Finnish Toolkit — Y-tunnus & VAT

by Otto.Maenpaa · Tools

Manifest V3 Free

View in Chrome Web Store Data as of 16 Oct 2026

Validate Finnish Business IDs (Y-tunnus) and VAT numbers, look up companies, and autofill business forms. Runs locally.

Users

0 in 30 days

Rating

0.0 / 5

unchanged in 30 days

Ratings

0 in 30 days

Store rank

#294K

#242K among extensions

Version

0.1.0

updated 17 Jun 2026

Users

monthly, 4 months

Latest, 16 Oct 2026: 3 usersMove the mouse over the chart for any month

Ratings count

monthly, 4 months

Latest, 16 Oct 2026: 0 ratingsMove the mouse over the chart for any month

The Chrome Web Store rounds user counts down to the leading digit, so the user line moves in steps. The ratings count is exact and is the better signal of real adoption.

About Finnish Toolkit — Y-tunnus & VAT

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.