unsent.tools

A growing set of single-purpose tools that run entirely in your browser. The name is the promise: nothing you type is sent anywhere — no backend, no network requests, no analytics, no ads. Each tool's logic is covered by tests before it ships.

• Subnet / CIDR calculator
  Network, broadcast, host range, mask, and count for any IPv4 CIDR block.
• JWT decoder
  Decode a JSON Web Token, explain its claims and expiry, and verify HMAC signatures — without pasting it into someone's server.
• URL inspector
  Break a URL into its parts, decode percent-encoding and punycode hostnames, and spot embedded credentials before you share it.
• Cron expression explainer
  Plain-English reading of any cron schedule, plus its next run times in your timezone or UTC.