing anything usable.

Soniox handles that variation in a single model and translates Japanese as it is spoken, not after the fact. Names, numbers, addresses, IDs, and domain terms carry through into the translated transcript, and Japanese works as both a source and a target language — across its own Japonic family and any of 3,600 language pairs in total.

Real-time Japanese translation

Soniox streams the Japanese transcript and the translated text on the same connection, word by word, so meaning lands while the speaker is still talking.

Live Transcription
JapaneseTranscript

EnglishTranslation

One-way translation into Japanese

Every speaker in the room lands in a single target language. Use it for Japanese captions, subtitles, broadcasts, lectures, and multilingual meetings where many voices need to be understood in one.

YouTube

Two-way translation in Japanese

Each side speaks naturally and hears the other in their own language. Use it for live interpreters, bilingual voice agents, travel assistants, and Japanese customer support.

Live Conversation
Japanese

Turn on Japanese translation with a config change

Translation is part of the Soniox Speech-to-Text API, not a second service. Add a translation block to your request and translated tokens come back interleaved with transcripts on the same stream.

config.json
{
  "model": "stt-rt-v5",
  "translation": {
    "type": "one_way",
    "target_language": "ja"
  }
}

Translate Japanese before the sentence ends

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

Japanese paired with 60+ languages

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

Native-speaker Japanese STT accuracy

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

Japanese names, numbers, and domain terms

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

Japanese translation is built on top of the Soniox Speech-to-Text API. Turn it on by adding a translation block to your request. Translated tokens come back interleaved with transcripts on the same stream, with no extra round trip.

Explore the translation docs

Estimate your Japanese speech-to-text translation cost

Set your monthly audio volume to estimate your Soniox API cost for real-time speech-to-text translation.

Pricing calculator

Stop overpaying for Japanese speech AI

Sonioxvs

1,000 hours of audio / month

1025501002505001k2.5k5k10k100k

Pricing assumptions

Based on public pay-as-you-go pricing. Enterprise discounts and committed-use contracts may differ. Some providers charge separately for certain features. The calculator uses the public price for the provider configuration that most closely matches Soniox.

Translate Japanese to a specific language

Pick a target language for a Japanese translation API guide with config, latency, and language pair details.

AfrikaansAlbanianArabicAzerbaijaniBasqueBelarusianBengaliBosnianBulgarianCatalanChineseCroatianCzechDanishDutchEnglishEstonianFinnishFrenchGalicianGermanGreekGujaratiHebrewHindiHungarianIndonesianItalianKannadaKazakhKoreanLatvianLithuanianMacedonianMalayMalayalamMarathiNorwegianPersianPolishPortuguesePunjabiRomanianRussianSerbianSlovakSlovenianSpanishSwahiliSwedishTagalogTamilTeluguThaiTurkishUkrainianUrduVietnameseWelsh

Frequently asked questions

Does Soniox translate Japanese in real time?
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?
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?
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?
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?
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?
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?
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?
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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