Is your Japanese copy quietly failing?

Paste your Japanese web copy — or your ja.json — and get an instant report of machine-translation artifacts, style inconsistencies, and broken placeholders. The same first-pass checks we run in a professional audit.

100% client-side. Your text never leaves this page — nothing is uploaded or stored.

What this tool catches

Passive-voice subject errors — the classic MT pattern
Polite / plain style mixing (です・ます vs だ・である)
Half-width katakana & stray spaces inside Japanese text
ASCII periods ending Japanese sentences
Broken or missing placeholders ({name}, %s, {{var}})
Untranslated strings & missing keys (with en.json)

These are the mechanical fingerprints of unreviewed machine translation.

What no tool can catch

Whether your tone matches Japanese B2B expectations
Keigo (politeness register) appropriate to your buyer
Terms your Japanese competitors actually use
Copy that is grammatical — but sounds like no one's company

That judgment layer is exactly what a native QA review adds. See how we work →