Free SEO, Developer and Networking Tools
Small, free tools for everyday SEO, development and networking tasks. They run entirely in your browser: what you type is not uploaded or stored.
SEO tools
SEO · SEO
Meta Title and Description Checker
Check title tag and meta description length in characters and pixels, with a live preview of how the result may look in Google.
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SEO · SEO
Robots.txt Generator
Build a robots.txt file with crawler rules, sitemap links and one-click presets for AI crawlers such as GPTBot and ClaudeBot.
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SEO · SEO
XML Sitemap Validator
Paste a sitemap or sitemap index to check the XML, namespace, URLs, lastmod dates, duplicates and size limits in your browser.
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SEO · SEO
Schema Markup Generator (JSON-LD)
Generate JSON-LD structured data for organisations, local businesses, articles, FAQs, breadcrumbs, people and products.
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SEO · SEO
Word Counter and Keyword Density Checker
Count words, characters, sentences and paragraphs, estimate reading and speaking time, and see your most frequent keywords.
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SEO · SEO
Keyword Grouping Tool
Paste a keyword list and group it by shared words, with simple plural matching, then export the groups as a CSV.
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SEO · SEO
Internal Link Planner
Paste your pages with their main topics to get internal link suggestions, anchor text ideas and a CSV plan to work from.
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Developer tools
Developer · Developer
HTML Formatter and Minifier
Beautify HTML with 2 or 4 space indents or minify it, keeping pre, textarea, script and style content exactly as written.
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Developer · Developer
JSON Formatter and Validator
Format, minify and validate JSON with clear error messages showing the line and column, plus optional key sorting.
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Developer · Developer
SQL Formatter and Beautifier
Format SQL queries with clauses on new lines, indented conditions and column lists, optional uppercase keywords, or minify them.
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Developer · Developer
Base64 Encoder and Decoder
Encode and decode Base64 with full UTF-8 support, a URL-safe option and file to data URI conversion, all in your browser.
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Developer · Developer
CSS and JavaScript Minifier
Strip comments and whitespace from CSS and JavaScript, and see the size before and after with the percentage saved.
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Networking and security
Networking · Networking
IPv4 Subnet Calculator
Work out network and broadcast addresses, usable host range, masks and binary for any IPv4 address and prefix, and split subnets.
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Networking · Networking
Binary, Decimal and Hex Converter
Convert numbers between binary, decimal, hexadecimal and octal, and IPv4 addresses between dotted decimal and binary octets.
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Networking · Networking
Common Port Numbers Reference
Search common TCP and UDP port numbers by port, service or protocol, with short notes on what each is used for.
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Security · Security
Password Strength Checker
Check how guessable a password is, spot weak patterns such as common words, sequences and dates, and get specific suggestions.
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