Free tools for domains, hosting and the web

DNS History Checker

Check the historical DNS records and past IP addresses of a domain name.

DNS Lookup

Query A, AAAA, MX, TXT, NS, SOA, CNAME, SRV and CAA records for any domain.

DNS Propagation Checker

Ask twelve public resolvers worldwide whether your DNS change has landed.

DNS TTL Calculator

Calculate and convert DNS Time-To-Live (TTL) values from seconds to human-readable format.

DNS Zone File Generator

Generate a standard BIND-compatible DNS zone file from scratch.

DNS Zone Validator

Validate BIND DNS zone file syntax and check for missing records.

DNSSEC Checker

Verify DNSSEC signatures, DS records, and DNSKEYs for a domain.

Domain Age Checker

Find out exactly when a domain name was registered and how old it is.

Domain Availability Checker

Check whether a domain is available, across several TLDs at once.

Domain to IP Converter

Instantly resolve any domain name to its underlying IP addresses.

Nameserver (NS) Lookup

Instantly find the authoritative nameservers for any domain.

Punycode Converter

Convert Internationalized Domain Names (IDNs) between Unicode and Punycode.

Reverse DNS Lookup

Perform a Reverse DNS (rDNS) / PTR record lookup on any IP address.

Subdomain Finder

Discover subdomains for any domain using Certificate Transparency logs.

WHOIS Lookup

Look up registration, expiry, registrar, nameservers and status for any domain.

ASN Lookup & Prefix List

Lookup Autonomous System Numbers (ASN), IP prefixes, and network ownership details.

CIDR Calculator

Convert between CIDR notation and IP ranges, in either direction.

HTTP Header Checker

See every response header, the full redirect chain, and where the time goes.

HTTP Status Code Reference

Lookup and instantly explain any HTTP response status code.

IP Converter

Convert IP addresses between decimal, binary, hex, and dotted-decimal formats.

IP Address Lookup

Find the country, network owner and reverse DNS for any IP address.

IPv6 Subnet Calculator

Calculate IPv6 subnets, network prefixes, and address ranges.

MAC Address Lookup

Find the vendor and manufacturer of any MAC address or OUI.

Ping Test

Ping an IP address or hostname from multiple global locations.

Open Port Checker

See which TCP ports on a server are reachable from the internet.

Redirect Checker

Trace every hop a URL redirects through, with status codes and timings.

Subnet Calculator

Work out network address, broadcast, usable host range and mask from any CIDR.

Online Traceroute

Trace the route packets take across the internet to reach your destination host.

Website Down Checker

Check if a website is down for everyone or just you.

What Is My IP

See your public IP address, network operator and what your browser reveals.

SSL Certificate Decoder

Decode a PEM certificate or full chain and read every field in plain terms.

Cipher Suite Lookup

Search and decode TLS/SSL cipher suites to understand their security properties.

CSR Decoder

Decode a certificate signing request and check it before you submit it.

CSR Generator

Generate a certificate signing request and private key for any domain.

Mixed Content Checker

Scan a webpage for insecure HTTP resources loaded over HTTPS.

Self-Signed Certificate Generator

Generate a free self-signed SSL certificate for testing or local development.

SSL Chain Checker

Verify the full certificate chain and check for missing intermediate certificates.

SSL Certificate Checker

Check any site's certificate: expiry, issuer, hostname coverage and chain.

SSL Converter

Convert SSL certificates between PEM, DER, P7B, and PFX formats.

SSL Expiry Monitor

Check exactly how many days are left until an SSL certificate expires.

SSL Key Matcher

Check if a private key, SSL certificate, and CSR all match.

TLS Version Checker

Check which TLS protocols (1.0, 1.1, 1.2, 1.3) a server supports.

Autodiscover Checker

Test Exchange and email Autodiscover DNS records for automatic client configuration.

BIMI Record Checker

Verify your Brand Indicators for Message Identification (BIMI) DNS record and SVG logo.

Email Blacklist Checker

Check if your mail server IP or domain is listed on major DNSBL anti-spam blacklists.

Disposable Email Checker

Detect if an email address belongs to a temporary or disposable email provider.

DKIM Checker

Find and validate your DKIM public key, with automatic selector discovery.

