RUT Validator and Generator (Chile)

Validate a Chilean RUT or RUN and calculate its check digit (0–9 or K), and generate valid RUTs for testing. Free and in your browser, nothing is sent.

Generate test numbers
Generated numbers are fictitious and only for testing software and forms. Using them to pass yourself off as someone, open accounts or register anything is illegal.
What it does
The RUT (Rol Único Tributario) is the Chilean tax number, the same as the RUN for individuals. It is written as 12.345.678-5: a number followed by a check digit that can be 0 to 9 or K. The digit is calculated by multiplying the digits from right to left by 2, 3, 4, 5, 6, 7, 2, 3… and taking 11 minus the remainder of the sum divided by 11; 11 becomes 0 and 10 becomes K.
Everything happens in your browser: the numbers you type are not sent or stored.
Frequently asked questions
Does a valid number mean that the person or company exists?
No. It only means the check digits are correct, which catches typing mistakes. Whether the number was actually issued, and to whom, can only be checked with the authority that issues it.
What are the generated numbers for?
For testing: filling in forms in development, testing databases and validation code. They are made at random with correct check digits, so by chance one may coincide with a real number. Never use them to identify yourself, sign up for anything or deceive anyone.
How does a check digit work?
It is calculated from the other digits with a fixed formula, usually multiplying each digit by a weight and taking the remainder of a division (modulo 11, or modulo 23 for the Spanish DNI letter). If one digit is typed wrong or two are swapped, the check digit no longer matches.
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