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Password Strength Checker
Estimates password entropy and crack time, and identifies the specific weaknesses in what you…
Canadian SIN Validator
Checks a Canadian Social Insurance Number with the Luhn algorithm and flags the temporary-resident series.
Security
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Free, unlimited
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In short
A Canadian SIN is nine digits validated by the Luhn algorithm — the same mod-10 doubling rule used on payment cards and IMEI numbers, which is why a card validator will happily accept a SIN and vice versa. Luhn catches every single-digit error but not every transposition: swapping an adjacent 0 and 9 leaves the total unchanged, which is a known limitation of the scheme rather than of any implementation. The first digit indicates the issuing region, and a leading 9 marks a number issued to a temporary resident, which expires — so a 9-series SIN that passes the checksum may still no longer be usable. Only Service Canada can confirm a SIN is valid and current.
How to use the Canadian SIN Validator
- Paste the number — punctuation and spaces are ignored.
- Read the verdict and, where the number encodes anything, what it decodes to.
- Treat a pass as "typed correctly", not as "confirmed by the authority".
About the Canadian SIN Validator
A Canadian SIN is nine digits validated by the Luhn algorithm — the same mod-10 doubling rule used on payment cards and IMEI numbers, which is why a card validator will happily accept a SIN and vice versa. Luhn catches every single-digit error but not every transposition: swapping an adjacent 0 and 9 leaves the total unchanged, which is a known limitation of the scheme rather than of any implementation. The first digit indicates the issuing region, and a leading 9 marks a number issued to a temporary resident, which expires — so a 9-series SIN that passes the checksum may still no longer be usable. Only Service Canada can confirm a SIN is valid and current.
What people use it for
- Catching a mistyped number in a form before it reaches a database.
- Cleaning an imported list and finding the rows that cannot be right.
- Understanding what the number encodes and what it does not.
Details
| Algorithm | Luhn — the same mod-10 rule as payment cards and IMEIs |
|---|---|
| Typo detection | 100% of single-digit errors; Luhn misses a 0/9 adjacent swap |
| Leading 9 | Issued to temporary residents, and it expires |
| Length | Nine digits, usually written 123-456-789 |
| Privacy | Checked locally; never transmitted |
The leading-9 case is the clearest example on this site of why a checksum is not a validity check: the arithmetic cannot express an expiry date. Nothing you paste is transmitted — the check runs entirely in your browser.
Where this tool stops
Internal consistency only. It cannot confirm the SIN was issued, is active, or has not expired.
Frequently asked questions
Is a SIN checked the same way as a credit card?
Yes — both use Luhn. That is why a generic Luhn checker validates both, and why a card-number field will sometimes accept a SIN. The algorithms are identical; only the length and context differ.
What does a SIN starting with 9 mean?
It was issued to a temporary resident and carries an expiry date. The checksum has no expiry, so a 9-series number can pass this check long after it stopped being usable — a case where a green tick is genuinely not enough.
Which errors does Luhn miss?
Adjacent transpositions of 0 and 9. Swapping them leaves the doubled-and-reduced total unchanged, so the check still passes. Every single-digit error is caught.
Is anything I paste sent anywhere?
No. The arithmetic runs in this browser tab and no request is made — open your Network tab and watch while you type. That matters more for an identity number than for almost anything else on this site, which is why there is no server side to this tool at all.
Does this replace an official check?
No, and it cannot. Every scheme here proves at most that the digits are internally consistent. Only the issuing authority can confirm a number exists, is active, and belongs to a particular person.
Is the Canadian SIN Validator free, or is there a paid tier?
Free, unlimited, and no email address required. You can use it a hundred times a day and nothing changes.
Is what I paste into the Canadian SIN Validator stored?
No. The Canadian SIN Validator runs entirely in your browser using JavaScript. Because the work happens locally, the tool also keeps working if your connection drops, and closing the tab is all it takes to discard everything.
What do people use the Canadian SIN Validator for most?
The jobs it is built for: catching a mistyped number in a form before it reaches a database. Cleaning an imported list and finding the rows that cannot be right. Understanding what the number encodes and what it does not. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
Is there anything the Canadian SIN Validator cannot do?
Internal consistency only. It cannot confirm the SIN was issued, is active, or has not expired. Knowing where a tool stops being trustworthy matters more than the cases where it works.
What figures does the Canadian SIN Validator work from?
Algorithm is Luhn — the same mod-10 rule as payment cards and IMEIs. Typo detection is 100% of single-digit errors; Luhn misses a 0/9 adjacent swap. Leading 9 is Issued to temporary residents, and it expires. These are printed on the page itself, so you do not have to take them on trust.
Will this work on a tablet?
Yes. The page is responsive and the tool works in Chrome, Safari, Firefox, Edge and Samsung Internet on both Android and iOS. There is no app to install and nothing to sign into.
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