148 free of charge SEO tools For your website

Creates an HTML sitemap for visitors from XML or URL lists. Edit link texts, exclude pages and export finished HTML.

Creates XML image sitemaps from page and image URLs. Groups images per page and removes duplicate assignments – locally in the browser.

Compare two sitemap states: new, removed and modified URLs with lastmod and other metadata. With file import, filters and CSV export.

Test inserted robots.txt rules against specific URLs and show the decisive Allow or Disallow rule with row number.

Creates clean meta-robot tags for index, noindex, follow, nofollow and other robots directives – including preview and copy & paste code.

Checks a URL for status code, redirects, canonical, meta robots, X-Robots tag, title, H1, hreflang, and technical indexability.

Checks existing sitemaps for error-freeness and lists contained URLs incl. Last-modified.

Creates a clean sitemap.xml from a URL list – including preview, download and optional lastmod, changefreq and priority.

Creates a clean robots.txt with user-agent, Allow, Disallow and optional sitemap entry – including preview, copy and download.

Checks Robots.txt files for accessibility, syntax, rules, locks and hints on sitemaps.

Checks meta-robots and X-robots signals for index, noindex, follow, nofollow and other crawler clues.

Check if a page is technically indexable – including status code, canonical, robot signals and HTML basics.

Creates clean rel="canonical" tags for pages, variant URLs and duplicate content scenarios – including preview and copy.

Check canonical tags, redirects, and destination URLs – to find conflicting signals on tracking parameters or URL variants.

Check up to 50 Sitemap entries for final status, Meta Robots and Canonical. The sample helps with targeted sitemap corrections.

Creates XML video sitemaps from video pages, thumbnails and player URLs – with form, CSV import and download.

Creates news sitemaps for current articles, checks publication dates, and displays older, omitted entries.

Check RSS and Atom for XML errors, duplicate entries, dates and accessible article links.

Compare before and after: Find newly blocked or shared URLs from lists and sitemaps.

Read the final server response with fixed retrieval options and explain important HTTP headers right next to the values. With copying and CSV export.

Checks HTTP status codes for URL, URL list or sitemap and shows 200 OK, 301/302, 404/410, 5xx and final destination URL.

Compares HTTP responses for two user agents and header profiles: status, destination URL, SEO specifications, selected headers, and static content.

Simulates Apache and Nginx forwards with sample URLs. Shows rule overlaps, query parameters, chains and loops.

Check error pages with HTTP 200 against Title, H1, content, and an optional comparison error page. Shows concrete evidence of the suspicion.

Creates a clean redirect map for relaunches and migrations – as CSV and for Apache or Nginx redirects.

Checks redirect chains (301/302/307/308), final destination URL, www/non-www & HTTP→HTTPS, detects loops and (optional) canonical conflicts.

Checks HTTPS forwarding, certificate, and HSTS – to detect incorrect destination URLs or certificate issues after an HTTPS changeover.

Check whether www and non-www forward to a preferred target version – without double accessibility and without unnecessary redirect detours.

Creates clean hreflang tags for international setups with language/country codes, x-default and copy-and-paste-ready markup.

Checks language codes, references and canonical conflicts – to find errors in the hreflang linking of international sites.

Checks up to 50 entered URLs via HEAD: final status, destination URL and number of redirects for a fixed checklist.

Create HTTPS, host variant, GZIP, caching, and error page as Apache rules.

Locally encode or decode URLs and individual parameters; check duplicate encoding and plus signs.

Locally encode HTML special characters or decode them once; copy the result and save it as text.

Which CMS uses a website? Recognize WordPress, TYPO3, Shopify and other systems based on public HTML signals. Free of charge with specific references.

Check website accessibility for free: HTTP status, forwardings, destination address and response time from the Seitenreport server. Without registration.

Check domain age and WHOIS data for free: age from the registration date, registrar, status and nameserver. With source and clear boundaries in the case of missing data.

Validate JSON for free, format readable or minimize it. With syntax errors, warning on duplicate keys and receiving large numbers. Locally in the browser.

Check XML for well-formedness free of charge and format readably. With namespace support, mixed content protection, and local file upload.

Check Reverse DNS for free: Resolve IPv4 or IPv6 in PTR hostnames and compare them to the forward resolution. With clear error assignment.

Check CORS for free: Compare Origin, Credentials, desired method and header with GET and OPTIONS responses. Without transmitting access data.

Convert IDN domains into Punycode for free and decode them readably. Up to 100 domains, Unicode and ASCII output, completely local in the browser.

Validate and format YAML for free. Check syntax errors, duplicate keys, multiple documents and anchors. File import locally in the browser.

Convert JSON to CSV and CSV to JSON for free. With separator selection, column selection, exact large numbers and local file import.

Convert XML and JSON for free. With attributes, namespaces, repeated elements, and an ordered model for mixed content. Locally in the browser.

Code or decode text and files for free as Base64. UTF-8, Base64URL and Data URIs, with binary download and no upload.

