Web Development Tools
Free utilities to build, test, format, and optimize HTML, CSS, JavaScript, and web data directly in your browser.
Available tools
CSS Gradient Generator
Create linear or radial CSS gradients with a live preview and copy the code.
CSS Border Radius Generator
Adjust every corner visually and copy a ready-to-use border-radius declaration.
Flexbox Playground
Explore Flexbox direction, alignment, distribution, wrapping, and gap visually.
CSS Grid Playground
Generate a CSS grid with configurable columns, rows, and gaps with an instant preview.
HEX RGB HSL Converter
Convert colors between HEX, RGB, and HSL with validation and an instant preview.
Online Color Picker
Choose a color visually, copy HEX, RGB, or HSL, and compare contrast with white and black.
HTML Formatter
Format HTML with consistent indentation through a parser and download the result locally.
Base64 Encoder and Decoder
Encode Unicode text to Base64 or decode it correctly through UTF-8.
URL Encoder and Decoder
Encode and decode URL components with percent encoding and Unicode support.
UUID Generator
Generate between 1 and 100 secure UUID v4 values locally through Web Crypto.
Online HTML CSS JavaScript Editor
Write HTML, CSS, and JavaScript and see the result in an isolated preview inside your browser.
JSON Formatter and Validator
Validate, format, or minify JSON locally, compare sizes, and download the result.
CSS Minifier
Minify CSS with a reliable parser, compare file size, and download the resulting .css file.
JavaScript Minifier
Minify modern JavaScript locally with syntax-aware parsing and download the .js file.
CSS Box Shadow Generator
Create a box-shadow visually, adjust every value, and copy ready-to-use CSS.
Regex Tester
Test regular expressions, flags, and matches against text directly in your browser.
Unix Timestamp Converter
Convert Unix timestamps in seconds or milliseconds to UTC and local dates, and back.
Meta Tag Generator
Create your page title, meta description, canonical URL, and search engine directives, then copy the ready-to-use HTML.
Open Graph Preview
Simulate an approximate social card and generate Open Graph tags without querying external platforms.
Markdown to HTML Converter
Convert Markdown to HTML with an isolated preview and support for headings, lists, links, and code.
HTML Entities Encoder and Decoder
Encode special characters as HTML entities or safely decode them back to text.
robots.txt Generator
Create Allow and Disallow rules and add a sitemap with clear technical warnings.
XML Sitemap Generator
Paste URLs and generate valid sitemap XML with escaping, lastmod, and duplicate detection.
Showing 1–23 of 23 tools
Utilities for code and web data
Formatters and minifiers serve different purposes: formatters make code easier to read and review, while minifiers remove unnecessary characters before publishing. You can also validate JSON, test regular expressions, and transform data with Base64 or URL encoding.
Playgrounds help check HTML, CSS, and JavaScript in isolation. Color and CSS tools generate practical values, although final results should still be tested in the browsers your project supports.
Technical SEO tools for developers
Meta tag, Open Graph, robots.txt, and sitemap.xml generators help prepare markup and files, but every result should be reviewed against the real structure and rules of the site before publishing.
When a tool states that processing is local, content is transformed in your browser and is not sent to Utilsha. Code previews remain isolated in a restricted iframe.