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Taiwan ID numbers, invoice codes, year systems — quick checks for daily life.
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LOCAL
ROC / Gregorian Year Converter
Convert between Taiwan ROC (民國) and Gregorian years instantly in either direction — for tax forms, government paperwork, and historical documents. Runs locally.
Local
LOCAL
Uniform Invoice Validator
Validate an 8-digit Taiwan business number (統一編號 / 統編) checksum locally, using the post-2023 Ministry of Finance rule. For accounting and e-invoice work. Nothing is uploaded.
Local
LOCAL
Year System Converter
Cross-reference Gregorian, ROC, Japanese era (Meiji–Reiwa), and Buddhist years — convert Reiwa, Heisei, or Showa to Western years instantly. Runs locally.
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