Web & SEO
SEO tools, keyword density, HTTP tester, CORS generator, security headers and more
All 6 web and SEO tools run entirely in your browser. Test HTTP endpoints, generate CORS and security headers, analyse keyword density and preview meta/Open Graph tags — everything a web developer or content marketer needs, directly in your browser with zero setup.
6 tools
HTTP Request Tester
Test HTTP endpoints with custom headers and body
API Header Viewer
Parse and inspect HTTP headers from raw text
Keyword Density Checker
Analyze text and find the frequency and density of each keyword
SEO Tools
Generate meta tags, Open Graph, robots.txt, UTM links, JSON-LD schema and web manifest
CORS Header Generator
Generate CORS response headers for your API — configure origins, methods, headers and credentials
HTTP Security Headers Generator
Generate production-ready HTTP security headers — HSTS, CSP, X-Frame-Options, Referrer-Policy, Permissions-Policy and CORP/COOP. Output for Nginx, Apache and raw headers.
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About Web & SEO
A complete set of web development and SEO utilities for developers and content teams. All 6 tools provide instant results client-side — from live HTTP request testing and CORS configuration to on-page SEO auditing and IP geolocation.
Features
- ✓HTTP request tester — send GET, POST, PUT, DELETE and PATCH requests, inspect status codes, headers and response bodies
- ✓CORS header generator — generate correct Access-Control-Allow-* header configurations for any origin/method combination
- ✓API header viewer — inspect all HTTP request and response headers sent by any endpoint
- ✓HTTP security headers generator — produce CSP, HSTS, X-Frame-Options, X-Content-Type-Options, Referrer-Policy and Permissions-Policy configurations for Nginx and Apache
- ✓Keyword density analyser — count keyword frequency and density percentage across any text
- ✓SEO tools — meta tag previewer, Open Graph tag generator with social card preview, robots.txt generator, UTM link builder and JSON-LD schema generator
- ✓All analysis tools run entirely in your browser — no data is transmitted
Common Use Cases
- Test an API endpoint with custom headers and a JSON body before integrating it into your app
- Generate the correct CORS headers for an API that needs to serve multiple allowed origins
- Generate production-ready HTTP security headers (CSP, HSTS, Referrer-Policy) for an Nginx or Apache config
- Check keyword density in a blog article before publishing for on-page SEO
- Inspect all headers returned by a CDN or server to debug caching or security policy issues
- Preview how a page's meta and Open Graph tags appear in Google, Twitter and LinkedIn shares
Frequently Asked Questions
QIs my content sent to a server?
Text analysis tools (keyword density) run entirely in your browser. The HTTP request tester sends requests to the URLs you specify — that is by design. All other tools are 100% local.
QWhat is keyword density and why does it matter?
Keyword density is the percentage of times a keyword appears in a piece of content relative to the total word count. A density of 1–3% is generally considered natural; higher values can be flagged as keyword stuffing by search engine crawlers.
QWhat HTTP methods does the request tester support?
GET, POST, PUT, PATCH, DELETE, HEAD and OPTIONS. Custom headers, query parameters and request bodies (JSON, form data, plain text) are all supported.
QWhat does the CORS header generator produce?
It generates the exact Access-Control-Allow-Origin, Access-Control-Allow-Methods, Access-Control-Allow-Headers and Access-Control-Max-Age headers needed for your CORS configuration, with explanations for each value.
QWhat does the HTTP security headers tool check?
It fetches the response headers from your URL and evaluates: Content-Security-Policy, Strict-Transport-Security, X-Frame-Options, X-Content-Type-Options, Referrer-Policy and Permissions-Policy — reporting missing or misconfigured headers.
See Also
- HTTP Request TesterSend HTTP requests and inspect responses in your browser
- CORS Header GeneratorGenerate correct CORS header configurations
- API Header ViewerInspect all HTTP request and response headers
- Security HeadersAudit CSP, HSTS, X-Frame-Options and other security headers
- Keyword DensityAnalyse keyword frequency and density in any text
- SEO ToolsMeta tag and Open Graph tag generator with social card preview
- Developer ToolsHTTP status codes reference, regex tester, diff viewer and more