Local
Taiwan ID numbers, invoice codes, year systems — quick checks for daily life.
All 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between Taiwan ROC (民國) and Gregorian years instantly in either direction — for tax forms, government paperwork, and historical documents.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.
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.
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.
Related categories
Frequently Asked Questions
What local tools are available?
Taiwan-focused tools including ID validators, invoice code checkers, ROC-Gregorian date converters, and year system converters.
Are local tools bilingual?
Yes. Most local tools support both English and Traditional Chinese interfaces. Use the language toggle to switch.
How accurate are the validators?
Validators check format rules and check digits according to official specifications. They verify format correctness, not whether an ID or invoice actually exists.