WhiteKit brings together 55 developer tools in one place: formatters (JSON, XML, SQL, YAML), converters, security utilities (JWT, hashing, encoding), network calculators, and text tools.
Everything runs 100% client-side. Your data never leaves your device, so you can safely paste API keys, tokens, and production payloads. No sign-up, no upload step, and it keeps working offline once loaded.
Each tool is built to handle real edge cases rather than just the happy path โ the cron parser implements Quartz 6-field semantics correctly, the IPv6 ULA generator follows RFC 4193 Appendix A, and the subnet calculator handles /31 and /32 edge cases.
Listed in
100% Client-Side Processing
100% client-side โ nothing you paste leaves your browser
No sign-up
No sign-up, no account, no usage limits
Offline Capable
Works offline once the page has loaded
Unified Toolset
55 tools in one place with instant Ctrl+K search
Formatters
JSON, XML, SQL, HTML, CSS, JavaScript, YAML
Converters
Base64, URL, timestamp, number base, JSON/YAML
Network
IPv4/IPv6 subnet calculators, CIDR, MAC address tools
Text
Diff, case conversion, counting, escaping
Reference
HTTP status codes, cron syntax, regex cheatsheets
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