Live English speech translation API

Production-ready English speech translation API

Real conversations in English 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.

English belongs to the Indo-European > Germanic > West Germanic family. Soniox translates between English and related languages, as well as any of 60+ supported targets and 3,600 language pairs in total.

A breakthrough in real-time English translation

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.

High quality English output

Same model across every language, including historically underserved ones.

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.

Live English translation: written and spoken

Live Transcription

SpanishTranscript

EnglishTranslation

English speech-to-text translation

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

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

Realtime Translator

HarutoJapanese

Speaking

EmmaEnglish

English speech-to-speech translation

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

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

One-way or two-way English translation

One-way translates all speech into a single target language. Two-way keeps a bilingual conversation flowing between English and another language, so each side speaks naturally and hears the other in their own.

YouTube

One-way translation

Translate live speech to or from English 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.

More about one-way translation

Live Conversation

Sofía

Two-way translation

Translate between English 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.

More about two-way translation

Translate English to a specific language

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

Frequently asked questions