Free tools

HSTS Header Generator

HSTS header generator. Build a Strict-Transport-Security header with max-age, includeSubDomains, and preload — then copy/paste.

Strict-Transport-Security
Seconds. Example: 1 year = 31536000.
Options
Only enable preload if you meet preload requirements and understand the impact.
Header output

HSTS header generator

HSTS (HTTP Strict Transport Security) tells browsers to use HTTPS for your domain for a period of time. Use this tool to generate a valid Strict-Transport-Security header line you can paste into your server or CDN config.

Recommended rollout

  • Start with a short max-age (e.g. 1 day) to test safely
  • Increase to longer durations once HTTPS is correct everywhere
  • Only enable preload if you understand the impact and meet the preload requirements

What the options do

  • includeSubDomains: applies HSTS to all subdomains
  • preload: signals intent to be included in browser preload lists

Related tools

CIDR Subnet CalculatorCORS Header CheckerHTTP Status Code LookupMIME Type LookupURL ParserUser Agent Parser

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