Fraction calculator

Exact reduced fractions: signed ASCII integers, ≤20 digits each, denominators≠0. A/B and C/D; + − × ÷. Signs and leading zeros normalize; integers never pass through floating point.

Input and results stay in this tab's memory. No upload, browser storage, analytics, logs, URL or history data. Clear, mode change or leaving removes them. Only language/theme/consent-choice preferences may be saved.