Chile RUT Validator
Check a Chilean RUT or RUN with the official modulo-11 check digit and see it neatly formatted. 100% local — your number is never uploaded. Built for Chile.
Batch check — paste many, one per line
Validate a Chilean RUT
Paste a RUT (dots and hyphen optional) to check its modulo-11 check digit, see segmented body/verificador, and batch-check lists — all locally.
Chile's RUT (Rol Único Tributario) consists of a number of up to 8 digits plus a verification digit (DV) that can be 0–9 or the letter K. The DV comes from ISO-style modulo 11: multiply the digits from right to left by the repeating weights 2,3,4,5,6,7, sum, and compute 11 − (sum mod 11); 11 maps to 0 and 10 maps to K. The registry authority is Servicio de Impuestos Internos (SII). This tool cleans the input (dots and dash optional), recomputes the DV, and shows the standard format.
Validation is purely mathematical and local — for whether a RUT is actually assigned, active, or matches a business name, use SII's official services. Last verified: July 2026.
FAQ
Why can the check "digit" be a K?
The mod-11 formula produces values 1–11: 11 is written as 0 and 10 has no single digit, so the standard writes it as K. Roughly one in eleven valid RUTs ends in K — it is normal, not an error.
Do dots and the dash matter?
No — 12.345.678-5, 12345678-5 and 123456785 are the same RUT. The tool strips formatting before checking and re-prints the canonical dotted form for you to copy.
Is RUT the same as RUN?
Same number, different context: RUN is the national identity number on the ID card; RUT is its use as a tax ID. Companies get RUTs starting at 50.000.000 and above, which never correspond to a person’s RUN.
Can I validate a customer file in bulk?
Yes — batch mode accepts one RUT per line with or without formatting, returns per-row verdicts with the expected DV when wrong, and exports CSV. Nothing leaves your browser.