Free Tools
Handy, privacy-friendly utilities for developers and testers. Every tool runs entirely in your browser — nothing you enter is sent to a server.
These free developer tools validate the format and checksums of common identifiers — credit card numbers (Luhn/mod-10), IBANs (ISO 13616 mod-97), US routing numbers (position-weighted), SSN, SIN, NINO and VIN — and generate safe test values you can drop straight into forms and databases. Every tool runs entirely in your browser, so nothing you type is ever sent to a server. They pair with the identity generators on this site: generate a value, paste it into the matching validator, and confirm it is structurally correct.
Which free tool should you use?
| Task | Tool | Checks |
|---|---|---|
| Validate a card number | Credit Card Validator | Luhn checksum and card scheme |
| Generate or validate US SSNs | SSN Generator & Validator | US SSN structure and reserved test ranges |
| Validate bank account numbers | IBAN Validator | ISO 13616 / mod-97 checksum |
| Validate US routing numbers | ABA Routing Number Validator | 9-digit routing checksum |
| Create credentials | Password Generator | Web Crypto random passwords |
Each tool is built for one validation or generation job and runs locally in your browser.
Credit Card Validator
Check a card number with the Luhn algorithm.
SSN Generator & Validator
Generate safe test SSNs and validate US SSN format.
Canadian SIN Generator & Validator
Generate safe test SINs and validate the Luhn checksum.
UK NINO Generator & Validator
Generate safe test NINOs and validate the format.
VIN Validator
Validate a 17-char VIN check digit (ISO 3779).
IBAN Validator
Validate an IBAN with the mod-97 check.
ABA Routing Number Validator
Validate a US bank routing number checksum.
Password Generator
Generate strong random passwords in your browser.
QR Code Generator
Turn any text or URL into a QR code.
What these tools do
Each utility falls into one of two jobs. Validators check whether an identifier is well-formed by recomputing the checksum baked into it — the Luhn mod-10 digit on a card, the mod-97 remainder on an IBAN, the position-weighted sum on a US ABA routing number, or the transliteration-based check digit on a VIN. They tell you a number is structurally correct, not that it is real, active, or linked to an account. That distinction is exactly why they are safe for testing payment, banking, and onboarding forms without ever touching live data.
Generators do the inverse: they produce believable values that pass the same checks but can never collide with a real person or account. Test SSNs use the 900–999 area range the Social Security Administration has never issued; test card numbers carry a valid Luhn digit on sandbox BINs, so they validate as the right scheme yet are non-chargeable. The password generator and QR code generator round out the set for everyday dev and QA work.
The validators here use the same checksum code as the identity generators on this site, so anything the site generates is guaranteed to pass the matching tool. Generate a card, SSN, IBAN, or routing number on a generator page, paste it into its validator here, and you have a closed loop for building and testing form logic.
Privacy: validation runs in your browser
Validation and generation run client-side, as JavaScript on the page — your input is not submitted to our servers, logged, or stored. You can confirm it yourself: open your browser's network tab and run any tool, and you will see no request fire when you check or generate a value. (The page itself is served like any website; it is the tool logic that stays on your device.)
That client-side design means it is safe to paste test card numbers, account identifiers, or generated SSNs without worrying about where they go. Once the page has loaded, validating and generating values needs no further server round-trip, so the tools stay fast and keep your test inputs on your machine.
Frequently asked questions
Are these tools free to use?+
Yes, all of them are completely free with no sign-up, account, or usage limit. They are funded by ads on the page, so there is nothing to pay and no feature locked behind a wall.
Is my input sent to a server?+
No. Every tool runs entirely in your browser using JavaScript — your card number, account number, SSN, or any other input never leaves your device and is never stored. You can verify this in your browser's network tab: no request is made when you validate or generate a value.
What is the difference between a validator and a generator?+
A validator takes a value you already have and recomputes its checksum to tell you whether it is structurally well-formed (for example, whether a card passes the Luhn check). A generator does the reverse: it creates a new value that passes those same checks but is safe for testing and cannot belong to a real person or account.
Do generated test values pass the validators?+
Yes. The generators and validators share the same checksum code, so any card number, SSN, IBAN, or routing number produced on this site will pass its matching validator here. That lets you build a generate-then-validate loop when testing form logic.
Are these tools safe to use with test data?+
Yes, that is exactly what they are built for. Generated values use never-issued ranges and sandbox identifiers — never-issued SSN areas, non-chargeable test card BINs — so they validate correctly while staying fictional. All output is for testing and development only and should never be presented as a real identity.