haz.tools ares

Builder of haz.tools, a directory of 100+ free Spanish online tools.

I build calculators, validators, and generators that respect privacy: every tool runs entirely in your browser, no signup required, no data sent to a server.

The directory covers Spanish/Iberoamerican tax calculators (autónomos 2026, hipoteca, IRPF), document validators (DNI, NIE, CIF, IBAN, RFC, RUT, RUC, NIT, CUIT), generators (passwords, UUID, QR, hashes), and more.

Why I built it: most online calculators apply US/UK legislation, require signup, or have invasive ads. I wanted a directory that treats users with respect.

Most popular tools:
- Mortgage calculator with French amortization
- Self-employed tax 2026 (RDL 16/2025 brackets)
- DNI/NIE/CIF validator
- IBAN validator (módulo 97)
- Password generator (crypto.getRandomValues)

Visit: https://haz.tools/?utm_source=aboutme&utm_medium=perfil&utm_campaign=backlinks2026
Blog: https://haz.tools/blog
Contact: [email protected]

Madrid, España.