SEO and Web Tools: Meta Tags, Schema, DNS, Robots.txt

301 Redirect Code Generator Generate 301, 302, 307 or 308 redirect code for Apache .htaccess, nginx, IIS web.config, Caddy, Netlify and Cloudflare, with an HTML fallback.

ads.txt Generator Turn your seller records into an ads.txt file in the IAB Tech Lab format: domain, account ID, DIRECT or RESELLER, and the CONTACT and owner variables.

Browser Info See what your browser tells websites: name and version, engine, OS, device type, languages, Do Not Track and Global Privacy Control. Read in your browser.

CIDR Block Merger Merge a list of IPv4 and IPv6 addresses and CIDR blocks into the fewest covering blocks, or turn one IP range into CIDR blocks, with counts.

CSP Generator and Checker Write a Content-Security-Policy header, see the rule that governs each kind of resource after fallback, and get warnings for sources that weaken the policy.

DMARC Record Generator Build a DMARC policy record with its p, sp, pct, rua, ruf, alignment and interval tags, the _dmarc name to publish it at, and what each tag does.

DNS Lookup Look up DNS records of any domain: A, AAAA, MX, TXT, NS, SOA, CAA and more, with TTLs and priorities. Queries go from your browser to Cloudflare or Google.

Download Time Calculator Work out how long a file takes to download or upload at a connection speed in Mbps or MB/s, with protocol overhead, or the speed needed for a target time.

Email Address Validator Check e-mail addresses, one per line, against RFC 5322 and RFC 5321 syntax: local part, domain, quoted strings, length limits, and the reason for each failure.

Email Header Analyzer Paste raw e-mail headers to see the Received hops in order with delays, the From, Return-Path and Reply-To checks, and the SPF, DKIM and DMARC results.

Hreflang Tag Generator Build hreflang tags, an XML sitemap with xhtml:link items and HTTP Link headers from language versions. Codes are checked against ISO 639-1 and 3166-1.

IP Address Converter Convert an IPv4 address such as 192.168.1.1 into binary, hexadecimal, octal and the single decimal number of its 32 bits.

IPv6 Address Converter Expand or compress an IPv6 address, find its type, its ip6.arpa reverse name, the network and range of a prefix length, and any IPv4 address it holds.

JSON-LD Schema Markup Generator Write valid JSON-LD structured data for 14 schema.org types. Each type shows the properties Google asks for, and the escaped script cannot break your page.

Keyword Density Checker Count how often each word and each two- or three-word phrase appears in your text, with its share of the words counted. Common words can be left out.

Mailto Link Generator Make a mailto link that opens a new e-mail with the recipients, copy, subject and message already filled in, encoded the way RFC 6068 asks.

Meta Tag Generator Create the head tags of a page: title, description, canonical link, robots rules, theme colour, and Open Graph and Twitter Card tags, with every value escaped.

Open Graph Preview Compose or paste Open Graph and Twitter tags, see six generic link cards, and copy the tags. Pictures stay on your device and are never uploaded.

PPI Calculator Find a screen's pixel density (PPI) from its resolution and diagonal in inches or cm, with its dot pitch, width and height, and common screens from Wikipedia.

Punycode Converter Convert a domain name with accents or non-Latin letters to its xn-- Punycode form, or decode an xn-- name to Unicode, label by label, as RFC 3492 describes.

Reverse DNS Lookup Find the host name behind an IPv4 or IPv6 address with a PTR lookup, then check that the name points back to it. Starts with your own IP address.

Robots.txt Generator Write a robots.txt file with allowed and disallowed paths, sitemap lines and a crawl delay, plus optional groups that block or allow AI crawlers such as GPTBot.

Robots.txt Tester Paste a robots.txt file, choose a crawler and a path, and see whether the rules allow it, with the line that decided. It follows RFC 9309 exactly.

Screen Resolution Checker Find your screen resolution in CSS and physical pixels, pixel ratio, colour depth, aspect ratio, HDR support and refresh rate. Measured in your browser.

Search Snippet Preview Type a title, an address and a description to see a desktop and a mobile search result. Cut-off points are measured in pixels and marked with an ellipsis.

Sitemap Validator Paste a sitemap or sitemap index in XML and check it against the sitemaps.org protocol: namespace, loc, lastmod, changefreq, priority and the size limits.

SPF and DMARC Checker Check a domain's SPF and DMARC records and its mail servers. Counts SPF's 10 DNS lookups, reads each DMARC tag and shows the size of a DKIM key.

SPF Record Generator Build an SPF record from your mail servers, networks and included domains. Counts the DNS lookups against the limit of 10 and splits long TXT strings.

Subnet Calculator Calculate an IPv4 or IPv6 subnet: network, broadcast, first and last host, usable hosts, masks, the address range and the subnets a split creates.

TV Viewing Distance Find the best distance to sit from a TV or screen by size and resolution, using the THX 40° and SMPTE 30° angles and pixel limit, or size for a distance.

URL Slug Generator Turn a list of titles into clean URL slugs in one go. Turkish, German and French letters are changed, and you choose the separator and the longest slug.

UTM Link Builder for Campaign URLs Add utm_source, utm_medium, utm_campaign and other campaign tags to one link or a list. Existing parameters and #fragments are kept and values are encoded.

Video File Size Calculator Estimate a video's file size from its video and audio bitrates and its duration, or find the video bitrate that fits a target size, in decimal MB or binary MiB.

Web App Manifest Generator Write a web app manifest with name, start URL, display mode, colours and icons, and see which checks for installing the app it still misses.

WebRTC Leak Test Check whether WebRTC shows your real public IP address while a VPN is on. The test asks public STUN servers only when you press the button.

What Is My IP Address See your public IP address, IPv4 or IPv6, with the approximate country, city and time zone it belongs to. Copy it in one click. This site does not store it.

WhatsApp Link Generator Build a wa.me link that opens a WhatsApp chat with a phone number and an optional message already typed in. Digits only, encoded the way WhatsApp asks.

XML Sitemap Generator Turn a list of URLs into an XML sitemap with escaped values, lastmod dates and a sitemap index when the list is over 50,000 URLs or 50 MB.

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