A lightweight, privacy-first suite of universal web utilities running 100% on the client side. Convert Excel to customized vCards, calculate metrics, and more instantly offline.
frontend serverless toolkit single-page-app developer-tools privacy-first contact-cards vcard-converter excel-to-vcf web-utilities client-side-tools vcf-tools utilities-hub vcard-tools worksheet-to-contact
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Updated
Jun 13, 2026 - HTML