Translate Spoken English into Japanese with Speech-to-Speech AI

Upload any English audio file or record directly, and TransWord.AI transcribes the speech and translates it into Japanese. Each file is automatically split into clear segments, so you can jump straight to the moment that matters — replay clips in Segment View, polish the transcript, or download individual portions alongside the complete translation. An Add time stamp checkbox lets you decide whether copied or exported text keeps the exact timestamps for every line.

Example audio sources:

• Business meetings → Convert spoken English discussions into Japanese.
• Podcast episodes → Make your content multilingual for a global audience.
• Recorded customer service calls → Translate past conversations to improve future communication.
• Educational lectures → Help students understand complex topics in their native language.
• Travelers → Instantly produce Japanese audio to communicate with locals.

How to Translate English Audio to Japanese in Two Simple Steps

1. Add your audio — upload an MP3 or WAV, paste a file, or record directly from your microphone.
2. Get your translation — the Japanese appears automatically, split into segments, ready to copy, download, or hear back in a lifelike AI voice.

That's the whole workflow. Everything below is for when you want more control than any free audio translator gives you.

Try it now ↑

Target Audience

• Children: Simplified and easy-to-understand language.
• General: Suitable for everyday use.
• Professional: For formal or serious communication.

Special Instructions

When translating audio from English to Japanese, you can refine politeness level, script style, and structure to match your audience and context.

Politeness Level

Japanese uses different levels of politeness that significantly affect verb endings and sentence structure.

You may specify in this way:

• Use casual form (plain style)
• Maintain polite form (です / ます style)
• Translate in formal business Japanese
• Use honorific / respectful language (敬語)

Name & Script Handling

You may guide how names and foreign terms should appear:

• Write foreign names in Katakana
• Preserve original English spelling in brackets
• Use Kanji where appropriate
• Prefer Kana-heavy writing for easier readability

Vocabulary Preference

You may guide lexical choices:

• Prefer native Japanese vocabulary
• Allow common loanwords (カタカナ語)
• Avoid overly literal translation
• Use simplified everyday wording

Sentence Structure Preference

English often uses long or complex sentence structures.

You may specify:

• Break long English sentences into shorter Japanese sentences
• Simplify complex clauses
• Preserve original structure closely

Clear English speech — rendered into natural, context-appropriate Japanese text.

Advanced Features

• Avoid Repetition: Eliminate redundant phrases.
• Use Synonyms: Introduce variety in phrasing.
• Multiple Alternatives: Generate several versions of a translation for comparison.

Work Segment by Segment — Transcribe, Review & Speech-to-Speech

Transcribe for source-language notes

Press Transcribe Audio whenever you need a text-only transcript in English — perfect for meeting notes, compliance reviews, or quick captioning before you finalize a translation. The transcript mirrors Segment View, so every clip keeps its timestamps and can be downloaded individually or as a whole, without generating Japanese audio.

Just want speech turned into text, with no translation at all? Open the English Audio-to-Text (Transcription) tool to get a clean English transcript on its own.

Review each segment

• Open the segment timeline to replay clips, refine the transcript, or flag sections for teammates.
• Download any individual segment or export the entire conversation at once.
• Toggle the Add time stamp checkbox to include or remove timestamps when copying, downloading or sharing.

Speech-to-Speech

Tick the Speech-to-Speech box to hear the translation spoken back in Japanese — a more interactive way to review and share.

Polish Your Translation with Improve & Summarize

A good result can still be tightened. Improve rephrases the translated transcript for clarity, tone and fluency without changing its meaning.

Summarize condenses long recordings — a lecture or a two-hour meeting — into key points. And Auto Format rebuilds the output's structure — headings, lists, tables — in one click, without touching the meaning.

What Can You Translate with Each Plan?

🟢 Smart – Perfect for Getting Started

Ideal for trying TransWord.AI on real recordings — short clips, voice notes and quick calls with 20 audio/video minutes every month.

🔵 Global – Built for Professional Work

Translate interviews, podcasts and meetings with 40 audio/video minutes every month — ideal for ongoing professional use.

🟣 Premium – Ready for Larger Projects

For regular podcasts, lecture series and long recordings, 90 audio/video minutes every month keep you moving.

🟠 Business – Maximum Capacity

Back-catalogues, continuous transcription and high-volume audio workloads — 150 audio/video minutes every month, built for your most demanding projects.

Compare all plans ↑

Explore the English to Japanese AI Dictionary

Open the English to Japanese AI Dictionary to explore English to Japanese vocabulary instantly.