All tools
28 free tools for domains, email security, TLS, HTTP, networks and everyday developer work. Filter by category or search by name.
28 tools
Domain
- Domain HealthOne check for DNS, email authentication, TLS, security headers and redirects, with a grade per area and a full report.
- DNS LookupLook up DNS records by type, including reverse (PTR) lookups for IP addresses.
- WHOIS LookupSee who registered a domain, when it expires and which name servers it uses.
- Email SecurityCheck SPF, DKIM, DMARC, MTA-STS, TLS-RPT and BIMI for a domain and get the records to fix them.
- MX & SMTPCheck a domain's mail servers and test SMTP connections, STARTTLS and open relay.
- Blacklist CheckerCheck whether an IP address or a domain's mail server is listed on DNS blocklists.
- Email Header AnalyzerTrace delivery hops and read SPF, DKIM and DMARC results from raw email headers.
- Record BuildersBuild SPF and DMARC records, meta tags and robots.txt with live checks as you type.
TLS
HTTP
- HTTP HeadersGrade a site's security headers and cookies and get the header lines to add.
- Redirect CheckerTrace redirects from http and https, with and without www, to the final URL and spot loops and extra hops.
- SEO MetadataCheck a page's title, description, canonical, robots and Open Graph tags.
- Request InspectorParse a User-Agent string into browser, operating system, device and bot.
Network
- Ping & TraceroutePing a public host for loss and latency, or trace the route to it hop by hop.
- IP IntelligenceLook up an IP address's network, ASN, reverse DNS and approximate location, or show your own.
- Port ScannerCheck which common TCP ports on a public host accept connections, with a full exposure report.
Developer
- JSON ToolsFormat, minify and validate JSON with exact error positions, and convert CSV to JSON.
- Code FormatterFormat and minify XML, HTML, CSS and JavaScript in your browser.
- Encoder / DecoderEncode and decode Base64, URLs and HTML entities, and convert number bases.
- URL & UTMSplit a URL into its parts and build campaign links with UTM parameters.
- Text UtilitiesCount words and characters, change case and turn titles into URL slugs.
- JWT DecoderDecode JWT header and claims and verify HS, RS, PS and ES signatures in your browser.
- Regex TesterTest JavaScript regular expressions with highlighted matches, capture groups and replace.
- Hash GeneratorHash text with MD5, SHA-1, SHA-256, SHA-384, SHA-512 or HMAC.
- Password GeneratorGenerate strong random passwords in your browser with an entropy estimate.
- UUID GeneratorGenerate UUID v4, UUID v7 and ULID identifiers and decode existing UUIDs.
- Timestamp ConverterConvert Unix timestamps and dates across formats and time zones.
- Color ConverterConvert HEX, RGB, HSL and OKLCH colours and check WCAG contrast.