62 free tools · no sign-up
Online tools for admins and developers
Network diagnostics, DNS, SSL, website checks and everyday developer utilities — free and without sign-up.
01 / 6 tools
Network diagnostics
Reachability, routes, open ports and your own connection.
- Ping — server availability checkCheck whether a host responds and how fast, from our test nodes.
- Traceroute — route to a serverSee every hop between our node and the target with latency and loss.
- Internet speed testMeasure download, upload, ping and jitter of your connection.
- What is my IP and deviceYour public IP, provider, location, browser and device parameters.
- Proxy and IP anonymity checkFind out whether your connection goes through a proxy, VPN or Tor.
- Port checkerCheck whether a TCP port on a server is open and reachable from the internet.
02 / 11 tools
DNS & IP
Records, ownership, geolocation and address math.
- WHOIS and IP lookupRegistrar, dates, status and contacts of any domain, or the owner network of an IP.
- DNS lookupA, AAAA, MX, TXT, NS, CNAME, SOA and CAA records of a domain.
- Reverse DNS (rDNS) lookupFind the PTR record — the hostname behind an IP address.
- IP geolocationCountry, city, provider and network of an IP address.
- IP calculatorConvert an IP between decimal, hex and binary and check its type.
- Subnet calculatorNetwork, broadcast, mask, host range and count for any IPv4 or IPv6 CIDR.
- IP blacklist check (RBL)Check whether an IP is listed in popular DNS blacklists.
- Domain age checkerFind out when a domain was registered, how old it is and when it expires.
- ASN lookupFind the autonomous system of an IP address, or the details and prefixes of an AS number.
- DNS propagation checkerSee whether a DNS record has updated on public DNS servers in different countries.
- MAC address lookupFind the vendor of a network device by its MAC address.
03 / 4 tools
SSL / TLS
Inspect, decode and convert certificates and protocols.
- SSL certificate checkerValidity, issuer, chain and expiry of a website certificate.
- TLS and SSL protocol support checkWhich TLS versions and ciphers a server supports, and known weaknesses.
- SSL certificate decoderDecode a PEM certificate or CSR and see all its fields.
- SSL certificate converterConvert certificates between PEM, DER and PKCS#12 (PFX) online.
04 / 5 tools
Email & deliverability
Mail records and authentication: SPF, DKIM, DMARC.
- SPF checkerCheck the SPF record of a domain: syntax, the DNS lookup limit and every include.
- DKIM checkerFind the DKIM keys of a domain by selector and check the key type and length.
- DMARC checkerLook up the DMARC policy of a domain and see what each tag means.
- MX lookupSee the mail servers of a domain with their priority, IP addresses and PTR records.
- Email header analyzerPaste the headers of an email to see its route, delays and SPF, DKIM and DMARC results.
05 / 10 tools
Website analysis
Headers, redirects, SEO, speed and what a page loads.
- HTTP headers checkerResponse status and all HTTP headers a page returns.
- URL redirect checkerFollow every redirect hop with its status code and target.
- CDN provider detectionFind out which CDN or proxy serves a website.
- Website SEO analysisTitle, description, headings, canonical, robots, sitemap and other on-page checks.
- Meta tags previewSee how a page looks in Google, Facebook, X and Telegram previews.
- Mobile-friendliness testCheck how a page works on phones: viewport, tap targets, font sizes.
- Page load speed testCore Web Vitals and load metrics of a page with improvement tips.
- JavaScript tracker checkWhich analytics, ad and tracking scripts a website loads.
- Robots.txt testerCheck whether robots.txt lets Googlebot and other crawlers open a URL.
- Sitemap validatorValidate an XML sitemap: structure, URLs, dates and nested sitemaps.
06 / 2 tools
Security
Password leak check and what your browser tells websites.
07 / 18 tools
Generators
Passwords, keys, hashes, IDs and server configs.
- Strong password generatorRandom passwords with the length and characters you choose.
- UUID generator v1, v4 and v5Generate one or many UUIDs of version 1, 4 or 5.
- SSH key generatorCreate an Ed25519 or RSA key pair in OpenSSH format. Keys are never stored.
- .htpasswd generatorMake .htpasswd lines with bcrypt, APR1-MD5 or SHA-1 hashes.
- Random string generatorRandom strings of any length from the character set you need.
- Random number generatorRandom integers or decimals in any range, with or without repeats.
- MAC address generatorRandom MAC addresses for VMs and tests, or inside the IEEE blocks of a vendor.
- Unix timestamp converterConvert Unix time to a date and back, in any time zone.
- Hash generator MD5, SHA-1, SHA-256Hashes of text or a file: MD5, SHA-1, SHA-256, SHA-384 and SHA-512.
- GPG key generatorCreate an OpenPGP key pair for signing and encryption. Keys are never stored.
- Checksum calculator CRC32, Adler-32CRC32 and Adler-32 checksums of text or a file.
- .htaccess generatorBuild .htaccess rules: redirects, HTTPS, www, caching, gzip and access.
- chmod calculatorConvert Linux file permissions between numbers and rwx and get the chmod command.
- RAID calculatorUsable space, protection and unused space for SHR and RAID 0, 1, 5, 6 and 10 with disks of any size.
- Cron expression generatorBuild a cron expression, read it in plain words and see the next run times.
- Meta tag generatorGenerate the title, description, Open Graph and Twitter tags of a page.
- Robots.txt generatorBuild a robots.txt file with rules for search engines and AI crawlers.
- Sitemap generatorCrawl a website and get a ready XML sitemap.
08 / 6 tools
Developer utilities
Format, validate, minify and convert.
- JSON validator and formatterValidate, format or minify JSON and see exactly where an error is.
- XML validator and formatterValidate, format or minify XML.
- CSS, JS and HTML minifierMinify CSS, JavaScript and HTML and see how much you saved.
- Markdown to HTML converterConvert Markdown to clean HTML with a live preview.
- JWT decoderDecode a JSON Web Token, check its expiry and verify the signature.
- YAML validatorCheck YAML syntax, find the line with an error and convert YAML to JSON.
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