Engine-backed + smart casualizer. Drop-in single file.
Enter English
Translation engine (recommended for "anything")
Choose one engine. If none is configured, the app falls back to an
offline rule-based translator.
We send a short instruction so the engine returns casual
Japanese directly. Your key stays in your browser.
If the engine returns polite forms, we run a "casualizer" pass
to de-formalize.
Casual Japanese
…
How it translates "anything"
Engine step (optional but recommended): Send your
English to a general MT engine with instructions to produce casual
Japanese directly.
Casualizer step: A post-processor that removes
です／ます, converts common polite conjugations to plain, drops
obvious subjects, and adds conversational particles.
Fallback: If no engine is configured or it fails,
we use an offline rule-based translator so you still get something.
Note: Keep your API keys private. Everything runs client-side in your
browser.