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French to Spanish speech translation API

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

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Production-ready French to Spanish translation API

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

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

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

A breakthrough in real-time French to Spanish translation

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Translate before the sentence ends

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

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Directional fr to es streaming

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

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High quality Spanish output

Same model across every language, including historically underserved ones.

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Native-speaker French STT accuracy

Accurate Spanish translation starts with accurate French 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": "fr",
    "target_language": "es"
  }
}

French and Spanish through a single stream

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

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

Live French to Spanish: written and spoken

French to Spanish speech-to-text

micLive French speecharrow_right_altsubjectSpanish text

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

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

French to Spanish speech-to-speech

micLive French speecharrow_right_altvolume_upSpoken Spanish

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

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

Live French to Spanish translation in action

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

voice_selection
French speaker says: “Tu bosses remote demain ou tu viens au bureau pour le big meeting?”
translate
Translated into Spanish in real time.

One-way translation

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

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

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

Two-way translation

Translate between French and Spanish 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 French at 5.7% word error rate and Spanish at 5.3% 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 French and Spanish

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

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

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

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

Translate French to any language

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

AfrikaansAlbanianArabicAzerbaijaniBasqueBelarusianBengaliBosnianBulgarianCatalanChineseCroatianCzechDanishDutchEnglishEstonianFinnishGalicianGermanGreekGujaratiHebrewHindiHungarianIndonesianItalianJapaneseKannadaKazakhKoreanLatvianLithuanianMacedonianMalayMalayalamMarathiNorwegianPersianPolishPortuguesePunjabiRomanianRussianSerbianSlovakSlovenianSpanishSwahiliSwedishTagalogTamilTeluguThaiTurkishUkrainianUrduVietnameseWelsh

Related translation pages

swap_horizTranslate Spanish to Frencharrow_right_alttranslateFrench speech translationarrow_right_alttranslateSpanish speech translationarrow_right_altarrow_right_altFrench to Italianarrow_right_altarrow_right_altFrench to Portuguesearrow_right_altarrow_right_altFrench to Catalanarrow_right_alt

Frequently asked questions

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

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