SEO & Marketing tools. In your browser.
Every SEO & Marketing tool in the Digital Heroes library, client-side, free, no signup. Nothing is uploaded or saved to a server.
A free online tool by Digital HeroesAnchor Text Analyzer
Free Shopify SEO anchor text keyword tool. Paste HTML, categorise anchors as branded / URL / generic / partial-match / exact-match,…
Article Schema Generator
Free Article schema generator with URL + image fields. Fill form, copy JSON-LD aligned with Google Article required fields. Supports…
Backlink Signal Checker
Free backlink verifier tools. Paste candidate URLs — fetches each, confirms link is live, reports anchor + rel + dofollow. Verifier…
Breadcrumb Schema Generator
Free BreadcrumbList schema generator for any home or page route. Build the navigation trail in JSON-LD with one ListItem per crumb.…
Cache-Control + Max-Age Headers Checker
Free cache headers + max-age checker. Paste curl -I, parses Cache-Control max-age, ETag, Last-Modified, Expires. Letter-grade caching…
Canonical URL Checker
Free canonical URL checker tool for Google SEO. Paste page HTML, extracts rel=canonical, validates absolute + HTTPS, flags duplicate…
CDN Detector
Free CDN + edge web detector. Paste curl -I, identifies Cloudflare, Fastly edge, CloudFront, Vercel, Netlify, Akamai web CDN, Bunny +…
Shopify CMS Platform Detector
Free CMS detector with platform-confidence score. Paste HTML source, we identify WordPress, Shopify, Squarespace, Wix, Webflow, Ghost,…
Compression Detector
Free compression detector + Vary headers audit. Paste curl -I, checks Content-Encoding (gzip / br / deflate / zstd), validates Vary…
Page Cookies Analyzer
Free page cookies analyzer. Paste Set-Cookie headers, get name / domain / path / expiry / Secure / HttpOnly / SameSite per cookie, plus…
Core Web Vitals First Data Checker
Free Core Web Vitals checker. First Contentful Paint, field data (28-day p75 from CrUX), lab data for LCP, INP, CLS, FCP, TTFB. Mobile…
CORS URL Requests Checker
Free CORS checker API tool. Real browser URL fetch from origin across 4 method requests. Reports exact CORS error or success. Privacy:…
CSP Validator
Free Content Security Policy validator with scripts audit. Paste your CSP — get per-directive parsing for unsafe-inline, unsafe-eval,…
CSS Google Size Checker
Free CSS web development size checker for Google PSI. Live PSI lists every stylesheet with byte size + 1P/3P split + render-blocking +…
CNAME Lookup
Free CNAME lookup tool for web development. Enter a hostname, queries Cloudflare DoH for canonical-name record, follows alias chain to…
DNS Domain DMARC Lookup
Free DNS domain lookup .com tool. Live A, AAAA, MX, TXT, DMARC, NS, CNAME, CAA records via Cloudflare DNS-over-HTTPS. Browser-only, no…
MX Record Checker Tool
Free MX record email checker tool. Enter a domain, queries Cloudflare DoH (1.1.1.1) for mail-server records, lists each by priority,…
DNS Propagation Cloudflare Google Tool
Free DNS propagation checker tool. Queries Cloudflare 1.1.1.1 and Google 8.8.8.8 in parallel for the same record. Spot global…
Domain Age + Registration Checker
Free domain age checker. Cross-references the RDAP registration date with the Wayback Machine's first-capture date. Surfaces…
Domain Authority Checker
Free domain authority checker, an alternative signal vs Moz DA + Ahrefs DR. Composite site-maturity score from Wayback age + DNS + TLS…
Domain Availability Checker
Free domain availability checker tool. Live RDAP registry lookup tells you which registrar holds any .com / .ai / .io / .co / ccTLD or…
Domain Health Checker
Free composite domain health checker with grade. DNS signal (A/AAAA/MX/TXT), SSL status, domain age, Wayback archive, PageSpeed score…
Email List Cleaner
Validate, dedupe & clean email lists locally — syntax checks, disposable-domain detection, CSV export.
Event Schema + Offers Generator
Free Event schema generator with ISO dates. Venue + offers + status. Inline validator catches missing eventStatus, location, organizer,…
External Links Counter
Free external link counter. Paste HTML — splits internal vs external, audits rel attributes, flags missing rel=noopener security.…
FAQ Schema Generator
Free FAQPage schema generator with visible Google Rich result validator. Add unlimited Q+A pairs, valid JSON-LD with required fields,…
Hashtag Generator
Turn keywords or a topic into relevant, ready-to-paste hashtags for social.
