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Spanish to Vietnamese speech translation API

Stream Spanish (Español) speech and get Vietnamese (Tiếng Việt) back in real time. One WebSocket, ISO codes es to vi, and ultra-low latency for voice agents and live apps.

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Production-ready Spanish to Vietnamese translation API

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

Spanish (Indo-European > Romance > Western Romance) and Vietnamese (Austroasiatic > Vietic) come from different language families, so word order and morphology differ. Soniox reorders meaning in-stream instead of word by word.

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

A breakthrough in real-time Spanish to Vietnamese translation

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Translate before the sentence ends

Vietnamese meaning lands as Spanish is spoken, not after the caption catches up.

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Directional es to vi streaming

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

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High quality Vietnamese output

Same model across every language, including historically underserved ones.

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Native-speaker Spanish STT accuracy

Accurate Vietnamese translation starts with accurate Spanish 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": "es",
    "target_language": "vi"
  }
}

Spanish and Vietnamese through a single stream

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

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

Live Spanish to Vietnamese: written and spoken

Spanish to Vietnamese speech-to-text

micLive Spanish speecharrow_right_altsubjectVietnamese text

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

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

Spanish to Vietnamese speech-to-speech

micLive Spanish speecharrow_right_altvolume_upSpoken Vietnamese

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

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

Live Spanish to Vietnamese translation in action

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

voice_selection
Spanish speaker says: “Necesito tu feedback sobre la ruta a la sierra.”
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Translated into Vietnamese in real time.

One-way translation

Translate live Spanish into Vietnamese. Everyone in the conversation sees the same translated stream.

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

voice_selection
Spanish speaker talks in Spanish.
hearing
Vietnamese speaker hears Vietnamese.
voice_selection
Vietnamese speaker replies in Vietnamese.
hearing
Spanish speaker hears Spanish.

Two-way translation

Translate between Spanish and Vietnamese 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 Spanish at 5.3% word error rate and Vietnamese at 5.4% 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.

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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 Spanish and Vietnamese

Spanish has roughly 500,000,000 speakers across Spain, Mexico, Colombia, and Argentina. Vietnamese has roughly 95,000,000 speakers across Vietnam.

Spanish is the second most spoken language in the world by native speakers, after Mandarin Chinese.

Vietnamese was historically written in Chinese characters (Chữ Hán) and a modified form called Chữ Nôm.

Soniox makes Spanish to Vietnamese usable in real-time translation across every supported pair.

Translate Spanish to any language

From Spanish to Vietnamese, or Spanish to any of 60+ supported languages. All real-time.

AfrikaansAlbanianArabicAzerbaijaniBasqueBelarusianBengaliBosnianBulgarianCatalanChineseCroatianCzechDanishDutchEnglishEstonianFinnishFrenchGalicianGermanGreekGujaratiHebrewHindiHungarianIndonesianItalianJapaneseKannadaKazakhKoreanLatvianLithuanianMacedonianMalayMalayalamMarathiNorwegianPersianPolishPortuguesePunjabiRomanianRussianSerbianSlovakSlovenianSwahiliSwedishTagalogTamilTeluguThaiTurkishUkrainianUrduVietnameseWelsh

Related translation pages

swap_horizTranslate Vietnamese to Spanisharrow_right_alttranslateSpanish speech translationarrow_right_alttranslateVietnamese speech translationarrow_right_altarrow_right_altSpanish to Portuguesearrow_right_altarrow_right_altSpanish to Frencharrow_right_altarrow_right_altSpanish to Italianarrow_right_alt

Frequently asked questions

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

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