About Kurashi Tools
About Kurashi Tools and the principles behind its free Japanese document helpers.
What we make
Kurashi Tools provides small utilities for date labels, ages and other information that is easy to misread on Japanese paperwork. The English section is written for foreign residents, international students, parents and workers who need a clear result without creating an account.
How the tools operate
Calculations run in your browser. The service does not require a runtime account database or send the dates you enter to a calculation server. Explanations show the assumptions and boundaries that matter, including Japanese era transition dates.
Accuracy and responsibility
Results are intended as practical reference material. Government offices, schools, employers and other organizations may apply their own forms and cutoff rules. Always follow the issuer's current instructions and compare important dates with original records.