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Live English speech-to-text translation API

Translate English 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 English translation across 60+ languages

English is spoken by over 1.5 billion people worldwide across United States, United Kingdom, Canada, Australia, New Zealand, Ireland, South Africa, and beyond. Real English 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 English as it is spoken, not after the fact. Names, numbers, addresses, IDs, and domain terms carry through into the translated transcript, and English works as both a source and a target language — across its own Indo-European > Germanic > West Germanic family and any of 3,600 language pairs in total.

Real-time English translation

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

Live Transcription
EnglishTranscript

EnglishTranslation

One-way translation into English

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

YouTube

Two-way translation in English

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

Live Conversation
English

Turn on English 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": "en"
  }
}

Translate English before the sentence ends

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

English paired with 60+ languages

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

Native-speaker English STT accuracy

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

English names, numbers, and domain terms

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

English 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 English 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 English 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 English to a specific language

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

AfrikaansAlbanianArabicAzerbaijaniBasqueBelarusianBengaliBosnianBulgarianCatalanChineseCroatianCzechDanishDutchEstonianFinnishFrenchGalicianGermanGreekGujaratiHebrewHindiHungarianIndonesianItalianJapaneseKannadaKazakhKoreanLatvianLithuanianMacedonianMalayMalayalamMarathiNorwegianPersianPolishPortuguesePunjabiRomanianRussianSerbianSlovakSlovenianSpanishSwahiliSwedishTagalogTamilTeluguThaiTurkishUkrainianUrduVietnameseWelsh

Frequently asked questions

Does Soniox translate English in real time?
Yes. Soniox streams English 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 English?
Soniox supports translation between English and any of 60+ supported languages — 3,600 language pairs in total. Both English as the source and English as the target are supported.
How does two-way English translation work?
Two-way translation lets both sides of a conversation speak in their own language and hear the other side in theirs. A English speaker can talk in English while the other party hears their own language in real time, and vice versa.
Does Soniox handle dialects and accents in English?
Yes. Soniox handles English dialects like American English, British English, and Australian English 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 English?
Yes. Soniox preserves the details that matter — names, phone numbers, emails, IDs, addresses, verification codes, and domain-specific terminology — in both the English transcript and the translated output.
Which other providers support live English translation?
Based on their public docs, OpenAI, Google, Azure, and Speechmatics list English 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 English translation?
Soniox streams translated text as English is being spoken, with ultra-low latency. Translation arrives before the sentence ends, rather than after long caption delays.
What can I build with English 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 English as a source or target.

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