Free tools
Free cloud and developer tools
Small, fast utilities that run entirely in your browser. No sign-up, no uploads, no tracking of what you type.
All client-side: nothing leaves your browser
8 tools
- CIDR Subnet CalculatorNetwork, broadcast, mask, host range and binary view for any IPv4 CIDR block, plus a split into equal subnets.Open tool
- SLA Uptime CalculatorTurn an uptime percentage into allowed downtime, and work out the combined availability of serial and parallel components.Open tool
- JWT DecoderRead a JSON Web Token’s header and claims locally, with readable expiry dates. Decoding only, never verification.Open tool
- YAML ⇄ JSON ConverterConvert between YAML and JSON for docker-compose, Kubernetes and CI snippets, with clear line-numbered errors.Open tool
- chmod Permission CalculatorTick read, write and execute boxes to get the octal mode, the rwx string and the chmod command, or go the other way.Open tool
- HTTP Status Code LookupSearch standard HTTP status codes with plain-English meanings, when to use them, and common API and CDN notes.Open tool
- Unix Timestamp ConverterConvert epoch seconds or milliseconds to ISO, UTC and any time zone, and back, with a live clock and relative time.Open tool
- Colour Contrast CheckerWCAG 2.2 contrast ratio for two colours with AA and AAA results, a live preview and the nearest passing shade.Open tool
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