This page is designed to help you find out whether DataMockSeed.firstflip.es is good and if it is the right choice for you.
DataMockSeed is a free, no-signup web tool for generating fake data with correct checksums and control digits: Spanish DNI, NIE, CIF, IBAN (ES/DE/FR/PT with real bank/BIC codes), sandbox credit cards (Luhn algorithm, safe test BIN ranges), phone numbers, and full identities. Unlike asking an LLM, every value is deterministic via a seed and always passes its own validator — useful for QA, automated tests, and database seeding. Everything generates client-side in the browser; nothing is sent to a server.
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Spanish ID generation
Generates DNI, NIE, CIF, NIF and NSS with real control-digit/checksum algorithms, not just random numbers.
Multi-country IBAN
Generates IBAN for Spain, Germany, France and Portugal, with a matching real bank name and BIC/SWIFT code.
Sandbox credit cards
Generates Visa, Mastercard and Amex numbers with a valid Luhn checksum, using safe test BIN ranges only.
Spanish phone numbers
Generates mobile and landline numbers using real Spanish carrier prefixes and provincial codes.
Consistent fake identities
Generates a full identity — name, address, postal code and province — kept coherent with each other.
Built-in validator
Checks whether a DNI, NIE, CIF, IBAN, card, NSS or CCC you paste in has a valid format and control digit.
Deterministic Seeds
The same seed and schema always produce the exact same dataset, so tests stay reproducible in CI/CD.
Schema Builder
Compose a multi-column dataset in the Playground and generate up to 10,000 rows at once.
Multiple export formats
Export any generated dataset as JSON, CSV, SQL INSERT statements, or plain text.
Public REST API
A documented REST API with rate limits and ready-to-use code snippets for automated testing.
No signup, runs in the browser
All generation happens client-side, with no account required; installable as a PWA.
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General fakers like Faker.js don't implement Spanish document formats at all, and asking an LLM for a "fake DNI" reliably produces a wrong check digit and a different answer every time. DataMockSeed is free, requires no signup, is reproducible via seed for CI, and ships a validator so you can double-check any value — generated by it or pasted from elsewhere — without sending it to a server.
It generates Spanish identity and banking documents — DNI, NIE, CIF, NSS, IBAN, CCC — with the real control-digit/checksum algorithm behind each one, not just random-looking numbers. Generation is seed-based (same seed + schema = same dataset, always) and runs entirely in the browser, and the same codebase that generates a value also validates it, so the two never drift apart.
QA engineers and manual testers who need realistic Spanish test data, and backend/full-stack developers seeding databases or writing automated tests (via the public REST API) for apps that validate DNI, IBAN or card numbers. Also freelancers and agencies building demos, and anyone learning how these checksum algorithms actually work.
It started from a recurring problem in QA and development work in Spain: test data either used real personal data (a compliance risk), or came from generic tools that don't produce a valid DNI/NIE/CIF/IBAN, breaking any form or API that validates them. DataMockSeed was built to close that gap — deterministic, spec-correct, browser-only generation — and is growing in public, phase by phase (generators first, then an API and docs, now SEO landings per data type).
Next.js (App Router) and TypeScript on Vercel, Tailwind CSS v4 for the UI, a custom seeded PRNG (no Math.random() in any generator, for reproducibility), Vitest for unit tests and Playwright for end-to-end tests, and GitHub Actions for CI/CD.
There isn't a customer list to share — it's a free tool with no sign-up or accounts (yet), so nobody logs in and no usage is tied to a company or name. It's used anonymously by QA teams and developers, either through the web app or the public API in their own test suites.
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