Content-Type Header Builder
Build a Content-Type header with charset and boundary.
Use Content-Type Header Builder to assemble a spec-correct HTTP header you can paste straight into your server or CDN. It's the quick, free way to get caching, auth or content-type headers right the first time — no syntax guesswork.
About Content-Type Header Builder
Get the HTTP header right the first time. Content-Type Header Builder build a Content-Type header with charset and boundary from plain options, so you can paste a spec-correct header straight into your server, framework or CDN config. Like every ToolJolt utility it runs 100% in your browser — no sign-up, no upload, and nothing ever sent to a server, so it's safe for proprietary code and confidential data.
How to use Content-Type Header Builder
- 1Choose the options that match your use case.
- 2The correct HTTP header is assembled instantly.
- 3Copy it into your server, CDN or framework config.
- 4Adjust the options and the header updates live.
Why use Content-Type Header Builder?
- ✓Builds a spec-correct header you can paste straight in
- ✓Explains each option so you pick the right value
- ✓Copy the header (and equivalents) in one click
- ✓Avoids subtle, hard-to-debug header mistakes
Frequently asked questions
Where do I add the header from Content-Type Header Builder?+
Send it as an HTTP response (or request) header from your server, framework or CDN — Nginx, Apache, Express, Cloudflare, Vercel and others all let you set custom headers.
Why does getting this header right matter?+
Correct headers control caching, content negotiation, authentication and security behaviour. A small mistake causes stale content, broken auth or failed requests — this tool gets the syntax right for you.
Is Content-Type Header Builder free?+
Yes. Content-Type Header Builder is completely free with no sign-up, no account, no usage limits and no watermarks. Use it as often as you like.
Does Content-Type Header Builder send my data to a server?+
No. Content-Type Header Builder runs entirely in your browser with JavaScript — your input never leaves your device, which makes it safe for private API payloads, schemas and source code.
Embed Content-Type Header Builder on your website
Want Content-Type Header Builderon your own site? Paste this snippet into any HTML page — it's free, with no API key or sign-up. The tool loads in an iframe and keeps working exactly as it does here.
<iframe src="https://tooljolt.com/tools/content-type-builder" width="100%" height="640" style="border:1px solid #e5e7eb;border-radius:12px;max-width:680px" title="Content-Type Header Builder — ToolJolt" loading="lazy"></iframe>