Google Heading Hierarchy Checker
Free heading hierarchy checker per page for Google SEO. Paste HTML, parses H1-H6 page outline, flags multiple H1s, skipped levels,…
Heading Page Outliner Services
Free heading structure hierarchy outliner services for SEO. Paste HTML, get H1-H6 outline with warnings for missing H1, skipped levels,…
Hosting + Cloudflare Web Development Detector
Free hosting provider web development detector. Live DoH lookup + ipapi.co ASN — identifies AWS, GCP, Azure, DigitalOcean, Vercel,…
Hreflang Links + Locale Checker
Free hreflang checker. Paste your page HTML — extracts every rel=alternate hreflang tag, validates ISO codes, x-default presence, and…
Hreflang Generator
Free hreflang generator for Google. Output HTML tags, XML sitemap xhtml:link, or HTTP headers. Built-in reciprocal validator. 4 preset…
HTTP Headers Checker
Free HTTP headers checker. Paste curl -I or DevTools browser headers. Audits caching, CSP security (HSTS, X-Frame), compression, server…
HTTP Status Code Checker
Free HTTP status code checker. Type URL — live fetch returns status code, content-type, server, response time. Bulk-check up to 20…
HTTP/2 + HTTP/3 Checker
Free HTTP protocol checker. Paste curl -I — header audit identifies HTTP/1.1 vs HTTP/2 vs HTTP/3, validates Alt-Svc. Web development…
HTTPS / SSL / TLS Checker
Free HTTPS / SSL / TLS checker for any domain. Live reachability + Certificate Transparency lookup (crt.sh) for issuer + cert history +…
Image Alt Text Checker
Free image alt text checker. Paste HTML; we scan every <img> tag, flag missing alt, empty alt, filename-as-alt, screen-reader and…
Image Format Checker
Free image format checker. Paste HTML — scans every img tag for format (jpg/png/webp/avif/svg), lazy-loading, srcset, modern-images…
Internal Link Counter Tool
Free Shopify internal links counter tool. Paste page HTML — counts every internal vs external link, lists unique destinations, flags…
IP Geolocation Lookup
Free IP geolocation lookup tool. Enter IPv4 / IPv6 IPs — returns country, region, city, ISP, ASN, timezone. Powered by ipapi.co live…
IP Lookup Tool
Free IP lookup tool. Resolves a domain to its A and AAAA records, then performs reverse DNS (PTR) on each IP to surface the hosting…
JavaScript Framework Detector
Free JS framework detector tool. Paste HTML — identifies React, Vue, Angular, Svelte, plus state mgmt (Redux, Zustand, Pinia),…
JavaScript Web Size Checker
Free JavaScript web development size checker. Live PSI fetch lists every JS file with size + first-party vs third-party split + INP…
Keyword Density Checker
Analyze 1–3 word keyword frequencies & density in any text or HTML — with target-keyword tracking.
Lighthouse Mobile Performance Checker
Free Lighthouse audit + score checker for any URL. Mobile performance, SEO, Accessibility, Best Practices live via PSI. Mobile +…
LocalBusiness Schema Generator
Free Google LocalBusiness schema generator with address. Fill form, copy JSON-LD with address, geo coords, weekday hours, telephone,…
Meta Description Checker
Free Google meta description checker tool. Paste description or full HTML; we check length (120-155 char), pixel-width truncation, CTA…
Meta Tag Generator
Free meta tag generator. Build HTML meta tags, Open Graph, and Twitter Card with live Google SERP, Facebook, and X previews.
Mobile-Friendly Test
Free mobile-friendly test. Live Google PSI mobile audit — checks viewport, tap targets, font size, content width. Verdict + per-issue…
Multi-URL Audit
Free bulk SEO audit. Run Google PSI on up to 5 URLs in sequence — comparison table of Performance, SEO, Accessibility, Best Practices…
Social / OG Image Maker
Design a 1200×630 social share image with title, gradient & logo — export PNG.
