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Spanish to French speech translation API

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

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Production-ready Spanish to French translation API

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

Spanish and French both belong to the Indo-European > Romance > Western Romance family, so cognates and shared structure carry over cleanly into the translated French output.

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

A breakthrough in real-time Spanish to French translation

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Translate before the sentence ends

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

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Directional es to fr streaming

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

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High quality French output

Same model across every language, including historically underserved ones.

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Native-speaker Spanish STT accuracy

Accurate French 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": "fr"
  }
}

Spanish and French through a single stream

Spanish to French translation is built on top of Soniox Speech-to-Text API. Every spoken word is transcribed, and French 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: "fr". It runs on the same WebSocket and the same model, with no extra round trip.

Live Spanish to French: written and spoken

Spanish to French speech-to-text

micLive Spanish speecharrow_right_altsubjectFrench text

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

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

Spanish to French speech-to-speech

micLive Spanish speecharrow_right_altvolume_upSpoken French

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

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

Live Spanish to French translation in action

Stream Spanish to French one-way to push all speech into French, 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.”
translate
Translated into French in real time.

One-way translation

Translate live Spanish into French. 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
French speaker hears French.
voice_selection
French speaker replies in French.
hearing
Spanish speaker hears Spanish.

Two-way translation

Translate between Spanish and French 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 French at 5.7% 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.

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.

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About Spanish and French

Spanish has roughly 500,000,000 speakers across Spain, Mexico, Colombia, and Argentina. French has roughly 280,000,000 speakers across France, Democratic Republic of Congo, Canada, and Madagascar.

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

French was the international language of diplomacy and high culture from the 17th to the mid-20th century.

Spanish and French are closely related languages, which helps Soniox keep tone and meaning consistent across the pair.

Translate Spanish to any language

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

AfrikaansAlbanianArabicAzerbaijaniBasqueBelarusianBengaliBosnianBulgarianCatalanChineseCroatianCzechDanishDutchEnglishEstonianFinnishFrenchGalicianGermanGreekGujaratiHebrewHindiHungarianIndonesianItalianJapaneseKannadaKazakhKoreanLatvianLithuanianMacedonianMalayMalayalamMarathiNorwegianPersianPolishPortuguesePunjabiRomanianRussianSerbianSlovakSlovenianSwahiliSwedishTagalogTamilTeluguThaiTurkishUkrainianUrduVietnameseWelsh

Related translation pages

swap_horizTranslate French to Spanisharrow_right_alttranslateSpanish speech translationarrow_right_alttranslateFrench speech translationarrow_right_altarrow_right_altSpanish to Portuguesearrow_right_altarrow_right_altSpanish to Italianarrow_right_altarrow_right_altSpanish to Catalanarrow_right_alt

Frequently asked questions

How do I translate Spanish to French with the API?arrow_downward
Add a translation block to your real-time request with source_language "es" and target_language "fr". Soniox transcribes Spanish and streams the French translation over the same WebSocket.
Is Spanish to French translation real-time?arrow_downward
Yes. Soniox streams French while Spanish is still being spoken, so meaning arrives mid-sentence instead of after the sentence ends.
What about translating French to Spanish?arrow_downward
That direction is supported too. See the French to Spanish page, or use two-way translation to run both directions in one session.
Spanish and French are both Indo-European > Romance > Western Romance — does that affect quality?arrow_downward
Shared family structure and cognates generally help. Soniox uses the same model for every pair, so quality stays consistent whether the languages are closely related or not.
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 French translation stays accurate across regions.
Which other providers support Spanish to French?arrow_downward
Based on their public docs, OpenAI, Google, Azure, and Speechmatics list both Spanish and French for real-time translation. Soniox is the only one that also supports two-way live translation across 60+ languages.
How fast is Spanish to French translation?arrow_downward
Soniox streams French as Spanish is being spoken, with ultra-low latency. Translation arrives before the sentence ends.

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