DKIM Key Generator

Generate DKIM private and public keys along with the DNS TXT record.

DMARC Checker

Look up and validate your DMARC record, and see what it actually protects.

DMARC Generator

Build a DMARC record and know exactly what it will and will not block.

DMARC Report Parser

Parse and visualize XML DMARC aggregate reports into readable data.

Email Header Analyzer

Trace an email's path, time each hop, and read its SPF/DKIM verdicts.

Email Address Validator

Validate email syntax and verify if the receiving mail server actually exists.

MTA-STS Checker

Check your MTA-STS policy and DNS record to ensure secure email transport.

MX Lookup

Find where a domain's email is delivered, with priorities and provider detection.

SPF Checker

Validate your SPF record and count DNS lookups against the 10-lookup limit.

SPF Generator

Build a valid SPF record and see its DNS lookup cost before you publish it.

Broken Link Checker

Scan a webpage to find broken outbound links and 404 errors.

Canonical URL Checker

Check rel="canonical" tags across pages to ensure proper SEO indexation.

CDN & WAF Detector

Identify which Content Delivery Network or Web Application Firewall a site uses.

CMS Detector

Detect if a website is using WordPress, Shopify, Wix, or another CMS.

Core Web Vitals Test

Measure LCP, FID, and CLS performance metrics using Google PageSpeed Insights.

Hreflang Checker

Verify hreflang tags for multi-language websites to ensure proper SEO targeting.

Keyword Density Analyzer

Extract and analyze the most frequently used words on any webpage.

Meta Tag Analyzer

Check a page's title, description, headings, canonical and social tags.

Meta Tag Generator

Generate title, description, canonical, Open Graph and Twitter tags.

Open Graph Checker

See how a link will look when shared on social media and chat apps.

Page Size Checker

Calculate the exact total byte size of a web page and all its assets.

robots.txt Generator

Build a robots.txt file, including rules for AI training crawlers.

Robots.txt Tester

Fetch and analyze the robots.txt file for any website to verify SEO crawlability.

Robots.txt vs Noindex Checker

Test if a URL is blocked by robots.txt or has a meta noindex tag preventing crawling.

Schema Markup Generator

Generate rich snippets JSON-LD schema markup for your website.

Schema Markup Validator

Test your JSON-LD and Microdata structured data for SEO errors.

Google SERP Preview

Preview how your webpage title and description will look in Google search results.

XML Sitemap Generator

Crawl a website and generate a Google-compliant XML sitemap.

XML Sitemap Validator

Validate your sitemap.xml against the official schema and check for broken URLs.

Tech Stack Detector

Identify the CMS, frameworks, and technologies powering any website.

Website Change Monitor

Check the last modified date of a web page and track HTTP content changes.

Website Speed Test

Break a page's response time into DNS, connect, TLS and TTFB.

Bcrypt Generator & Verifier

Hash a password with bcrypt or Argon2, or check one against a hash.

Clickjacking Tester

Test if your website is vulnerable to clickjacking by attempting to iframe it.

Content Security Policy (CSP) Generator

Generate strict CSP headers to protect your website from XSS attacks.

Directory Listing Checker

Scan your web server to see if index/directory listing is exposed.

Exposed Files Checker

Scan a server for publicly accessible .env, .git, and backup files.

Fail2Ban Filter Generator

Generate custom Fail2Ban jail and filter configurations with Regex patterns.

HSTS Checker

Verify HTTP Strict Transport Security (HSTS) headers and preload status.

.htpasswd Generator

Create Apache basic-auth credentials in bcrypt, APR1 or SHA-1.

ModSecurity Rule Generator

Write custom ModSecurity WAF rules to block malicious traffic patterns.

Password Generator

Generate strong random passwords or memorable passphrases.

Password Strength Checker

Test the entropy and brute-force resistance of your passwords.

Pwned Password Checker

Check if a password has been exposed in a data breach (using secure k-anonymity).

Security Headers Checker

Grade any site's HTTP security headers and see exactly what to add.

SSH Key Pair Generator

Generate secure RSA or Ed25519 SSH keys for server authentication.

TOTP Generator

Generate Time-based One-Time Passwords (2FA codes) from a secret key.

WordPress Salt Generator

Generate the eight security keys and salts for wp-config.php.

