Local / Calendar
ROC / Gregorian Year Converter
Convert between ROC and Gregorian years instantly.
Local / Browse
Local Tools
Taiwan ID numbers, invoice codes, year systems — quick checks for daily life.
Browse Local Tools
Handy if you live or work in Taiwan and need a quick format conversion or validation.
Local / Taiwan
Taiwan ID Validator
Check Taiwan national ID format, checksum, and prefix.
Local / Calendar
Year System Converter
Cross-reference Gregorian, ROC, Japanese era, and Buddhist years.
Local / Taiwan
Uniform Invoice Validator
Validate a Taiwan business number format and checksum.
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.