Free online tools
Tools for developers, webmasters and site owners
Check DNS, SSL, WHOIS, generate passwords, calculate VAT and more — all for free, without registration.
Network, DNS, IP
See allCheck my IP and ISP
Quickly check your public IP address (IPv4/IPv6), internet service provider (ISP) name, and host.
IP Geolocation
Locate any IP address. Check the country, city, internet provider, and time zone.
DNS Records Lookup
Check DNS records of any domain: NS, A, MX, TXT, CNAME, and others.
Domain WHOIS
Check domain owner, registrar, registration, and expiration dates.
SSL Certificate
Check SSL certificate validity, issuer, and supported TLS protocol.
SPF Record Analysis
Analyze SPF record for errors and limits.
HTTP Status
Check the HTTP code returned by any website.
Developer tools
See allJSON Validator & Parser
Validate JSON code and format it into a readable form.
Text Comparison
Compare two texts line by line and find differences.
Base64 Encoder / Decoder
Encode and decode text or files in Base64 format.
URL Encoder / Decoder
Encoding and decoding special characters in URLs.
Unix Timestamp Converter
Convert Unix timestamp to date and vice versa.
Letter Case Converter
camelCase, snake_case, kebab-case, UPPERCASE, and other formats.
Lorem Ipsum Generator
Generate Lorem Ipsum placeholder text in different variants.
UUID Generator
Generate UUIDs online — v1, v4, and v5. Validate and decode existing UUIDs. Copy individually or in bulk.
SEO and page analysis
See allPage Header Structure
Check HTML header hierarchy on any page.
Open Graph Preview
Check how your page looks when shared.
Robots.txt tester
Download and analyze robots.txt file. Check if a given URL is blocked for Googlebot, Bingbot, and others.
Meta Tag Analyzer
Check page meta tags — title, description, Open Graph, Twitter Card, and robots. Get an SEO score with recommendations.
Finance and calculators
See allUniversal
See allArticles
Robots.txt guide
Everything about the robots.txt file — syntax, directives, examples, and common mistakes.
SSL errors
Meet the most common SSL/TLS errors and learn how to diagnose and fix them.
DNS errors
Meet the most common DNS errors and learn how to diagnose and fix them.
Secure passwords
Learn how to create strong passwords, what to avoid, and how to use a password manager.
Page Header Structure
Learn what HTML headings H1-H6 are, how to build a correct hierarchy, how they affect SEO and accessibility, and how to check the heading structure of your page.
DNS Record Information
Learn all DNS record types: A, AAAA, CNAME, MX, TXT, NS, PTR and others. Find out what TTL, SPF, DKIM, DMARC are and how to check your domain's records.
Text formatting styles
Learn the most popular text writing styles used in programming and SEO: camelCase, PascalCase, snake_case, kebab-case and others.
What is an IP address / IPv4 / IPv6?
Learn how to check your IP address, what the difference between IPv4 and IPv6 is, and how to check your location and internet provider.
HTTP Codes List
Complete reference of HTTP response codes (200, 301, 404, 500 and more). Learn what they mean and how they affect your website.
What is an SPF record?
Everything about SPF records. Learn how to protect your domain from spoofing and improve email deliverability.
Errors in SPF records
Learn why an SPF record may return a fail or permerror. We explain the most common issues and how to fix them.
Free online tools for developers and webmasters
wtoolsy.com is a collection of free web tools created for developers, server administrators, SEO specialists, and website and online store owners. All tools work directly in the browser — no registration, no fees, and no software installation.
Network and DNS
Check DNS records, SSL certificates, WHOIS data, and HTTP codes.
Dev Tools
Validate JSON, encode Base64, test regular expressions, and more.
Finance
VAT, margin, discount, and percentage calculators for businesses and e-commerce.
SEO
Analyze headers, check Open Graph, and optimize pages for search engines.
Why use wtoolsy.com?
No registration
All tools available immediately — no accounts, emails, or passwords.
Multilingualism
Tools available in different languages: Polish, English, German, and others.
Privacy
Data processed locally in the browser — we do not send it to external servers.