A growing toolbox of fast, free, no-signup utilities — from DNS and SSL checks to formatters and converters. Built by the team behind Uptimeify.
70 tools
WHOIS, registration and domain age insights.
Record lookups, propagation and reverse DNS.
Query A, AAAA, MX, TXT, NS and more for any hostname.
Check how a DNS change has propagated across global resolvers.
Resolve an IP address back to its PTR hostname.
Full DNS record sweep and health check for a domain.
Check the mail servers (MX records) for a domain.
Inspect the SOA record and serial of a DNS zone.
Ping, ports, routing and everyday ops checks.
Measure reachability and latency to any host from our locations.
Test whether a TCP port is open and reachable on a host.
Test whether a WebSocket endpoint is reachable.
Check whether an IP is listed on major email blacklists.
Headers, parsing and request inspection.
Inspect response headers, status and redirects for any URL.
Break a user-agent string down into browser, OS and device.
Decode and inspect a JSON Web Token header and payload.
Trace the full 301/302 redirect chain of a URL.
Verify certificates, emails and inputs.
Validate certificate chain, expiry and hostname for any site.
Check syntax, MX records and deliverability signals for an address.
Test regular expressions and inspect capture groups live.
Validate YAML syntax and catch indentation errors.
Check JavaScript for syntax errors.
Query JSON with JSONPath expressions.
Evaluate XPath expressions against XML.
Check a site's HTTP Strict Transport Security header.
Check clickjacking protection (X-Frame-Options / CSP).
Audit cookie Secure, HttpOnly and SameSite flags.
Validate a domain's SPF record for email deliverability.
Check a domain's DKIM signature record.
Analyze a domain's DMARC policy and alignment.
Beautify and minify code and data.
Beautify, minify and validate JSON in your browser.
Format and prettify SQL queries for readability.
Beautify or minify XML markup.
Beautify and tidy HTML markup.
Minify JavaScript to shrink file size.
Minify CSS to reduce payload size.
Compress JSON down to a single line and see the savings.
Minify HTML markup to reduce page weight.
IP, hosting and infrastructure intel.
Audit, count and analyze page content.
Audit title, description, Open Graph and Twitter card tags.
Count words, characters and estimated reading time.
Check whether a word or phrase appears on any web page — instantly.
Measure the download size of any web page — wire and decoded.
Handy everyday utilities.
Convert an SLA uptime target into allowed downtime per day, month and year.
Generate strong, random passwords with configurable rules.
Generate a PGP key pair right in your browser.
See how much downtime budget is left this month.
Estimate hosting bandwidth from traffic and page size.
Estimate download time from file size and connection speed.
Convert between formats, time and encodings.
Convert between Unix time and human-readable dates, both ways.
Encode and decode Base64 strings instantly (UTF-8 & URL-safe).
Build a crontab schedule, read it in plain English and preview the next runs.
Percent-encode and decode URLs and query strings.
Escape and unescape HTML entities.
Escape and unescape JavaScript string literals.
Escape and unescape XML strings.
Convert between YAML and JSON in both directions.
Convert CSV to JSON, XML, YAML or SQL.
Generate TypeScript, Go, Python or JSON Schema types from JSON.
Convert IPv4 between dotted, integer, hex and binary notation.
Compress and expand IPv6 addresses (RFC 5952).
Convert between bytes, KB, MB, GB, TB and more (decimal & binary).
Analyze thread and goroutine dumps.
HTTP status codes and reachability checks.
Explain any HTTP status code and what it means.
Is it down for everyone, or just you? Check a site from our network.
Check a site over both HTTP and HTTPS and see if it upgrades to HTTPS.
Measure how fast any URL responds, with min/avg/max.
Tell us what would make your day easier — we build the tools our users ask for.
