English to Japanese Translation
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Translate English to Japanese instantly with AI. Free, accurate and private — no sign-up needed.
Everything in one place
Built for every kind of translation
From a single word to a 200-page contract — the same engine, tuned for context, tone and domain.
Context-aware AI
Understands idioms, named entities and sentence context — not word-by-word substitution.
Voice & speech
Speak to translate, and hear results read aloud with natural text-to-speech.
Image & OCR
Snap a menu, sign or screenshot — text is detected and translated in place.
Documents
PDF, DOCX, PPTX and XLSX with formatting preserved.
Domain modes
Legal, medical, technical and marketing modes for terminology accuracy.
Writing tools
Grammar checking, paraphrasing, summarising and tone adjustment built in.
Website translation
Paste a URL and read any page in your language.
Developer API
REST API with keys, rate limits and usage dashboards for your own apps.
Files & documents
Translate whole documents
Drop a file below. Layout, tables and images stay exactly where they were — only the language changes.
Up to 50 MB per file
Write better in any language
Writing tools
Learn while you translate
Language learning, built in
Dictionary & examples
Definitions, synonyms, antonyms and real example sentences for every lookup.
Phrasebooks
Travel, business and everyday phrase collections with pronunciation guides.
Daily quizzes
Short vocabulary and grammar quizzes generated from what you translate.
Grammar guides
Clear explanations of tenses, cases and word order for 40+ languages.
Pronunciation
Hear native-quality audio and slow-mode playback for tricky words.
From the blog
Guides & language tips
20 Spanish Phrases Every Traveller Should Know
From ordering coffee to asking for directions — the phrases that carry you through a trip to any Spanish-speaking countr...
GrammarSer vs Estar: The Clearest Explanation You Will Read
Spanish has two verbs for "to be". Here is the mental model that finally makes the difference stick.
Translation TipsHow to Get Better Results From Machine Translation
AI translation is only as good as what you feed it. Six habits that dramatically improve output quality.
For developers
One API call to any language
A clean REST API with predictable JSON, per-key rate limits and a live usage dashboard. Free tier included.
- POST /v1/translate — text & batch translation
- POST /v1/detect — language detection
- POST /v1/documents — async document jobs
- GET /v1/languages — all supported languages
- API keys, rate limiting & usage analytics
# Translate text with one request curl https://engtospan.com/api/v1/translate \ -H "Authorization: Bearer YOUR_API_KEY" \ -H "Content-Type: application/json" \ -d '{ "q": "Good morning, friend!", "source": "auto", "target": "es", "tone": "informal" }' # Response { "translation": "¡Buenos días, amigo!", "detected_source": "en", "characters": 20, "latency_ms": 212 }
Questions
Frequently asked
Is EngtoSpan free to use?
Yes. Text, voice, image and document translation are completely free with no account required. The developer API has a generous free tier, with paid plans for higher volume.
Do I need to create an account?
No. Every translation tool on the site works without registration. Your translation history is kept only in your browser for the current session.
Which languages are supported?
Over 200 languages, including all major world languages plus many regional and low-resource languages. Use auto-detect if you are unsure of the source language.
Is my text stored anywhere?
No. Text is processed to produce your translation and is never stored on our servers. Uploaded files are deleted automatically within 24 hours.
How accurate are the translations?
The engine uses context-aware AI models with domain modes for legal, medical and technical terminology. For critical documents we still recommend a professional human review.
Can I translate PDF and Word documents?
Yes. Upload PDF, DOCX, PPTX, XLSX, TXT or SRT files and the translated document is returned with its formatting preserved.