SEO and Site Utility Online Tools
Free online seo and site utility including JSON formatter, text compare, hash generator, Base64 encoder, URL parser, and more. With 27 IO Tools helps you quickly format, convert, encode, and work with data directly in your browser. Most tools run locally for speed and privacy, and most tool inputs are not stored on our servers. Some features that require storage (for example, Quick Paste) store data only to provide that feature. Built to keep useful tools simple, fast, and all in one place - dmlub2Ro
SEO and Site Utility
27 tools
UTM Builder
Build campaign tracking links with UTM parameters for analytics.
Open Graph Twitter Card Preview
Preview Open Graph and Twitter card metadata from URL or pasted HTML before publishing.
XML Sitemap Validator
Validate sitemap XML syntax, URL entries, duplicates, and sitemap index structure.
Robots.txt Tester
Test robots allow/disallow behavior for any user-agent and path.
Schema Markup Validator
Parse and validate JSON-LD schema markup with missing-field warnings.
Broken Link Checker
Crawl a single page and detect outbound links that are broken or unreachable.
Slug Generator
Create clean SEO-friendly URL slugs from text.
Robots.txt Generator
Generate clean robots.txt files with allow/disallow paths, sitemap links, and crawler directives.
XML Sitemap Generator
Generate XML sitemaps from page paths with configurable changefreq and priority defaults.
CSP Generator
Build Content-Security-Policy headers from common directives for production-ready deployment.
CSP Evaluator
Analyze CSP header strings for missing directives, duplicate rules, and weak security patterns.
HTTP Header Checker
Parse and inspect raw HTTP headers with duplicate detection and security header checks.
Canonical URL Generator
Normalize URLs and generate canonical link tags for SEO consistency.
Hreflang Generator
Generate alternate hreflang tags from locale and URL rows.
Meta Description Generator
Draft and validate meta title/description length with snippet preview output.
Redirect Rules Generator
Generate Apache or Nginx redirect rules from old,new URL maps.
Color Contrast Checker
Check WCAG AA/AAA contrast ratio between two colors.
Robots Rule Tester
Test robots allow/disallow behavior for user-agents and paths.
Schema Markup Generator
Generate FAQ, HowTo, and Product JSON-LD schema markup.
HTML Heading Extractor
Extract H1-H6 heading outline from HTML snippets.
CSP Nonce Hash Generator
Generate CSP nonce and hash values for inline scripts.
URL Batch Analyzer
Analyze URL lists for domains, protocols, and query params.
HTML Link Extractor
Extract links and asset URLs from HTML content.
Sitemap Auditor
Audit sitemap XML for duplicates and invalid URLs.
Robots Meta Generator
Generate robots meta tag and X-Robots-Tag directives.
URL Normalizer
Normalize URL lists by stripping trackers and sorting params.
HTML Meta Extractor
Extract title, description, canonical, and OG tags from HTML.