Web & SEO

Web and SEO utilities: meta tag previews, structured-data validators, sitemap parsers.

All Web & SEO

• QR Code Generator Generate QR codes for URLs, text, wifi, contact cards. Download as PNG or SVG.
• Meta Tag / OG Card Previewer See how your page looks when shared on Twitter, Facebook, LinkedIn, Slack.
• URL Slug Generator Convert any title into a clean URL slug. Handles unicode, custom separators.
• Sitemap.xml Validator Validate a sitemap.xml: schema, URL count, lastmod dates, priority ranges.
• SVG Optimizer / Minifier Strip metadata, simplify paths, minify SVG markup. Often 50-70% smaller.
• Favicon Generator Upload an image, get favicon.ico + every size for iOS, Android, browser tabs.
• RSS / Atom Feed Validator Validate RSS 2.0 and Atom feeds. Catches missing required fields.
• OpenAPI Spec Viewer Paste an OpenAPI/Swagger spec, get interactive docs without any setup.
• URL Parser & Builder Decompose a URL into protocol/host/path/query. Build URLs from parts.
• robots.txt Tester Test whether a URL is allowed for a given user agent against a robots.txt.
• Schema.org JSON-LD Generator Build Article, Product, FAQ, Breadcrumb, Organization JSON-LD blocks.
• Image Compressor — In-Browser Compress JPG / PNG / WebP entirely in browser. Quality slider, no upload.
• robots.txt Generator Build a robots.txt with allow/disallow rules per user agent. Sitemap declarations.
• Mermaid Live Preview Write Mermaid diagrams (flowcharts, sequence, ERD), see them rendered live.
• SVG Path Inspector Parse and visualize SVG <path> d attributes. See each command, point, control point.
• Lorem Picsum URL Builder Build placeholder image URLs. Dimensions, blur, grayscale, seed.
• UTM URL Builder Build UTM-tagged URLs for Google Analytics campaign tracking.
• Image Dimensions Reader Drop any image; see width, height, aspect ratio, file size, type. No upload.
• Image Metadata Stripper (EXIF) Remove EXIF, GPS, camera data from JPG/PNG. Browser-only — image never uploads.
• OpenGraph Image Builder Build 1200×630 share images in your browser. Background, title, subtitle, logo. Download PNG.
• Image Resizer (Browser-only) Resize JPG / PNG / WebP images in your browser. No uploads, full quality control.
• Image Format Converter (JPG ↔ PNG ↔ WebP ↔ AVIF) Convert images between JPG, PNG, WebP, AVIF in your browser. No upload, lossless option.
• Image Cropper (Canvas) Crop images in your browser with a draggable selection. Save to JPG / PNG / WebP.
• Image Placeholder Generator Generate placeholder images at any size with custom color and text overlay. Browser-only.
• User Agent Parser Parse a User-Agent string into browser, version, OS, device. Useful for log analysis.
• User Agent String Generator Generate User-Agent strings for browsers, mobile devices, and bots. For testing only.
• QR Code Reader (Upload or Camera) Read QR codes from an uploaded image or live camera. Browser-only — no upload to a server.
• SVG to PNG Converter (Custom Size) Convert SVG to PNG at any resolution. Preserves transparency. Browser-only, batch supported.
• PNG to ICO Favicon Converter Convert PNG images into multi-size .ico favicons. 16/32/48/64/128/256 in one file.
• WebP to PNG Converter Convert WebP images back to PNG. Preserves transparency. Browser-only.
• JPEG Quality Comparator (Side-by-Side) Compare a JPEG at multiple quality levels side-by-side. Find the sweet spot between size and visual quality.
• SVG Sprite / Icon Set Extractor Paste an SVG sprite or symbol set. Get a downloadable preview of every individual icon. Lucide, Heroicons, custom sprites.
• File Extension ↔ MIME Type Lookup Look up the MIME type for any file extension, or extensions for a MIME type. 1000+ entries indexed.
• Image Color Picker (Eyedropper Tool) Upload an image; click anywhere to pick the exact RGB / hex color of that pixel. Browser-only.
• SVG Cleaner (Strip Metadata + Comments) Strip editor metadata (Sketch / Figma / Illustrator), comments, and unused IDs from SVG. Smaller files, cleaner code.
• Browser Fingerprint Info (What Sites See) See what fingerprinting data your browser exposes: UA, screen, timezone, language, fonts, canvas hash, WebGL renderer.
• OpenGraph + Twitter Card Tester (Preview) Paste HTML or URL meta tags. Preview how the page renders on Facebook, Twitter, LinkedIn, iMessage.
• noindex / robots Meta Tag Tester Test a URL's robots meta tag, X-Robots-Tag header, and robots.txt rules. See if Google can index it.
