Overview
Auto-detect invoice registration numbers on any web page and verify via NTA API in real-time. Japan Invoice System (適格請求書) tool.
**Invoice Checker — Instantly Verify Japanese Invoice Registration Numbers** Invoice Checker automatically scans any web page for Japanese consumption tax invoice registration numbers (T + 13 digits) and verifies them against the National Tax Agency (NTA) official API in real time. **Key Features** - **Auto-detection**: Scans the current page for invoice registration numbers as you browse, including PDF viewer pages - **Instant verification**: Checks each number against Japan's official NTA registry (web-api.invoice-kohyo.nta.go.jp) - **Visual highlights**: Valid numbers turn green; invalid numbers turn red — right on the page - **Manual lookup**: Enter any number directly in the popup for on-demand verification - **Verification history**: Review past checks with business name, address, and registration dates - **24-hour cache**: Repeat lookups are served instantly without hitting the API again - **Freemium**: 10 free verifications per month; upgrade to Pro for unlimited checks ($6.49/mo) **How to Use** 1. Install the extension 2. Navigate to any web page containing invoice numbers (e.g., invoices, quotations, purchase orders) 3. Numbers matching the T + 13-digit pattern are automatically highlighted 4. Click the extension icon to see a list of detected numbers with their verification status 5. Use the manual input field to verify any number on demand **Perfect for** - Accounting and bookkeeping professionals - Small business owners handling Japanese invoices - Procurement teams verifying vendor registration **Privacy & Data** - No personal data is collected or stored on external servers - Invoice numbers are sent only to the official NTA API (web-api.invoice-kohyo.nta.go.jp) for verification - All data is stored locally in your browser using chrome.storage.local - No tracking, no ads, no third-party analytics beyond anonymous usage stats
Details
- Version1.1.2
- UpdatedJune 26, 2026
- FeaturesOffers in-app purchases
- Size130KiB
- Languages4 languages
- DeveloperWebsite
Email
shota.katougi@gmail.com - Non-traderThis developer has not identified itself as a trader. For consumers in the European Union, please note that consumer rights do not apply to contracts between you and this developer.
Privacy
This developer declares that your data is
- Not being sold to third parties, outside of the approved use cases
- Not being used or transferred for purposes that are unrelated to the item's core functionality
- Not being used or transferred to determine creditworthiness or for lending purposes