Open Graph Image Card Preview
Free Open Graph image preview card tool. Test how OG cards and tags render on Facebook, X, LinkedIn, Slack, WhatsApp from any URL.…
Page Weight Analyzer
Free page weight analyzer for web development. PSI byte breakdown by type — HTML, CSS, JS, image, font, third-party. Per-type budget…
Product Schema Generator
Free Product schema generator. Fill the form, copy JSON-LD with offers, aggregateRating, brand, GTIN/SKU. Aligned with Google Product…
Readability Checker
Free readability checker. Paste text; get Flesch Reading Ease, Flesch-Kincaid grade, Gunning Fog, SMOG, ARI scores and sentence-level…
Reading Time Calculator
Free reading time WPM calculator with figure-aware count. Live count of words and content reading time across slow / average / fast /…
Redirect Chain Checker
Free HTTP redirect chain checker. Paste curl -ILv output — traces 301/302/307/308 redirects hops, flags chain length, mixed status,…
Render Blocking Checker
Free render-blocking resources checker. Live PSI web development LCP audit lists every CSS / JS file blocking initial render with byte…
Review Schema Generator
Free Reviews schema generator for Google rich results. Fill the form for individual Review or aggregate AggregateRating with star…
Robots.txt Generator
Free robots.txt generator. Presets for Shopify, WordPress, Webflow, Next.js. Individual toggles for every AI crawler (GPTBot,…
Robots.txt Tester
Free robots.txt disallow tester. Paste robots.txt and a URL; we run the live RFC 9309 longest-match for Googlebot, Bingbot, GPTBot,…
Schema Markup Generator
Free schema markup generator. Valid JSON-LD for Article, Product, FAQPage, LocalBusiness, Event, and BreadcrumbList. Tested for Google…
On-Page SEO Checker
Paste a page’s HTML for an instant on-page SEO audit — titles, headings, alts, OG & more.
SERP Preview Generator
Free SERP preview generator. See your title, URL, and meta description rendered as a Google search-result title snippet, mobile +…
Site Health Checker
Free site health checker via Google Lighthouse PSI. 4-cat composite (Performance + SEO + A11y + Best Practices) → grade + top 5…
URL Slug Generator
Turn any title into a clean, SEO-friendly URL slug — bulk mode, separators & accent handling.
SPF DKIM DMARC Checker Tool
Free SPF, DKIM, and DMARC checker tool. Enter a domain — queries Cloudflare DoH for the email-auth TXT records and validates SPF…
SSL Certificate Inspector
Free SSL certificate inspector tool. Pulls the most-recent cert from public Certificate Transparency logs (crt.sh) and lists SAN domain…
SSL Expiry Monitor Tool
Free SSL expiry monitor tool. Paste up to 20 hostnames at once for cert expiry — days-remaining + renewal status per .com / .net…
Structured Data Validator Tool
Free structured data validator tool. Paste JSON-LD or microdata; we parse, walk every node, and check required fields, ISO formats,…
Subdomain Finder Tool
Free subdomain finder tool. Enumerates every public sub-domain .com ever issued an SSL certificate via crt.sh Certificate Transparency…
Tech Stack Detector Tools
Free tech stack detector tools. Paste HTML — we identify JS framework, CSS framework, analytics, payment, ads, chat, CRM, A/B test…
Title Tag Checker
Free title tag checker brand keyword tool. Paste a title or full HTML; we run length, pixel-width, brand-presence, capitalization, and…
X / Tweet Preview
Compose with a weighted character counter (URLs = 23), thread splitter & live preview.
Twitter Card Validator
Free Twitter Card validator with summary preview. Paste page HTML — extracts every twitter:card / title / description / image meta…
User Agent Parser
Free user agent parser tool. Paste a UA string — Chrome/Mozilla version, browser, OS, device, engine, bot detection. Auto-fills your…
Wayback Archive Viewer
Free Wayback Machine viewer tool. Find the first archived domain URL capture plus year-by-year snapshots back to 1996. Browser-only, no…
Web Server Detector
Free web server CDN origin stack detector. Paste Server / X-Powered-By / response headers — we identify nginx, Apache, IIS, Caddy,…
Website Audit
Free website audit tool. Enter a URL, get a Digital-Heroes-branded scorecard across Performance, SEO, Accessibility, and Best…
WHOIS Lookup
Free WHOIS lookup. Real registrar, creation date, expiration, name servers, and status from the live RDAP registry. Browser-only, no…
XML Sitemap Generator
Free XML sitemap generator. Paste URLs or upload CSV, set priority, changefreq, lastmod, image + hreflang annotations. Auto-splits…
XML Sitemap Validator
Free XML sitemap URLs validator. Paste a sitemap.xml; we parse it, check urlset namespace, validate every URLs loc / lastmod /…
YouTube Tag Generator
Generate SEO-optimized YouTube tags from your video title — ranked, deduped, within the 500-character limit. Like RapidTags, but…
