IBAN / Phone Validator is part of DevStudio — a free, in-browser collection of developer utilities that work without sign-up, installation, or any backend service. Validate IBANs (mod-97 + bank/branch extraction across 80+ countries) and parse phone numbers to E.164 / international / RFC 3966, all running entirely on your device. Because the page never uploads what you paste, you can run sensitive payloads, configuration files, secrets, or production data through it with confidence: nothing leaves your browser tab. Use IBAN / Phone Validator for ad-hoc debugging, code review, log triage, release prep, learning a new format, or as a quick scratchpad while you build. If you use this tool a lot, pair it with File Viewer, CSV Analyzer, .env Parser, and the rest of the DevStudio toolkit for related developer workflows.