Developer Tools Calculators
Unix timestamp, UUID, hash, regex, JWT peek, Base64, cron, HTTP status, and more.
13 tools
- Bandwidth Calculator Transfer time from size and speed.
- Base64 Encode / Decode Encode or decode Base64 text.
- Cron Expression Explainer Explain a 5-field cron expression (minute hour dom month dow).
- HTTP Status Code Lookup Look up common HTTP status codes and meanings.
- IP Subnet Calculator IPv4 subnet mask and hosts (CIDR).
- JWT / JSON Peek Calculator Decode JWT header/payload (no signature verify) or measure JSON size.
- Password Generator Generate a strong random password.
- QR Payload Length Calculator Estimate QR version needs from text length (guidance only).
- Regex Tester Test a JavaScript regular expression against sample text.
- SHA-256 Hash Calculator Hash text with SHA-256 using Web Crypto (browser-only).
- Unix Timestamp Converter Convert between Unix epoch seconds and human date/time.
- URL Encode / Decode Encode or decode URL components.
- UUID Generator Generate random UUID v4 values in your browser.