Test RegEx for free: Hits, positions, groups and replacements with JavaScript RegExp. With flags, time limit and local export.

Compares titles and descriptions of up to 50 URLs or 1,000 CSV lines. Finds missing and duplicate information and exports the correction list.

Created from your logo Favicons, Apple Touch Icon and Android icons as ZIP with HTML integration. Processing directly in the browser.

Creates clean open graph tags for social previews: og:title, og:description, og:image, og:url and optionally Twitter Cards.

Creates clean title, description, robots, canonical, open graph, and Twitter tags for SEO, social preview, and copy & paste-ready head code.

Creates JSON-LD with preview and copy function – to mark articles, products or FAQ pages with structured data.

Edit title and description and simulate it as a Google snippet on desktop and mobile devices. Optionally transfer existing information from a URL.

Check Title, Description, Robots, Canonical, Open Graph, Twitter Cards, hreflang, charset and viewport of a URL.

Check Open Graph and Twitter Cards – if shared links show a wrong image, a wrong title or no matching preview.

Checks files and integration of favicons and Apple Touch icons – if website icons are missing or displayed incorrectly.

Checks JSON-LD, Microdata and RDFa and compares schema information with HTML content: name, prices, availability, author, date and address.

Creates FAQPage-JSON-LD from visible questions and answers, with built-in aid. Google no longer shows FAQ-Rich results.

Check video embedding, VideoObject and accessible thumbnail images; detect technical hurdles.

Compare up to six variants on product data, canonicals, group IDs and HTML pre-selection.

Compares sitemap URLs to a crawl of internal links. Shows undiscovered candidates, source pages, and actual crawl coverage.

Checks known source pages for links to your domain or URL and shows link text, rel attributes and HTTP status. Up to five sources per run.

Check internal linking of a URL: internal/external links, anchor texts, nofollow and status codes of the landing pages.

Find defective links on a URL: check internal and external links, detect 404/5xx and make redirect destinations visible.

Creates clean SEO-friendly URL slugs from titles or headlines – readable, consistent and directly usable for talking URLs.

Shows the website structure from a sitemap as a directory tree. Optionally examine internal links and observed click depths.

Find missing jump targets and duplicate IDs with link text and HTML line.

Compare visible breadcrumbs with structured paths and check destination addresses.

Checks the certificate of your domain, issuer and expiration date – even if the domain redirects to another website.

Checks key security headers such as HSTS, CSP, X-Frame Options, Referrer Policy and other security headers of a URL.

Checks domain and IP against DNSBL/RHSBL lists and complements mail DNS. Helps to classify list hits and the reference to the actual shipping IP.

Determines the IPv4 and IPv6 addresses of a website, domain or URL. Ideal for DNS, hosting, CDN and infrastructure checks.

Checks A, AAAA, CNAME, MX, NS, TXT, SOA, CAA and recognized SPF and DMARC guidelines of a domain.

Find HTTP resources and insecure form targets in HTTPS pages and CSS.

Check Google Fonts for free: detect external style sheets, CSS imports, font files and connection instructions with references. Without registration.

Check SPF record for free: evaluate TXT entry, IP networks, include, redirect, recursion errors and DNS mechanisms. With comprehensible instructions.

Check DKIM for free: query domain and selector, evaluate public key, RSA key length, Ed25519 and revoked keys. Without test mail.

Check and create DMARC record free of charge: Policy, subdomain inheritance, SPF/DKIM alignment and track reporting address. With DNS generator.

Create CSP for free and test resource URLs against a policy. With directives fallbacks, several policies, report-only and clear test limits.

Generate domain names for free: from terms, industry and location. With endings, length filters, hyphens, umlauts, favorites and export. Without registration.

Check hosting hints of a domain for free: separately classify IP addresses, network operators, ASN, name servers and recognizable CDN infrastructure.

Compare DNS changes for free on Google Public DNS and Cloudflare. With records, TTLs, NXDOMAIN and transparent classification of deviations.

Compare DNS records for free before and after a move. Capture snapshots, import them locally and detect new, removed or unchanged records.

View domain history for free based on Internet archive recordings. With a time overview, direct archive links and a clear demarcation to the domain age.

Connects up to four keyword lists, removes duplicates and exports up to 10,000 combinations as TXT or CSV.

Analyze your CSV export locally: find ranking opportunities, noticeable CTR and click losses, optionally compare with a second period.

Creates filters from search terms or URL parts and tests suitable lines – for brand variants, non-brand evaluations and directories.

Expands seed keywords with longtails, questions, search intentions, search volume and SERP features.

Shows organic ranking keywords of a domain with position, ranking URL, search volume, intent and quick-win opportunities.

Determines organic Google competitors based on common keywords, top 10 coverage and estimated visibility gaps.

Check URL and keywords: Main keyword and minor keywords in Title, Description, URL, H1, Headings and Text.

Calculates keyword frequency and density in URLs or texts – to check the distribution of keywords and phrases including references.

