Publiée le 30.04.2024

Ressources gratuites pour le développeur front-end

Quelques ressources utiles pour le développement web, concernant la partie front-end (HTML/CSS notamment) à destination des novices et personnes expérimentés.

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Outils (English)


COLOURlovers: User created & shared color palette inspiration

ColorPicker: Online Color Picker Tool

Color Hex: A free color tool providing information about any color

Flat UI Colors: Web app helps you to copy the colors from Flat UI

Contrast Ratio: Easily calculate color contrast ratios

Color Safe: Color palettes based on WCAG Guidelines

Color Contrast Checker: Check color contrast by analyzing difference between foreground and a background color.

Colllor: Color palette generator

Paletton: Tool for creating color combinations

Colorpeek: Quickly preview, share and convert one or more CSS colors, including hex, RGB, HSL, RGBA and color keywords.

Colourcode: Online designer tool, which allows you to easily and intuitively combine colours.

Chrome Daltonize!: Daltonization is a technique of exposing details to color-blind users, allowing them to see what they otherwise would have missed.

Flat UI Color Picker: Flat Color Picker which gives you the perfect colors for flat designs.

SassMe: A Tool for Visualizing SASS Color Functions

HEX To RGB: Convert Hex color to RGB.

HSL to RGB: HSL to RGB / RGB to HSL converter.

Colour Scheme Calculator: Choose a starter color to calculate its color wheel including triad, complementary, analogous, and split complementary colours, plus saturation and lightness variations.

CSS Generators

Ultimate CSS Gradient Generator: CSS gradient generator

EnjoyCSS: All in one CSS generator

CSS MenuMaker: Create responsive website navigation

On/Off Flip switch: Generate CSS3 On/Off flip switches

CSSmatic:Gradient, border radius, box shadow & noise texture generator

CSS Triangle: CSS triangle generator

CSS Arrow Please: CSS arrow generator

Patternify: A CSS Pattern Generator

CSS3 Patterns Gallery: CSS3 patterns gallery

Critical Path CSS Generator: Speed up your page render time

Button Generator: CSS button generator

Layout Generator: Create CSS layout

Tridiv: Web-based editor for creating 3D shapes in CSS

Trianglify: Generate colorful triangle meshes that can be used as SVG images and CSS backgrounds

Delaunay Triangle: Triangle pattern maker that can be used as background

Bear CSS: Generates a CSS template containing all the HTML elements, classes & IDs defined in your markup

Stylie: A fun CSS animation tool

Calculator & Converter

PXtoEM: Convert pixels to EM

DPI Love: Find DPI/PPI of any screen

CSS Inliner:Automatically inline your email’s CSS

Code Beautify: Beautify, Validate, Minify, Analyze and Convert your JSON, XML, JavaScript, CSS, HTML, Excel

Pixel Density Converter: Tells you how to scale graphics between four density groups.

Is This Retina?: DPI/PPI Display calculator

Specificity Calculator:A visual way to understand CSS specificity

NTH-Test: nth-child and nth-of-type Tester

Typography & Font

Google Fonts: Open source web fonts

Font Squirrel: Hand picked free web fonts

Dafont: Archive of freely downloadable fonts

Font Space: Download free fonts

Type Genius: Find the perfect font combo

Golden Ratio Typography Calculator: Discover the perfect typography for your website

What Font Is: Identify font from a image

Typetester: Compare Web fonts from Adobe Edge, Google and Typekit

Tiff: Find out difference between Google fonts Preview the output of fonts for a selected word

TypeWonder: Test web fonts on any live website

Fit Text: A jQuery plugin for inflating web type


Font Awesome: Scalable vector icons that can instantly be customized

Material Design Icons: 750 glyphs Material Design system icons pack by Google Design

Iconogen: Generate favicons, Windows 8 Tiles, Apple Touch icons, Android and iOS icons

Marka: Beautiful transformable icons

Maki: Icon set for web cartography

Fontello: Icon font generator

Fontastic: Create your own icon font

Entypo: A suite of 411 carefully crafted premium pictograms by Daniel Bruce

Typicons: Free-to-use vector icons embedded in a webfont for easy use in your user interfaces