• sitemap.xml Builder (From URL List) Paste a list of URLs; get a valid sitemap.xml with priorities, changefreq, lastmod.
• SEO Analyzer (On-Page Audit + Score) Enter a URL or paste HTML; get a 0-100 on-page SEO score across 40+ checks: meta, headings, links, images, schema, social. Deep-links to fix tools.
• URI Template Builder (RFC 6570) Build URLs from RFC 6570 URI templates. Variable expansion, query parameters, list / map formats.
• OpenSearch Description XML Builder Generate the opensearch.xml file to add your site as a browser search engine. Firefox / Chrome / Edge compatible.
• HAR Viewer Inspect a HAR file in your browser — request waterfall, status codes, sizes, timings, and totals. Filter by type or URL. Nothing uploaded.
• Postman to cURL Convert a Postman collection or request into runnable curl commands — methods, headers, query params, auth, and raw/form/urlencoded bodies.
• DNS Lookup Query A, AAAA, MX, TXT, NS, CNAME, SOA, CAA, and SRV records for any domain over DNS-over-HTTPS via Google or Cloudflare. Shows TTLs and status.
• Google SERP Preview Preview how your title and meta description appear in Google search, with live pixel-width measurement to catch truncation. Desktop and mobile layouts.
• Security Headers Analyzer Paste HTTP response headers for a graded security report — HSTS, CSP, X-Content-Type-Options, X-Frame-Options, Referrer-Policy and more, plus leak detection.
• SPF Record Generator Build a valid SPF (v=spf1) TXT record from the senders you allow — include:, ip4:, ip6:, mx, a — with the right ~all or -all policy and a check against the 10-lookup limit.
• SPF Record Parser & Explainer Parse an existing SPF record and explain every mechanism and qualifier in plain English, count DNS lookups, and flag the things that break SPF (too many lookups, +all).
• DMARC Record Generator Build a DMARC (_dmarc TXT) record — p=none/quarantine/reject, rua/ruf reporting, pct and alignment — with a sane rollout from monitor to enforce.
• DMARC Record Checker Parse and validate a DMARC record — policy, reporting addresses, alignment and percentage — and warn about the misconfigurations that quietly let spoofing through.
• DMARC Aggregate Report Reader Paste a DMARC aggregate (RUA) XML report and get a readable table — which sources passed SPF and DKIM, which failed, and how many messages each sent.
• BIMI Record Generator Generate a BIMI DNS record so your verified logo shows next to email in supporting clients — the SVG location and optional VMC certificate.
• MTA-STS Record & Policy Generator Generate both the MTA-STS DNS TXT record and the policy file that enforces TLS on inbound mail — testing or enforce mode, MX list and max_age.
• TLS-RPT Record Generator Generate a TLS-RPT (_smtp._tls TXT) record so you receive reports when inbound mail fails TLS — paste the reporting address, get the record.
• Email Header Analyzer Paste raw email headers and trace the delivery path — every Received hop with delays, plus the SPF, DKIM and DMARC authentication results. Runs locally.
• MX Record Lookup Look up a domain's MX records live and see every mail server with its priority, sorted, plus the primary — to confirm where email for the domain is delivered.
• NS Record Lookup Find the authoritative nameservers for any domain — query its NS records live and see exactly which DNS servers answer for it, with TTLs.
• TXT Record Lookup Look up all TXT records for a domain and see SPF, DKIM, DMARC, domain-verification and other entries, each detected and labelled, with TTLs.
• SOA Record Lookup Read a zone's SOA record — primary nameserver, hostmaster email, serial, and the refresh, retry, expire and minimum timers — decoded into plain values.
• CAA Record Checker Check which certificate authorities are allowed to issue TLS certificates for a domain — look up its CAA records and read the issue, issuewild and iodef tags.
• A Record Lookup Find the IPv4 address a domain points to — query its A records live, list every IP with TTLs, and detect a CNAME alias if there is one.
• CNAME Lookup Check the CNAME record for any hostname and see exactly what it aliases to, with the TTL — confirm whether a subdomain points at a CDN or SaaS host.
• Reverse DNS Lookup Find the hostname an IPv4 or IPv6 address maps back to — build the reverse pointer name and query its PTR record live. Accepts a hostname too.
• DKIM Record Checker Look up and validate a domain's DKIM public key by selector — key type, version and whether it is valid or revoked. Probes common selectors if you don't know yours.
• BIMI Record Checker Look up a domain's BIMI record, preview the brand logo SVG it points to, and see whether a VMC certificate is referenced — the quick BIMI rollout check.
• DNSSEC Checker Check whether a domain is signed and validating — read the AD flag from a validating resolver, the DS record at the registrar and the zone's DNSKEY.
• DNS Propagation Checker Check whether a DNS change has reached the major public resolvers — query Google, Cloudflare and Quad9 at once and see whether they agree yet.