Generates keyword ideas from fixed question beginnings and additions. Sift proposals and export them as CSV; without measured demand.

Checks Google positions for multiple keywords and shows the target URLs found – to see which page ranks for which search term.

Groups your own keyword lists and CSV files. Edit groups, assign landing pages and summarize existing key figures.

Compare terms and weightings of your own text with 3-10 self-chosen references.

Convert Google rating link to a static QR code as PNG or SVG.

Calculate three CTR scenarios with additional clicks, conversions, costs and contribution margin.

Checks H1–H6, header hierarchy, missing or duplicate H1, blank headers, and typical structural problems.

Marks added and removed words or lines between two text versions. With TXT import and change report, completely local.

Analyses German texts with Flesch and LIX, marks long sentences and compares the revision with the initial status. Locally in the browser.

Removes unnecessary code from static SVG graphics. Compare the original and result together with the file size and download it locally.

Compresses PNG, JPG and WebP locally in the browser. Set image width and quality, compare sizes and download files individually or as ZIP.

Creates blind text for website designs and layouts. Select paragraphs, sentences or an exact number of words and adopt them as text or HTML.

Compare two texts or URLs using common four-word sequences. With similarity value and phrases; no plagiarism search throughout the web.

Checks images for alt texts, filenames, dimensions, lazy loading, and weight notes.

Counts words and characters directly in the inserted text, without uploading. Optionally check the text scope of a published URL.

Check images of a URL for missing, empty or weak alt texts – helpful for SEO, accessibility and content QA.

Checks word count, text structure, readability approximation, and exact focus phrases in text or URL. Transparent key figures without a blanket quality rating.

Compares two websites: metadata, headings, main text, links and schema types – with target keyword and CSV export.

Check product feeds for missing information, duplicate IDs, pricing formats and identifiers.

Create an author briefing from target group, search intention, questions and internal links and save it as a markdown.

Check PDF for free for title, readable text, links and file size. With PDF URL additionally evaluate HTTP status and X-Robots tag. Without registration.

Checks robots.txt and live calls for AI search and AI crawlers such as Googlebot, OAI SearchBot, GPTBot, Claude and Perplexity.

Examines names, form labels, links, buttons, and statuses in HTML. Static screening with references and concrete indications.

Checks HTML, Googlebot access, snippet rules, and canonical of a URL. Concrete evidence and next steps instead of an invented visibility score.

Compare AI impressions from the appropriate Search Console report. Shows changes per page, country or device with transparent export borders.

Evaluates GA4 and Matomo CSV locally: detected AI referrers, sessions, entry pages, and changes between two time periods.

Compares names, contacts, profile links and pricing from up to five separate pages. With references, context and optional benchmarks.

Extracts main content, headings, tables, and source links from HTML or a URL. Download Markdown and text locally.

Creates an optional llms.txt link overview for supporting services. Not required for Google and without ranking effect.

Measure time to first byte, redirects, HTTP version and total HTML time of a URL.

Technical pre-checking of resource, JavaScript and layout signals. No measured LCP, INP or CLS values.

Pre-check LCP risks based on server response, resources and image priority. The actual LCP is not measured.

Pre-check JavaScript and third parties as interaction risks. No browser interactions or measured INP values.

Pre-check missing image and iframe dimensions as layout risks. Actual shifts and CLS are not measured.

Identify blocking stylesheets and synchronous scripts that brake First Paint and LCP.

External scripts, inline blocks, known JS sizes and Async/Defer signals.

Check image weight, lazy loading, image dimensions and prioritization of hero images.

Evaluate cache control, expires, content encoding and asset caching signals.

Make external hosts, tracking tags, widgets and third-party scripts visible.

Test conditional HTTP requests and rank ETag, Last-Modified and real 304 responses.

Check web font performance for free: Evaluate font families, sections, font display, source files, sizes and preloads in static HTML/CSS.

Check HTTP/2 and HTTP/3 for free: distinguish negotiated protocol and alt-Svc. With clear indications about QUIC and measurement limits.

Minimize or format CSS for free. Parser-assisted processing, syntax hints and receipt of license comments. Local without file upload.

Minimize or format JavaScript for free. With syntax checking, module mode and obtaining variable names and license comments. Locally in the browser.

Technical pre-testing of several WCAG/BITV-oriented signals via sitemap URLs.

Calculate WCAG contrast ratio for text and background colors.

Find images without alt attributes and display specific selectors.

Recognize input, select and textarea fields without accessible names.

H1, technically consider heading hierarchy and main landmark.

Find empty or non-specific link texts such as “more” and “here” via sitemap URLs.

Check tabindex risks, missing skip links and focusable aria-hidden elements.

Detect duplicate IDs, missing ARIA targets, unknown roles, and iframe-title issues.

Check HTML-long, language code and document titles as common SEO and accessibility signals.

Check labels, button names and autocomplete notes for lead and checkout forms.

Structuring preparation, prioritization and next steps for website accessibility.

Mobile HTML/CSS preview with indications of overwidth, small texts and controls.