Webmaster Tools

All the tools for your web project.

Free online tools for developers, webmasters and everyone who works with the web. Simple, fast and reliable – no sign-up required.

Tools
34
Categories
5
Free
100%

34 Tools

Popular

Meta Tag Generator

Create meta tags for your website quickly and easily.

SEO

robots.txt Generator

Generate a robots.txt file for your website.

SEO
Popular

Sitemap Generator

Create XML sitemaps in seconds.

SEO
New

SERP Snippet Preview

See how your page appears in Google search results.

SEO
New

Open Graph Preview

See how a link looks on Facebook, LinkedIn, X & WhatsApp.

SEO

Keyword Density Analysis

Find the most frequent words and phrases and check keyword density.

SEO
New

Schema.org Generator

Create structured data as JSON-LD – with Google’s required fields.

SEO
New

Hreflang Generator

Create and check hreflang tags for multilingual websites.

SEO
Popular

SSL Check

Check the SSL certificate of your domain.

Security
New

Security Header Check

Check HTTP security headers such as CSP, HSTS and X-Frame-Options.

Security
New

Password Generator

Generate secure passwords, passphrases and PINs.

Security
New

htpasswd Generator

Create login credentials for directory protection via .htaccess.

Security
New

Hash Generator

Calculate MD5, SHA-1, SHA-256 and more for text and files.

Security
Popular

JSON Formatter

Format, validate and minify JSON data.

Development
New

YAML Viewer & API Tester

Open, validate and convert YAML to JSON – and test OpenAPI endpoints.

Development
New

Regex Tester

Test regular expressions live with highlighted matches.

Development
New

Base64 Encoder / Decoder

Encode and decode text and files as Base64 – with data URIs.

Development
New

URL Encoder / Decoder

Percent-encode and decode URLs and parameters.

Development
New

HTML Entities

Encode and decode special characters as HTML entities – with character table.

Development
New

CSS Minifier

Minify or beautify CSS – safely, with gzip savings.

Development
New

UUID Generator

Generate UUIDs v4, v7, v1, v5 and v3 – one or 1,000 at a time.

Development
New

Cron Generator

Build cron expressions visually and understand them in plain English.

Development
New

Unix Timestamp Converter

Convert Unix timestamps to dates and back – with time zones.

Development
New

Redirect Generator

Create 301 redirects for .htaccess, nginx, PHP and IIS.

Server & Network
New

HTTP Status Check

Check the HTTP status codes of up to 100 URLs at once.

Server & Network
New

Redirect Checker

Follow redirect chains step by step and find loops.

Server & Network
New

DNS Lookup

Query DNS records and check SPF, DMARC and DNSSEC.

Server & Network
New

WHOIS Lookup

Registrar, expiry date and status of a domain – via RDAP and WHOIS.

Server & Network
New

My IP Address

Show your public IPv4 or IPv6 address – with type, hostname and provider.

Server & Network
New

Color Converter

Convert colors between HEX, RGB, HSL and more.

Design
New

Contrast Checker

Check color contrast according to WCAG 2.2 – with suggestions.

Design
New

Favicon Generator

Create favicons for all devices from an image, text or emoji.

Design
New

QR Code Generator

Create QR codes for links, Wi-Fi and contacts – as SVG or PNG.

Design
New

Audio Converter

Convert MP3, WAV, AIFF, FLAC and OGG – right in your browser, without uploading.

Design

Why gutowski.org tools?

Simple. Fast.
Reliable.

Every tool is built to do one job really well – no distractions, no hurdles.

100% free

All tools are and will remain free – no hidden limits, no premium paywalls.

No sign-up

No account, no email address. Just open a tool and get started.

Privacy-friendly

Wherever possible, the tools run right in your browser. Your data stays with you.

Lightning fast

Lean and free of unnecessary clutter – results in seconds, on mobile too.

Missing a tool?

Tell me which tool would make your work easier – the best ideas get built.

Suggest a tool