Drawing App using HTML, CSS & JavaScript

Drawing App using HTML, CSS & JavaScript

Drawing App using HTML, CSS & JavaScript

Hello, today we’re going to learn how to use HTML, CSS & JavaScript to create a Drawing App. By following these instructions, you can simply make this Drawing App in HTML, CSS & JavaScript. Simply by adhering to the procedures mentioned below, you will be able to develop this amazing Drawing App.

Drawing App Javascript

This project will is good for beginners and help them to build their front-end development skills. In Today’s session, We will use HTML, CSS, and JavaScript to complete this Drawing App Project.

Project Description

Step 1
The HTML (Hypertext Markup Language) will help us to create the structure for the list with some necessary attributes and elements to make Drawing App Project.

Step 2
Then we will use CSS (Cascading Stylesheet) which will help us to style or design the project with suitable padding and alignment in the Drawing App Project.

Step 3
At last we will use JS (JavaScript) which will add a logic to make the Drawing App Project functioning from the user end.

I hope you have got an idea about the project.

HTML Code for Drawing App

Create Otp Input Field Html Css Javascript ( Source Code)

<html lang="en">
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Drawing App</title>
    <!-- Google Font -->
    <!-- Stylesheet -->
    <link rel="stylesheet" href="style.css" />
    <div id="paintArea">
      <canvas id="canvas"></canvas>
    <div class="options">
      <div class="tools" id="tools-section">
        <div class="tools-row">
          <div class="tools-wrapper">
            <h5><span id="tool-type"></span> Size:</h5>
            <input type="range" id="pen-slider" value="4" />
          <div class="tools-wrapper">
            <input type="color" id="color-input" />
          <div class="tools-wrapper">
            <h5>Background Color:</h5>
            <input type="color" id="color-background" />
        <div class="tools-row">
          <button id="button-clear">Clear</button>
          <button id="button-pen">Pen</button>
          <button id="button-erase">Erase</button>
    <!-- Script-->
    <script src="script.js"></script>

First we’ll start with creating the structure of the Drawing App project for that as you can see the above code we have used all the necessary elements & attributes to setup the structure. Let us know code the CSS part to add styling and aligned the tags.

CSS Code for Drawing App

* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
  font-family: "Poppins", sans-serif;
#paintArea {
  position: relative;
  border: 8px solid #788eff;
  height: 70vh;
  width: 100%;
.options {
  height: 30vh;
  background-color: #788eff;
  padding: 30px;
.tools-row {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 20px;
  margin-bottom: 40px;
.tools-row h5 {
  margin-bottom: 10px;
  color: #ffffff;
  font-weight: 400;
  font-size: 18px;
  letter-spacing: 0.5px;
.tools-row button {
  padding: 12px 0;
  border-radius: 25px;
  border: none;
  background-color: #ffffff;
  font-size: 18px;
  color: #788eff;
input[type="range"] {
  height: 40px;
input[type="color"] {
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  background-color: transparent;
  width: 70px;
  height: 40px;
  border: none;
  cursor: pointer;
input[type="color"]::-webkit-color-swatch {
  border-radius: 8px;
  border: 3px solid #000000;
input[type="color"]::moz-color-swatch {
  border-radius: 8px;
  border: 3px solid #000000;

Second comes the CSS code, which is mentioned above in that we have styled for the structure we have padded as well as aligned the Drawing App project so that it is properly situated and doesn’t get messy with suitable CSS elements. Now we have created the structure using HTML and styled the webpage using CSS its time to add the functionality using JavaScript in this project.

JavaScript Code for Drawing App

Portfolio Website using HTML and CSS (Source Code)

//Initial references
let colorsRef = document.getElementsByClassName("colors");
let canvas = document.getElementById("canvas");
let backgroundButton = document.getElementById("color-background");
let colorButton = document.getElementById("color-input");
let clearButton = document.getElementById("button-clear");
let eraseButton = document.getElementById("button-erase");
let penButton = document.getElementById("button-pen");
let penSize = document.getElementById("pen-slider");
let toolType = document.getElementById("tool-type");
//eraser = false and drawing=false initially as user hasn't started using both
let erase_bool = false;
let draw_bool = false;
//context for canvas
let context = canvas.getContext("2d");
//Initially mouse X and Y positions are 0
let mouseX = 0;
let mouseY = 0;
//get left and top of canvas
let rectLeft = canvas.getBoundingClientRect().left;
let rectTop = canvas.getBoundingClientRect().top;