Iconmonstr: A large collection of glyph icons from a German artist

Octicons: Icon font launched by GitHub

GlyphSearch: Search for icons from Font Awesome, Glyphicons, IcoMoon, Ionicons, and Octicons

Analyze Website Style

Stylify Me: Overview of the style guide of a site, including colors, fonts, sizing and spacing

Type-o-matic: A browser extension that finds all the fonts on a page


CodePen: Show case of advanced techniques with editable source code

JSFiddle: Test and share JavaScript, CSS, HTML or CoffeeScript online

JS Bin: A live pastebin for HTML, CSS & JavaScript and a range of processors

CSSDeck: Collection of Awesome CSS and JS Creations to help out frontend developers and designers

Dabblet: An interactive CSS playground and code sharing tool

Liveweave: Liveweave is a HTML5, CSS3 & JavaScript playground for web designers and developers

Adobe Edge Reflow: Design tool that supplements your design workflow to help you create beautiful responsive designs for all screen sizes

webflow: Drag-and-drop website builder for creating professional responsive websites

Macaw: Provides the same flexibility as your favorite image editor but also writes semantic HTML and remarkably succinct CSS

Developer Tools

Chrome DevTools: Set of web authoring and debugging tools built into Google Chrome

Grunt: The JavaScript Task Runner for automating tasks

Bower: Solution to the problem of front-end package management

Yeoman: A generator ecosystem, basically a plugin that can be run with the `yo` command to scaffold complete projects or useful parts

Can I Use: Up-to-date browser support tables for support of front-end web technologies

HTML5 Please: Look up HTML5, CSS3 & find out if they are ready for use

CSS Values: CSS Reference, Properties and Values

CSS Triggers: An invaluable reference on how CSS affects performance


W3C Markup Validation: Checks the markup validity of Web documents in HTML, XHTML, SMIL, MathML

HTML_CodeSniffer: Checks HTML source code and detects violations of a defined coding standard

W3C CSS Validation: Check (CSS) and (X)HTML documents with style sheets

CSS Lint: Points out problems with your CSS code

JS Lint: JavaScript program that looks for problems in JavaScript programs

PhantomCSS: Visual/CSS regression testing with PhantomJS

CSS Critic: Regression testing of CSS

DiagnostiCSS: Visually detect any potentially invalid or inaccessible HTML markup

QUnit: A JavaScript Unit Testing framework

Dromaeo: JavaScript Performance Testing

Opera Mobile Classic Emulator: Use the profile selector to spawn multiple Opera Mobile Classic instances with a defined resolution, pixel density, user interface


Pingdom Website Speed Test: Test & analyze the load time of a live page

WebPagetest: Website speed test from multiple locations around the globe

PageSpeed Insights: Analyzes website and suggest ways to make it load faster

GTmetrix: Grade site’s performance and provides recommendations to fix these issues

YSlow: Analyzes & offers suggestions for improving the page’s performance

Perfmap: A performance heatmap of resources loaded in the browser


CSSCSS: Let you know which rulesets have duplicated declarations

Helium: javascript tool to scan your site and show unused CSS

CSS Tidy: Opensource CSS parser and optimiser

CSS Compressor: Compress your CSS to increase loading speed

CSS Dig: Take a look at all your CSS properties, their frequency and variations

JavaScript Minifier: Minify your JavaScript

FF Subsetter: Reduce the font file size to optimize bandwidth usage Reduce the size of your images while maintaining a high quality

Prefix free: add the current browser’s prefix to any CSS code only when it’s needed

Sprite Cow: Generate CSS for sprite sheets

TinyPNG: Advanced lossy compression for PNG images

Adaptive Images: Detects your visitor’s screen size and automatically creates, caches, and delivers device appropriate re-scaled versions of images

Outils (French)

Générateur de font

Google font generator :

Dafont :

Outils HTML :

Scriptol :

Initializr :


Générateur HTML :

Validateur de code HTML

Validateur (X)HTML du W3C :

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