WordPress Vulnerability Checker

Scan your WordPress site for known vulnerabilities in core, plugins, and themes.

Apache VirtualHost Generator

Instantly generate secure Apache VirtualHost configurations.

Backup Script Generator

Create bash scripts to automate database and file backups via cron.

Charset Migration Tool

Generate SQL queries to migrate MySQL databases from utf8 to utf8mb4.

Cron Expression Generator

Build a cron schedule from dropdowns and preview the next runs.

Cron Expression Parser

Translate a cron expression into plain English and see its next run times.

Dockerfile Generator

Generate Dockerfiles for Node.js, PHP, Python, and Go applications.

chmod Calculator

Convert between 755, rwxr-xr-x and symbolic chmod notation.

Firewall Rule Generator

Generate iptables or UFW firewall rules for your Linux server easily.

.htaccess Generator

Build an .htaccess file for redirects, HTTPS, caching and security.

.htaccess to Nginx Converter

Convert common Apache .htaccess rewrite rules into Nginx configuration syntax.

MySQL Configuration Tuner

Generate an optimized MySQL/MariaDB my.cnf file based on your server RAM.

MySQL Connection Tester

Test remote MySQL database connections and firewall port openings.

Nginx Config Generator

Build an nginx server block for PHP, WordPress, Laravel, SPAs or a proxy.

PHP.ini Generator

Generate optimized php.ini configurations based on server RAM and workload.

301 Redirect Generator

Generate exact 301 redirect code for Apache, Nginx, and PHP.

Server Requirements Checker

Check if a server configuration meets requirements for popular CMS apps.

SQL Dump Analyzer

Analyze large SQL dump files to see table sizes and row counts without importing.

wp-config.php Generator

Generate secure WordPress wp-config.php files with custom salts and prefixes.

Base64 Encode / Decode

Encode text to Base64 or decode it back, including URL-safe Base64.

Case Converter

Convert text to camelCase, snake_case, kebab-case, Title Case and more.

Color Converter

Convert HEX, RGB and HSL, with contrast ratios and a palette.

WCAG Color Contrast Checker

Calculate the contrast ratio between text and background colors for web accessibility.

CORS Tester

Test Cross-Origin Resource Sharing (CORS) headers for API endpoints.

CSS Minifier

Compress and minify CSS code to reduce file size and improve page speed.

CSV to Excel Converter

Convert raw CSV data into a downloadable Excel (XLSX) spreadsheet.

CSV to JSON Converter

Convert CSV tables into structured JSON arrays.

Text Diff Checker

Compare two blocks of text and see exactly what changed.

ENV to JSON Converter

Convert .env file contents into a standard JSON key-value object.

Gzip Compression Tester

Check if a website has Gzip or Brotli compression enabled.

Hash Generator

Generate MD5, SHA-1, SHA-256, SHA-512, SHA-3 and CRC32 hashes at once.

Hash Identifier

Identify the algorithm (MD5, SHA1, bcrypt, etc.) used to generate a hash.

HMAC Generator

Generate secure HMAC signatures using MD5, SHA256, SHA512, and more.

HTML Encode / Decode

Safely escape HTML entities or decode them back to raw characters.

HTML Formatter

Beautify and format messy or minified HTML code with proper indentation.

JavaScript Minifier

Compress and minify JavaScript code to reduce file size and improve page speed.

JSON Formatter

Format, validate and minify JSON with precise error locations.

JSON to CSV Converter

Convert JSON arrays or objects into flat CSV tables.

JSON to XML Converter

Convert JSON objects into valid, formatted XML.

JSON to YAML Converter

Convert JSON objects to perfectly formatted YAML configuration files.

JWT Decoder

Decode a JSON Web Token and verify its signature and expiry.

Lorem Ipsum Generator

Generate placeholder text of any length for your designs and mockups.

Markdown to HTML

Convert Markdown text into clean HTML code.

MD5 Hash Generator

Generate an MD5 checksum hash from any text instantly.

Number Base Converter

Convert numbers between Binary, Octal, Decimal, and Hexadecimal instantly.

PHP Serializer

Serialize or unserialize PHP data structures securely.

Random Number Generator

Generate secure random numbers, integers, and decimals within a specific range.

