Format, minify, encode, debug code, convert data formats, and optimize for SEO. Essential developer utilities.
ToolsHub packs 33+ free developer tools into a single, ad-light interface that respects your workflow. From formatting messy JSON to minifying production CSS, from decoding JWTs to generating UUIDs, every tool is built to save you time and keep your data private.
Our formatters and minifiers support JSON, HTML, CSS, JavaScript, SQL, and XML with syntax highlighting and one-click copy. Data-conversion tools let you move between CSV, JSON, XML, and YAML effortlessly. And our SEO toolkit — including Meta Tag, OpenGraph, Robots.txt, and Sitemap generators — helps you ship search-engine-friendly sites faster.
Whether you're debugging a regex pattern, encoding a string to Base64, checking password strength, or testing responsive layouts, ToolsHub has a purpose-built utility ready to go. All tools work offline after the initial page load, making them ideal for use on flights, in coffee shops, or anywhere with spotty connectivity.
PopularNewGenerate standard placeholder text for web design and publishing. Customize paragraphs and words.
PopularFormat, validate, and beautify JSON data with syntax highlighting.
Minify JSON data to reduce file size.
Format and beautify XML data with proper indentation.
Minify XML data to reduce file size.
Format and beautify HTML code with proper indentation.
Minify HTML code to reduce file size.
Format and beautify CSS code with proper indentation.
Minify CSS code to reduce file size and improve load times.
Format and beautify JavaScript code.
Minify JavaScript code to reduce file size.
Format and beautify SQL queries with proper indentation.
Minify SQL queries to reduce size.
PopularTest and debug regular expressions with real-time matching.
Decode and inspect JSON Web Tokens.
Encode or decode text and files to/from Base64 format.
Encode and decode URL strings.
Write and preview Markdown in real-time.
Convert Markdown to clean HTML code. Includes live preview and styling options.
Convert HTML back to clean Markdown syntax.
PopularNewCompare two pieces of text and see the differences highlighted line by line.
PopularPick colors and convert between HEX, RGB, and HSL formats.
PopularConvert CSV data to JSON format.
Convert JSON data to CSV format.
Convert CSV data to XML format.
Convert XML data to CSV format.
Convert YAML data to JSON format.
PopularGenerate SEO meta tags.
Create XML sitemaps.
NewGenerate OpenGraph and Twitter Card meta tags.
Create robots.txt files for SEO.
Check password security.
HTML character entity codes.
NewTest website on all devices.
Lorem Ipsum Generator
Generate standard placeholder text for web design and publishing. Customize paragraphs and words.
Text Diff Simulator
Compare two pieces of text and see the differences highlighted line by line.
OpenGraph Generator
Generate OpenGraph and Twitter Card meta tags.
Responsive Design Tester
Test website on all devices.
Common questions about developer tools
Essential utilities for developers and webmasters. Format messy code, minify for production, test regex patterns, generate meta tags, decode JWTs, and optimize for SEO—all in your browser with zero server round-trips.
Developer tools are specialized utilities that help programmers write, debug, optimize, and deploy code. They include formatters (beautify code), minifiers (compress for production), validators (check syntax), converters (transform data formats), and SEO utilities (meta tags, robots.txt, sitemaps).
Built with modern JavaScript libraries tailored to each task (Prettier for formatting, Terser for minification, etc.), these tools process code instantly in your browser. No compilation, no server-side processing—just fast, reliable utilities that respect your code privacy.
Developers need speed and privacy. Our tools run instantly without API calls, keep proprietary code local, and work offline. No accounts, no rate limits, no data collection. Just bookmark and use whenever you need.
Formatting minified JavaScript to understand third-party codeMinifying CSS and JS before deploying to reduce bundle sizeTesting and debugging regular expressions before implementing in codeDecoding JWT tokens to inspect claims and expirationGenerating SEO meta tags for new web pagesCreating robots.txt and sitemaps for better search engine crawlingConverting data between JSON, CSV, XML, and YAML formatsEncoding/decoding URLs for API requests
Format an entire codebase for readability before a code review
Complete SEO setup for new websites
Work with data: format, convert to spreadsheet-friendly format, convert back
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