# HTTP header checker

> Free HTTP header checker. See every response header a URL returns, with security headers like HSTS and CSP and the caching headers explained. No sign-up.

Canonical: https://crawlwise.site/tools/headers

The HTTP header checker requests a URL and lists every response header it returns, with the security and caching headers explained in plain language.

- Free, no sign-up
- Results in seconds
- Checker · 35 free tools

This checks one page. The same problem usually repeats on every page built from the same template. Plans start at $14.99 a month.

[Crawl the whole site](https://crawlwise.site/plans) [Run a full audit](https://crawlwise.site/#audit-url)

## How to use the http header inspector

1. ### Paste an address

   A full URL or just a domain. We add https:// when it is missing.
2. ### We fetch it live

   Our server requests the page now, the way a crawler would, and records what came back.
3. ### Read the evidence

   Every result shows the value we read, so you can see why it passed or failed.
4. ### Fix and check again

   Change the page, run it once more, and ship when the second run agrees.

### What this does not measure

We would rather say what a tool cannot see than let a clean result mislead you.

- It shows one response from one location. A CDN may serve a different set of headers to a different region.
- HSTS and CSP are reported as present or absent, not graded. Whether a policy is appropriate for your site depends on what your site does.
- Header names and values are shown as sent. It does not interpret a vendor-specific header it does not recognise.

Want the full picture?

This tool answers one question. A full audit runs every check on a page, scores it, and gives you a short list of what to fix first.

[Run a free audit](https://crawlwise.site/#audit-url)

## Questions about the http header inspector

More in the [guides](https://crawlwise.site/guides).

### What does the HTTP header inspector do?

Every response header for a URL, with the security and caching headers explained. Free, no sign-up.

### Do I need a Crawlwise account to use HTTP header inspector?

No. Every tool in the free toolkit runs without sign-up, card, or email. A full site audit and saved history require an account and credits.

### What can HTTP header inspector not tell me?

It shows one response from one location. A CDN may serve a different set of headers to a different region.

### How is this different from a paid SEO suite?

Crawlwise shows the evidence behind each result and prices work in credits. Suites bundle backlinks and ads research; we focus on measurable on-page health and crawler access.

### Can I run the same check on my whole site?

The free tool answers one URL or one question. Add a site in Crawlwise to crawl many pages, export reports, and track changes over time on paid plans.

### Will fixing what the tool flags improve rankings?

Nothing outside Google can promise rankings. Fixing real technical issues removes friction for crawlers and readers; it is necessary but not sufficient for visibility.

## Keep reading

[Blog](https://crawlwise.site/blog) [All guides](https://crawlwise.site/guides)

- [noindex vs robots.txt disallow: which one removes a page from Google?](https://crawlwise.site/blog/technical-seo/noindex-vs-robots-txt-disallow): Disallow stops crawling. noindex stops indexing. Using both at once means Google never reads the noindex.
- [HTTP status codes for SEO: 404 vs 410, soft 404s, 5xx, and 429](https://crawlwise.site/blog/technical-seo/http-status-codes-for-seo): Google treats 404 and 410 the same. 5xx and 429 slow crawling. A 200 error page is a soft 404.