Regex Tester

Test a PCRE pattern against your text and see every match and group.

SHA-1 Hash Generator

Compute the SHA-1 checksum hash for any text string instantly.

SHA-256 Hash Generator

Compute the highly secure SHA-256 checksum hash for any text string.

Slug Generator

Convert any text into a URL-friendly slug.

SQL Formatter

Format and beautify minified SQL queries into readable code.

Text Deduplicator

Remove duplicate lines from lists and text files instantly.

Text to ASCII

Convert text to ASCII art or standard ASCII binary codes.

Unix Timestamp Converter

Convert Unix timestamps to dates and back, in any timezone.

Time Zone Converter

Instantly convert a date and time between any two global time zones.

URL Encode / Decode

Percent-encode text for URLs, or decode it back — RFC 3986 and form encoding.

URL Parser

Break down any URL into its component parts (scheme, host, path, query).

User Agent Parser

Parse any User-Agent string to identify browser, OS, and device type.

UUID Generator

Generate UUID v4, time-ordered UUID v7, or ULIDs in bulk.

Word & Character Counter

Instantly count words, characters, sentences, paragraphs, and reading time.

XML Formatter

Format, validate and pretty-print XML documents.

Barcode Generator

Generate UPC, EAN, Code128, and other 1D barcodes as downloadable images.

EXIF Remover

Remove EXIF metadata from images to protect your privacy before uploading.

EXIF Metadata Viewer

Extract hidden camera metadata, GPS locations, and dates from images.

Favicon Generator

Turn one image into a complete favicon set with the HTML to match.

File Hash Checker

Calculate MD5, SHA1, and SHA256 checksums to verify file integrity.

File Size Converter

Accurately convert between Megabytes, Gigabytes, Terabytes, and bits.

Image Compressor

Shrink a JPEG, PNG or WebP and see what each quality costs.

Image Converter

Convert between WebP, JPEG, PNG, GIF and BMP in the browser.

Image Resizer

Resize or crop an image to exact dimensions or a percentage.

Image to Base64 Converter

Instantly encode any image into a Base64 data URI string.

Image Watermark

Add text or logo watermarks to your images online.

MIME Type Checker

Identify the true MIME type and extension of any uploaded file.

OG Image Generator

Generate Open Graph and Twitter Card images for social media sharing.

PDF Compressor

Compress PDF documents to reduce file size for email and web.

Merge PDF Files

Combine multiple PDF documents into a single PDF file quickly and securely.

Split PDF File

Extract pages from a PDF document or split it into multiple separate files.

Placeholder Image Generator

Generate blank dummy images of any size for wireframes and web development.

QR Code Generator

Make a QR code for a URL, Wi-Fi network, contact card or SMS.

SVG Optimizer

Minify and optimize SVG images to reduce file size without quality loss.

ZIP Extractor

Extract contents of ZIP files online without installing any software.

Database Size Calculator

Estimate database disk size based on row counts and column data types.

MyISAM to InnoDB Converter

Generate ALTER TABLE queries to bulk convert MySQL tables to the InnoDB engine.

SQL Injection Linter

Scan raw SQL queries for basic injection vulnerabilities and dangerous practices.

WordPress Serialized Search & Replace

Safely find and replace URLs in corrupted WordPress serialized arrays.

Bandwidth Calculator

Calculate download and upload times based on file size and internet speed.

Bandwidth & Storage Calculator

Calculate exactly how much hosting bandwidth and disk space your website needs.

DNS Migration Checklist

Interactive checklist and record verification before migrating DNS or changing hosts.

Email Health Report

Run a complete health check on your email server domain. Verifies MX, SPF, DKIM, and DMARC.

Hosting Cost Calculator

Estimate your monthly cloud hosting costs based on traffic and resource needs.

Hosting Plan Advisor

Take a quick quiz to find the perfect web hosting plan for your specific needs.

Migration Readiness Scanner

Scan a WordPress site to identify plugins and configurations that block server migrations.

Website Security Grade

Scan your website for security vulnerabilities, headers, and SSL issues to get a security grade.

Uptime SLA Calculator

Turn an uptime percentage into the downtime it really allows.

Website Health Report

Run a full domain health check: speed, SSL, DNS, SEO and security.