Free Online Validators
This validators collection groups related Fneno utilities so you can find the right tool fast. Everything runs in the browser with a free-first experience.
⭐ Featured tools
All tools in this collection
CSS Minifier
Minify stylesheets for production
CURP & RFC Validator (Mexico)
Validate Mexican CURP and RFC (persona física) format and checksum
Email Validator
Syntax check + optional MX lookup
HTML Formatter
Format and minify HTML markup in the browser
HTML Minifier
Compress HTML markup
IBAN Validator & Formatter
Validate GCC and international IBANs
ISBN Validator
Validate ISBN-10 and ISBN-13 check digits
JavaScript Minifier & Beautifier
Minify or pretty-print JS in browser
JWKS JSON Validator
Validate JWK Set JSON for OIDC providers
NIF & CIF Validator (Spain)
Validate Spanish NIF, NIE, DNI and CIF tax IDs — checksum in your browser
NPWP Validator (Indonesia)
Validate Indonesian NPWP & NIK — Luhn checksum, KPP, birth date decode
PAN Card Validator
Free online PAN Card Validator — fast, private browser tool on Fneno.com.
PWA Manifest Generator
Progressive Web App manifest.json builder
RIB Validator FR
Free online RIB Validator FR — fast, private browser tool on Fneno.com.
Saudi National ID Validator
Validate Saudi ID / Iqama number checksum
Saudi WPS File Validator
Validate WPS salary file CSV structure
SWIFT / BIC Validator
Validate bank SWIFT/BIC codes
T.C. Kimlik Validator (Turkey)
Validate Turkish national ID (T.C. Kimlik No) checksum — 11 digits
VAT Invoice Validator China
Free online VAT Invoice Validator China — fast, private browser tool on Fneno.com.
XML Formatter
Format, validate, and minify XML documents
YAML ↔ JSON Converter
Convert between YAML and JSON both ways
JSON Formatter
Format, validate and beautify JSON instantly
Regex Tester
Test regular expressions with live match highlighting
About this collection
❓ Frequently Asked Questions
They are free browser tools matched to the validators intent — open any card below to start.
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