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Validate Finnish Business IDs (Y-tunnus) and VAT numbers, look up companies, and autofill business forms. Runs locally. Finnish Toolkit speeds up everyday Finnish business admin. Validate a Y-tunnus (Business ID) instantly with the official checksum, convert it to a VAT number, and autofill business details into forms. • Y-tunnus validation (official PRH algorithm) • VAT-number conversion and checking • One-click business lookup and form autofill Validation runs locally and instantly. Free for validation; an upgrade unlocks live PRH company lookup and bulk checks. Made in Finland for Finnish businesses, bookkeepers, and anyone filling in company forms.