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16 tools

Web Development Tools

Web development tools cover the routine front-end tasks that interrupt a working day: making minified HTML, CSS or JavaScript readable again, shrinking them before a deploy, converting a colour between hex, RGB and HSL, and looking up what a 422 response or an unfamiliar MIME type actually means. Formatting and minification run entirely in your browser.

Front-end work generates a steady stream of small interruptions. A stylesheet arrives minified and you need to read one rule. A designer supplies hex and the CSS needs HSL. An API returns 422 and you need to know whether that is your fault or theirs.

The formatters here only change whitespace between tokens — string literals, template literals, regular expressions and comments come through byte for byte, which is what makes them safe to point at third-party code you did not write.

HTML

2 tools

Make markup readable, or strip it down for production.

CSS and JavaScript

4 tools

Format for reading, minify for shipping.

Markup and content

4 tools

Turn Markdown into HTML you can paste somewhere else.

URLs and headers

3 tools

Take apart the strings that carry a request, without making one.

Colour and references

3 tools

Convert colour notations and look up the specifications you half-remember.

What people use these for

  • Read one rule inside a minified third-party stylesheet.
  • Convert a designer's hex palette into HSL so you can adjust lightness systematically.
  • Check whether a 409 or a 422 is the right status code for a failed validation.
  • Find the correct Content-Type to serve a font or a WebP image.
  • Minify a small inline script before pasting it into a template.
  • Tidy machine-generated HTML so a colleague can review the diff.

Web Development Tools: frequently asked questions

Will the formatters break my code?
They only alter whitespace between tokens. Strings, template literals, regular expressions and comments are preserved exactly, so the code behaves identically afterwards. That said, always run your test suite after reformatting anything you intend to ship.
Is the JavaScript minifier a full compressor?
No. It removes comments and unnecessary whitespace. It does not rename variables, drop unreachable code or perform the tree-shaking a build-time minifier such as Terser or esbuild does. For production bundles, use your build pipeline; this is for one-off snippets.
Is my code sent to a server?
No. Every formatter and minifier in this hub runs in your browser, which is what makes it safe to paste unreleased or proprietary code.
Which colour formats does the converter support?
Hex (both three and six digit), RGB and RGBA, HSL and HSLA, and named CSS colours. It converts between all of them and shows a preview swatch so you can confirm the result before copying it.
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Last reviewed 7 August 2026.