• MTA-STS Checker Check a domain's MTA-STS setup live — the _mta-sts TXT record, the policy file and its mode — and cross-check it against the real MX hosts to catch an enforcing policy that misses a mail server.
• Subdomain Finder Discover a domain's subdomains passively from public Certificate Transparency logs (crt.sh) — a deduplicated, copyable list with wildcards flagged, no scanning of the target.
• Certificate Transparency Search Search public Certificate Transparency logs for every TLS certificate issued under a domain — issuing CAs, validity dates and recent certs from crt.sh — to audit issuance and catch mis-issuance.
• security.txt Generator Generate an RFC 9116 security.txt file for /.well-known/ — Contact, Encryption, Policy, Expires — so researchers know where to report a vulnerability.
• HSTS Header Generator Build a Strict-Transport-Security header — max-age, includeSubDomains and preload — and understand what you commit to before submitting to the preload list.
• Disposable Email Detector Check whether an email domain is a disposable or throwaway provider — paste one or a list and screen out temp-mail signups before they hit your database.
• RFC 5322 Email Validator Validate email addresses against RFC 5322 syntax — local part, quoted strings, domain and IP literals — beyond the naive regex, with a per-address reason for failures.
• Product Schema (JSON-LD) Generator Generate Product schema.org JSON-LD — name, image, brand, offers with price and availability, and aggregateRating — for rich product results in Google.
• LocalBusiness Schema Generator Generate LocalBusiness JSON-LD — address, geo, opening hours, phone and price range — so your business is eligible for local rich results.
• JobPosting Schema Generator Generate JobPosting JSON-LD — title, hiringOrganization, location, salary and dates — required to appear in Google Jobs.
• Event Schema Generator Generate Event JSON-LD — dates, location or virtual location, offers and performer — for event rich results and the knowledge panel.
• Article Schema Generator Generate Article, NewsArticle or BlogPosting JSON-LD — headline, author, publisher, dates and image — for article rich results in Search and Discover.
• Recipe Schema Generator Generate Recipe JSON-LD — ingredients, steps, times, nutrition and rating — for the recipe rich result with cook time and stars.
• VideoObject Schema Generator Generate VideoObject JSON-LD — name, thumbnail, upload date, duration and embed URL — so videos can show as a rich result with a thumbnail.
• BreadcrumbList Schema Generator Generate BreadcrumbList JSON-LD from your page path so Google shows a breadcrumb trail instead of a bare URL in the result.
• HowTo Schema Generator Generate HowTo JSON-LD — ordered steps with images, tools and total time — to mark up a tutorial for the step-by-step rich result.
• Course Schema Generator Generate Course JSON-LD — name, provider and offers — so an online course is eligible for the course rich result.
• Organization Schema Generator Generate Organization JSON-LD — name, logo, URL, contact points and sameAs social profiles — for the knowledge panel and brand entity.
• JSON-LD Validator & Linter Paste JSON-LD and validate it — JSON syntax, @context and @type, and the required fields for common schema.org types — before you ship it.
• Twitter / X Card & OG Generator Generate Twitter/X Card and Open Graph meta tags — summary or summary_large_image — with a live preview of how the link will unfurl.
• ads.txt Generator & Validator Build a valid ads.txt file line by line — domain, publisher ID, DIRECT/RESELLER and the certification authority ID — for AdSense and programmatic buyers.
• Tab Order Visualizer Paste HTML and see the keyboard tab order — the sequence focusable elements receive focus, with positive tabindex traps and skipped controls flagged.
• Image Alt Text Checker Check image alt text quality — paste HTML or a list — and catch empty, missing, filename-as-alt and redundant 'image of' alt, with a fix for each.
• ARIA Roles Reference & Validator Look up WAI-ARIA roles — required attributes, allowed children and the keyboard interaction each implies — and validate that a role is being used correctly. Searchable.
• srcset & sizes Generator Generate a responsive img srcset and sizes — width descriptors and breakpoints — plus the matching picture element with WebP/AVIF, so the browser loads the right image.
• Heading Structure (H1-H6) Checker Paste HTML and audit the heading outline — H1 to H6 — flagging multiple H1s, skipped levels and empty headings that hurt accessibility and SEO.
• Microdata to JSON-LD Converter Convert inline schema.org microdata (itemscope / itemprop) into clean JSON-LD — Google's preferred format — without re-authoring the markup.
• RSS and Atom Feed Viewer Paste RSS or Atom XML and read it as a clean list of articles — title, date, author and summary, with namespaces and CDATA handled. In your browser.
• ICS Calendar Viewer Open an .ics calendar file and read every event — summary, time, location, organizer and recurrence — as clean cards. Parsed in your browser.