//Inital Features

const init = () => {
  context.strokeStyle = "black";
  context.lineWidth = 1;
  //Set canvas height to parent div height
  canvas.style.width = "100%";
  canvas.style.height = "100%";
  canvas.width = canvas.offsetWidth;
  canvas.height = canvas.offsetHeight;
  //Set range title to pen size
  toolType.innerHTML = "Pen";
  //Set background and color inputs initially
  canvas.style.backgroundColor = "#ffffff";
  backgroundButton.value = "#ffffff";
  penButton.value = context.strokeStyle;

//Detect touch device
const is_touch_device = () => {
  try {
    //We try to create TouchEvent (it would fail for desktops and throw error)
    return true;
  } catch (e) {
    return false;

//Exact x and y position of mouse/touch
const getXY = (e) => {
  mouseX = (!is_touch_device() ? e.pageX : e.touches?.[0].pageX) - rectLeft;
  mouseY = (!is_touch_device() ? e.pageY : e.touches?.[0].pageY) - rectTop;

const stopDrawing = () => {
  draw_bool = false;

//User has started drawing
const startDrawing = (e) => {
  //drawing = true
  draw_bool = true;
  //Start Drawing
  context.moveTo(mouseX, mouseY);

//draw function
const drawOnCanvas = (e) => {
  if (!is_touch_device()) {
  //if user is drawing
  if (draw_bool) {
    //create a line to x and y position of cursor
    context.lineTo(mouseX, mouseY);
    if (erase_bool) {
      //destination-out draws new shapes behind the existing canvas content
      context.globalCompositeOperation = "destination-out";
    } else {
      context.globalCompositeOperation = "source-over";

//Mouse down/touch start inside canvas
canvas.addEventListener("mousedown", startDrawing);
canvas.addEventListener("touchstart", startDrawing);

//Start drawing when mouse.touch moves
canvas.addEventListener("mousemove", drawOnCanvas);
canvas.addEventListener("touchmove", drawOnCanvas);

//when mouse click stops/touch stops stop drawing and begin a new path

canvas.addEventListener("mouseup", stopDrawing);
canvas.addEventListener("touchend", stopDrawing);

//When mouse leaves the canvas
canvas.addEventListener("mouseleave", stopDrawing);

//Button for pen mode

penButton.addEventListener("click", () => {
  //set range title to pen size
  toolType.innerHTML = "Pen";
  erase_bool = false;

//Button for eraser mode
eraseButton.addEventListener("click", () => {
  erase_bool = true;
  //set range title to erase size
  toolType.innerHTML = "Eraser";

//Adjust Pen size
penSize.addEventListener("input", () => {
  //set width to range value
  context.lineWidth = penSize.value;

//Change color
colorButton.addEventListener("change", () => {
  //set stroke color
  context.strokeStyle = colorButton.value;

//Change Background
backgroundButton.addEventListener("change", () => {
  canvas.style.backgroundColor = backgroundButton.value;

clearButton.addEventListener("click", () => {
  context.clearRect(0, 0, canvas.width, canvas.height);
  canvas.style.backgroundColor = "#fff";
  backgroundButton.value = "#fff";

window.onload = init();

Last stage of the project the JavaScript in which we have added the logical and coded as per the requirement with some conditions. In this lengthy JS code we have coded the functionality of each defined structure with some conditions. To make this project functioning we have added the features of the drawing app under the event listener function and pass om some conditions so that it act as per the user action and throws the error when it doesn’t satisfies the condition. Let us see the Final Output of the project Drawing App using HTML, CSS & JavaScript (Source Code).

Let us see the Final Output of the project Drawing App using HTML, CSS & JavaScript (Source Code).

100+ JavaScript Projects With Source Code ( Beginners to Advanced)


Live Preview of Drawing App using HTML, CSS & JavaScript

See the Pen
by Harsh Sawant (@harshh9)
on CodePen.

We have Successfully created our Drawing App using HTML, CSS & JavaScript (Source Code). You can use this project for your personal needs and the respective lines of code are given with the code pen link mentioned above.

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Code Idea – codingartist

Written By – Harsh Sawant

Code By – @harshh9

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