Free tool · Shopify · EU
Invoice numbering gap checker
Paste your invoice numbers below. In the EU an invoice series must be sequential with no gaps — this instantly finds any missing numbers, duplicates or breaks. Everything stays in your browser.
A clean result only covers the numbers you pasted — a fully compliant series must also start correctly and stay gapless across the whole period.
Why numbering with no gaps matters
In the EU an invoice series must be sequential and gapless: a missing or duplicated number is a red flag in a tax audit, because it suggests an invoice was deleted or issued off the books. Gaps usually creep in when invoices are made by hand or across disconnected tools.
With Tarvela a gap can never happen — every paid Shopify order gets the next legal number, gapless and immutable, automatically.
Install free on Shopify See how it worksGeneral information about EU invoicing, not tax advice. Your numbers are analysed in your browser and never sent anywhere.