Web & Network

Web & Network — 10 free browser-based developer tools including HTTP Status Code Reference, HTTP Header Parser and User Agent Parser. Everything runs locally with no signup or uploads, so your data stays private and results are instant.

10 tools

HTTP Status Code ReferenceHTTP status code reference covering every code from 1xx to 5xx, including 200 OK, 404 Not Found and 500, with meaning, usage and RFC source. Free and searchable in your browser.

HTTP Header ParserHTTP header parser that turns raw request and response headers into key-value pairs and explains them. It also analyzes security and caching headers such as Cache-Control, CSP and HSTS, free in your browser.

User Agent ParserFree online tool to parse User-Agent strings and identify the browser, operating system, and device type. Paste any UA string; it is analyzed in your browser and the static data engine also works offline and on mobile.

MIME Type LookupFree online MIME type lookup that finds the right MIME type from a file extension or reverse-searches extensions by type.

URL ParserFree online tool to parse URLs into components like protocol, host, port, path, query, and hash, and analyze query parameters. It auto-adds https:// when missing and uses the browser URL API for encoding.

OG Tag PreviewOpen Graph preview tool that shows how your link appears on Facebook, X and messengers, checking og:title, og:image and og:description. Free and instant in your browser.

Robots.txt GeneratorRobots.txt generator with a visual editor for user-agent, allow and disallow paths, crawl-delay and sitemap location. It produces a valid robots.txt file ready to copy to your website, free in your browser.

Sitemap XML GeneratorSitemap.xml generator that turns a list of page URLs into a valid XML sitemap with optional lastmod, changefreq and priority fields. Copy it and submit to Google Search Console, free in your browser.

Htaccess Redirect GeneratorFree online .htaccess generator that builds Apache redirect rules for you. Add 301 or 302 redirects, www and HTTPS rules and custom paths, then copy ready .htaccess RewriteRule code.

CSP Header GeneratorContent-Security-Policy generator with a visual editor for default-src, script-src and other directives, producing a ready-to-deploy CSP header. Free and instant, so you can harden your site against XSS.

How to Use

1
Read what the server actually sent— Paste a raw response into the HTTP Header Parser to see cache, CORS and security headers separated, then look up the status code and the MIME type it returned.
2
Generate the config file— Build a robots.txt, a sitemap.xml, a Content-Security-Policy header or a set of .htaccess redirects from a form instead of hand-writing the syntax.
3
Preview before you publish— OG Tag Preview renders the card exactly as a chat app or a social feed would, while URL Parser and User Agent Parser break a long string into its named parts.

Frequently Asked Questions

Use 301 when the move is permanent: search engines pass ranking signals to the new URL and browsers cache the redirect. Use 302 for temporary moves such as A/B tests or maintenance pages. The Htaccess Redirect Generator writes either one as an Apache RewriteRule, and the HTTP Status Code Reference covers the rest of the 3xx family.

robots.txt tells crawlers which paths they may request; it is not a way to keep a page out of the index, because a disallowed URL can still be listed if other sites link to it. A sitemap does the opposite job, listing the URLs you do want crawled along with lastmod and priority hints. Generate both here and point to the sitemap from the last line of robots.txt.

Usually one of og:title, og:description or og:image is missing, or og:image points at a relative path instead of an absolute URL. Paste your page's HTML into the OG Tag Preview to see the card as Facebook, X and messengers would build it, and use the OG Image Generator for a 1200x630 image if you don't have one.