• vCard (.vcf) Viewer Read a vCard .vcf contact file as clean cards — names, phones, emails, addresses and orgs across vCard 2.1, 3.0 and 4.0. Parsed in your browser.
• Cookie Viewer Paste a Set-Cookie header or document.cookie string and read each cookie — name, value and attributes like Secure, HttpOnly, SameSite and Expires. In your browser.
• Font Viewer Preview a TTF, OTF, WOFF or WOFF2 font in your browser — sample text at every size, a glyph grid and the embedded name and version metadata. Nothing uploaded.
• EML Email Viewer Open an .eml email file and read it cleanly — From, To, Subject, date, headers and the decoded text or HTML body, with attachments listed. In your browser.
• HTML Viewer Paste HTML and see it render live in a sandboxed preview as you type — format the markup, toggle scripts safely and open it in a new tab. In your browser.
• SVG Viewer Paste SVG markup or load a file to preview it safely as an image, read its size, viewBox and element count, and export a PNG at any scale. In your browser.
• SSL Checker Check any site's live SSL/TLS certificate — expiry, issuer, hostname match, full chain, SANs, key type and which TLS versions the server accepts. Instant, no signup.
• SSL Certificate Expiration Checker See exactly when a website's SSL certificate expires — days remaining, the precise expiry date, issue date and issuer, read live from the server. Catch outages before visitors do.
• TLS Version Checker Test which TLS versions a server supports — TLS 1.0, 1.1, 1.2 and 1.3 probed individually — plus the negotiated protocol. Find deprecated protocols to disable for security and PCI.
• SSL Certificate Chain Checker Inspect the live chain of trust a server sends — leaf, intermediate and root — and confirm it is complete and ordered. Catch the missing-intermediate bug that breaks mobile and APIs.
• SSL SAN Checker List every Subject Alternative Name on a live certificate — apex, www, subdomains and wildcards — and confirm a host is covered. Verify multi-domain and wildcard certificates.
• SSL Cipher Checker See the cipher a site negotiates live — cipher suite, strength in bits, key type and size, signature algorithm, forward secrecy and protocol support. Sanity-check modern crypto fast.
• WHOIS Lookup Look up any domain's live registration record — registrar, creation and expiry dates, name servers, status codes and the full raw WHOIS, read from the registry via WHOIS and RDAP.
• Domain Age Checker Check how old a domain is — the exact registry creation date and age in years and days, read live. Domain age is a real trust signal for fraud screening and SEO research.
• Domain Expiration Checker See exactly when a domain expires — the registry expiry date and days remaining, read live, so you can renew before the registration lapses and the site goes dark.
• RDAP Lookup Query a domain via RDAP, the structured JSON replacement for WHOIS — registrar, dates, status and name servers, plus the full raw RDAP response. Reliable, machine-readable data.
• Domain Registrar Lookup Find which registrar a domain is registered with — registrar name, IANA ID, WHOIS server, transfer-lock status and name servers. Answer "who do I contact to manage this domain?"
• HTTP Header Checker See the full HTTP response headers any URL returns — status, redirect chain, content type, caching, compression, cookies and security headers — read live from the server.
• HTTP Status Code Checker Check the exact HTTP status code a URL returns right now — 200, 301, 404, 500 — plus the full redirect chain, read live from the server.
• Redirect Checker Trace every redirect a URL passes through — each hop, its status code (301, 302, 307, 308) and the final destination — to find and collapse slow redirect chains.
• Security Headers Checker Scan a live URL for the HTTP security headers that protect visitors — HSTS, CSP, X-Frame-Options, X-Content-Type-Options and more — scored and explained.
• HSTS Checker Check whether a URL sends an HSTS header and read its policy — max-age, includeSubDomains and preload — to confirm HTTPS is enforced and downgrade-proof.
• Cache Header Checker Inspect how a URL is cached — Cache-Control, Expires, ETag, Last-Modified, Age and Vary — with a plain-English verdict on cacheability, read live.
• Content-Type Checker See the Content-Type a URL returns — the MIME type, the charset and whether nosniff is set — so you can fix wrong types and garbled encodings.
• Server Header Checker Identify the web server behind a URL — the Server and X-Powered-By headers, CDN hints and any version disclosure that fingerprints the stack.
• Gzip / Brotli Compression Checker Check whether a URL is served with gzip or Brotli compression — the Content-Encoding, the compressed vs uncompressed size and the percentage saved.
• Response Time Checker Measure how fast a URL responds and where the time goes — DNS, TCP, TLS, time-to-first-byte and download phases broken down visually.
• Page Size Checker Measure a page's HTML document size — the transfer size on the wire and the decompressed size, with the compression saving, read live.
• Mixed Content Checker Scan an HTTPS page for insecure http:// resources that break the padlock — scripts, styles, images and iframes loaded over http, with block-vs-warn severity.