25 Free Web-Based Apps & Tools For Working With CSS

We've collected our favourite tools and apps for working with CSS that are definitely worth bookmarking.

Web Design
Portrait for EnvatoBy Envato  |  Updated August 24, 2023

We’ve collected 25 small web-based apps and tools that will in one way or another offer quick solutions to many of those frustrating and time-consuming tasks you will often have to overcome when working with CSS.

There are apps that will calculate EM sizes from PXs, tools for minimizing and cleaning your CSS, resources for generating CSS animations, CSS typography snippets, converters for turning images into base64 encoded strings, generators for creating Flexbox layouts, and much more.

Check out these articles for more resources:

You may not need them today, but they are all worth bookmarking, as you just never know when you will need them.

1. Visual Guide to CSS3 Flexbox Properties

Rather that explaining how the flex properties work, this visual guide focuses on how the flex properties affect layouts.

Visual Guide to CSS3 Flexbox Properties

2. extractCSS

extractCSS is a tool for extracting ids, classes and inline styles from an HTML document and then outputting them as a CSS stylesheet.

extractCSS

3. CSS Beautifier

CSS Beautifier will automatically format your CSS styles so that they are consistent and easier to read.

CSS Beautifier will automatically format your CSS styles

4. CSScomb

CSScomb is a coding style formatter that will sort CSS properties into a specific pre-configured order.

CSScomb is a coding style formatter that will sort CSS properties

5. ProCSSor

Just like CSScomb and CSS Beautifier above, ProCCSer offers formatting functionalities, but does give you far more control over the output.

ProCCSer offers formatting functionalities

6. CSS Compressor

CSS Compressor is a handy little app that will minimize and compress your CSS.

CSS Compressor is a handy little app that will minimize and compress your CSS

7. StyleStats

StyleStats is a little tool (and Node.js library) for collecting useful CSS stats from any stylesheet. Just input the URL and click ‘parse’.

StyleStats is a little tool for collecting useful CSS stats

8. CSS Trashman

CSS Trashman examines your site’s live DOM and reverse engineers a new, more elegant definition that captures styles down to the pixel. The generated CSS (or Sass) will be customized for your site and ready to be downloaded and dropped into place.

CSS trashman examines your site's live DOM and reverse engineers

9. Live CSS Editor

Live CSS Editor is a Chrome and Safari extension that allows you to freely write CSS rules on any site and instantly see the results.

Chrome extension Live CSS Editor

10. Purify CSS

Purify CSS is a handy tool that detects which CSS selectors your app is using and creates a file without unncessary CSS.

Purify CSS

11. CSS Gradient Animator

CSS Gradient Animator is, as the name suggests, a handy little tool for quickly generating CSS gradients.

CSS Gradient Animator

12. px-em

px-em is a really, really small tool that will work out the EM sizes from PXs. Just add the parent PX size in the box, and the required size in the bottom, and you’re done.

px-em is a really, really small tool that will work out the EM sizes from PX

13. RQRWDC

RQRWDC (Really Quick Responsive Web Design Calculator) is a responsive web design tool that allows you to work out an elements width in % from PX.

RQRWDC Really Quick Responsive Web Design Calculator is a responsive web design tool

14. Fibonacci

Fibonacci is a really handy generator for creating Flexbox layouts.

Fibonacci is a really handy generator for creating page layouts using Flexbox

15. Flat UI Color Picker

This is a huge collection of inspiring flat UI colors that you can easily copy and paste into your own stylesheet.

a huge collection of inspiring flat UI colors

16. PatternBolt

PatternBolt is a collection of SVG patterned backgrounds, packed into a single CSS/SASS file.

PatternBolt is a collection of SVG patterned backgrounds

17. CSS Animation Generator

This is a tool for quickly generating small CSS animations. Just copy and paste the generated CSS and HTML into your own project.

This is a tool for quickly generating small CSS animations

18. CSS Shorthand Generator

Shrthnd is a handy tool that converts CSS properties into shorthand, making shorter and more readable stylesheets.

Shrthnd is a handy tool that converts CSS properties into shorthand

19. iconizr

iconizr is a tool for converting SVG images into a set of CSS icons.

iconizr is a tool for converting SVG images into a set of CSS icons

20. CSSynth

CSSynth is a handy little app that will help to run CSS animations in order.

CSSynth is a handy little app that will help to run CSS animations in order

21. Create CSS3

Create CSS3 is an app that allows you to generate all of the CSS3 code you will ever need quickly and easily, with fallbacks where required.

Create CSS3 is an app that allows you to generate all of the CSS3 code

22. Flexplorer

Flexplorer is a simple tool for generating flexbox code for lists.

Flexplorer is a simple tool for generating flexbox code for lists

23. Duri.me – DataURI Converter

Duri.me is a Data URI converter that will turn images into base64 encoded strings that can then be inputted directly in your HTML and CSS files.

Duri.me is a Data URI converter

24. Gridpak Responsive Grid Generator

Gridpak is a useful tool for generating a responsive grid system. It gives you control over every aspect of the grid from column padding to where ‘break points’ occur.

Gridpak is a useful tool for generating a responsive grid system

25. CSS Diner

CSS Diner is a simple little game that will help you learn about CSS selectors. All you have to do is type in the correct selector to complete each level. Go on, give it a try.

CSS Diner is a simple little game that will help you learn about CSS selectors

Also Worth Mentioning:

  • Layoutit – A Bootstrap drag & drop interface builder.
  • NTH-TEST – A nth-child and nth-of-type tester.
  • Picssel-Art – An app for creating pixel art using CSS.

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