Guide
Browser-Local Payment Code Checks
Learn how browser-local IBAN, BIC/SWIFT, SEPA, invoice, CSV, and test-data checks avoid uploads, logins, storage, analytics events, and URL input.
Who needs payment codes to stay off a server
Users and teams that want quick payment-code checks without uploading sensitive payment details or creating an account.
What stays local and what still uses the network
| Stage | What happens | Sensitive-value boundary |
|---|---|---|
| Page load | HTML, CSS, JavaScript and static reference data are downloaded | No payment code is needed to load the page |
| Typing or pasting | The browser normalizes and evaluates the value in memory | The entered value is not placed in the URL |
| Result display | The same page renders local format findings | No account lookup or bank API request occurs |
| Copy or CSV export | The browser creates user-requested output | The output can contain sensitive values and needs careful handling |
What browser-local checks mean
Browser-local checks run in the page on your device. BankCodeKit tools are designed so user-entered IBANs, BICs, invoice details, CSV rows, and payment references can be checked without uploading them to a server.
No upload, no login, no persistent storage
The tools do not require a user account. They do not store full payment details in localStorage, cookies, analytics payloads, advertising scripts, server logs, or URLs.
Why sensitive values should stay out of tracking systems
Payment details can be sensitive. They are not sent to analytics tools, ad scripts, debugging logs, URL query strings, or email by BankCodeKit tools.
A practical way to inspect the boundary
Open browser developer tools before entering a synthetic test value, clear the Network panel, run the check and review requests created during that interaction. Also inspect the page URL and browser storage. Repeat the observation after a fresh reload. This can help verify the implementation boundary, but it does not make a shared device, clipboard history, downloaded CSV file or browser extension safe.
Boundary case: local code on a managed device
A tool can keep an IBAN out of its own network requests while device-management software, a browser extension or clipboard history still records what appears on screen. On a managed workplace computer, review the applicable monitoring and data-handling policy before entering payment details. On a shared machine, use only synthetic examples. Local processing narrows the site's data path; it cannot control software installed elsewhere on the device or copies created after a user presses Copy or Download.
Practical local-check workflow
A user can paste a value into a tool, review the local result, copy a formatted version when appropriate, and clear the tool without creating an account.
- IBAN Checker: checks the visible value in the browser.
- Bulk IBAN Format Checker: creates CSV results in the browser only.
- Invoice Formatter: copies a text block without saving it.
- Contact page: warns users not to email sensitive payment details.
What local processing does not protect against
Format checks only. This guide does not confirm account existence, ownership, bank reachability, or payment success. Read the detailed disclaimer for the full limitation list.
- Browser-local checking does not confirm account existence.
- Browser-local checking does not confirm account ownership.
- Browser-local checking does not provide bank connectivity, sanctions, fraud-risk, or legal screening.
- Browser-local checking does not confirm payment readiness or payment success.
FAQ
Are values uploaded to BankCodeKit servers?
The tools are designed for browser-local checks, so user-entered payment details should not be uploaded.
Does BankCodeKit put input in URLs?
No. Tool input should not be placed in URLs or query strings.
Should I email payment details for support?
No. Do not email IBANs, BICs, invoices, CSV files, account numbers, or other sensitive financial details.
Can local checks replace bank or recipient confirmation?
No. Local checks are format review only and do not replace confirmation with a bank, payment provider, invoice issuer, or recipient.
Sources for Browser-Local Payment Code Checks
Public references for Browser-Local Payment Code Checks are linked below; detailed standard scope, review methods, and licensing boundaries are documented on the Sources and Updates page.
- Swift IBAN Registry
- ISO 13616-1:2020 IBAN structure standard
- Swift BIC / ISO 9362 information
- ISO 9362:2022 BIC standard
- European Payments Council SEPA scheme countries list
Matching the cited format and reference data for Browser-Local Payment Code Checks does not confirm account existence, ownership, bank reachability, or payment success. Read the detailed disclaimer.
Reference data reviewed: 2026-07-17 Next scheduled data review: 2026-10-17 Sources: Swift IBAN Registry, Swift BIC / ISO 9362 information, European Payments Council SEPA scheme countries list Reference data is reviewed periodically. BankCodeKit does not perform live bank, account, sanctions, or payment-network confirmation.