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Build a Spy Number Checker using HTML CSS and JavaScript
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Create a Resize and Compress Images in HTML CSS & JavaScript

Last Updated : 01 Aug, 2024
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While using the GeeksforGeeks Write Portal to write articles, we need to upload the images. As we need to resize the image as per GeeksforGeeks's requirement, we search for different tools and websites on the internet to resize and compress the image. But, as a web developer, we can create our own image resize and compressor using HTML, CSS, and JavaScript.

This project contains HTML, CSS, and JavaScript files. The HTML files consist of the overall structure of our application; the CSS file contains the layout and styling of the application. The JavaScript file has the complete functionality to handle the images, resize and compress them, and also download them.

Preview

Screenshot-2023-10-09-at-12-28-44-Image-Resizer-and-Compressor-min

Prerequisites

  • HTML
  • CSS
  • JavaScript

Approach:

For resizing and compressing the image, we will first prompt the user to load the image in the application. Once the user uploads the image, a basic preview of the image is displayed to the user, and then the user needs to be given the desired ratio of width and height, as well as the provision to set the quality of the image by dynamically adjusting the quality bar. When the user does the customization, the user needs to press the button. After pressing the button, the image gets resized and compressed; simultaneously,  the preview gets updated, and the download button is pressed. The user can download the image by clicking on this button.

Example: This example describes the basic implementation for resizing and compressing the image in HTML, CSS and JavaScript lanaguage.

HTML 
<!DOCTYPE html> <html lang="en">  <head>     <meta charset="UTF-8">     <meta name="viewport"            content="width=device-width,                      initial-scale=1.0">     <title>         Image Resizer and Compressor     </title>     <link rel="stylesheet" href="styles.css"> </head>  <body>     <div class="container">         <h1 class="title">             Image Resizer and Compressor         </h1>          <div class="image-upload">             <label for="imageInput"                     class="upload-label">                 <i class="fas fa-cloud-upload-alt">                 </i> Upload an Image             </label>             <input type="file"                     id="imageInput"                     accept="image/*">         </div>          <div id="action-form"               style="display: none;">             <div class="output">                 <h2 class="preview-label">                     Preview:                 </h2>                 <img id="preview" alt="Preview">                 <p id="image-dimensions"                     style="margin-top: 10px;">                 </p>             </div>              <div class="controls">                 <div class="control-group">                     <label for="resizeUnit">                         Unit:                     </label>                     <select id="resizeUnit">                         <option value="pixels">                             Pixels                         </option>                         <option value="percentage">                             Percentage                         </option>                     </select>                 </div>                  <div class="control-group"                       id="pixel-dimensions">                     <label for="resizeWidth">                         Width:                     </label>                     <input type="number"                             id="resizeWidth"                             placeholder="Width">                     <span>px</span>                 </div>                  <div class="control-group"                       id="percentage-dimensions"                       style="display: none;">                     <label for="resizePercentage">                         Percent:                     </label>                     <input type="number"                             id="resizePercentage"                             placeholder="Percentage"                             min="1"                             max="100">                     <span>%</span>                 </div>                  <div class="control-group"                       id="pixel-height-dimensions">                     <label for="resizeHeight">                         Height:                     </label>                     <input type="number"                             id="resizeHeight"                             placeholder="Height">                     <span>px</span>                 </div>                  <div class="control-group quality-group">                     <label for="quality">                         Quality:                     </label>                     <input type="range"                             id="quality"                             min="1"                             max="100"                             value="80">                     <span id="quality-value"                            class="quality-value">                       80                       </span>                 </div>                  <button id="resizeButton">                     Resize & Compress                 </button>                 <a id="downloadButton"                     class="download-button"                     style="display: none">                     Download Compressed Image                 </a>              </div>         </div>     </div>     <script src="script.js"></script> </body>  </html>
CSS 
* {     margin: 0;     padding: 0;     box-sizing: border-box; } body {     font-family: "Segoe UI", Tahoma,         Geneva, Verdana, sans-serif;     background-color: #eefd97;     display: flex;     justify-content: center;     align-items: center;     min-height: 100vh;     margin: 0; } .container {     background-color: #eeeeee;     padding: 50px;     border-radius: 15px;     box-shadow: 0 5px 15px         rgba(0, 0, 0, 0.1);     max-width: 550px;     width: 100%; } .title {     background-color: #a0fd94;     font-size: 32px;     text-transform: uppercase;     margin-bottom: 20px; } .image-upload {     text-align: center; } .upload-label {     background-color: #007bff;     color: #fff;     padding: 15px 20px;     border-radius: 8px;     cursor: pointer;     font-size: 18px;     margin-bottom: 20px;     transition: background-color 0.3s;     box-shadow: 0 2px 5px         rgba(0, 0, 0, 0.2);     display: flex;     align-items: center;     justify-content: center; } .upload-label:hover {     background-color: #0056b3;     transform: scale(1.05); } .upload-label i {     margin-right: 8px;     font-size: 24px; } input[type="file"] {     display: none; } .output {     margin-top: 30px;     text-align: center; } .preview-label {     color: #333;     font-size: 24px;     margin-bottom: 10px; } img {     max-width: 100%;     height: auto;     display: block;     margin: 20px auto;     border: 2px solid #007bff;     border-radius: 8px;     box-shadow: 0 4px 10px         rgba(0, 0, 0, 0.2);     transition: transform 0.3s; } img:hover {     transform: scale(1.05); } .controls {     margin-top: 30px; } .control-group {     display: flex;     justify-content: space-between;     align-items: center;     margin-bottom: 20px; } label {     font-size: 20px;     font-weight: bold;     color: #333; } input[type="number"], input[type="range"], select {     width: 70%;     padding: 10px;     border: 2px solid #ccc;     border-radius: 8px;     font-size: 18px;     transition: border-color 0.3s; } input[type="number"]:focus, input[type="range"]:focus, select:focus {     border-color: #007bff; } .quality-group {     position: relative; } input[type="range"] {     width: 100%;     -webkit-appearance: none;     height: 10px;     border-radius: 8px;     background: #ccc;     outline: none;     transition: background 0.3s; } input[type="range"]::-webkit-slider-thumb {     -webkit-appearance: none;     appearance: none;     width: 20px;     height: 20px;     border-radius: 50%;     background: #007bff;     cursor: pointer;     box-shadow: 0 2px 5px         rgba(0, 0, 0, 0.2);     position: relative;     z-index: 2; } .quality-group:hover     input[type="range"] {     background: #0056b3; } .quality-value {     position: absolute;     top: -1px;     left: calc(106% - 25px);     color: #ff0000;     font-size: 18px;     background-color: rgb(         136,         223,         169     );     padding: 4px 10px;     border-radius: 6px;     box-shadow: 0 px 5px         rgba(0, 0, 0, 0.2); } button {     background-color: #007bff;     color: #fff;     border: none;     padding: 15px 30px;     cursor: pointer;     font-size: 20px;     border-radius: 8px;     transition: background-color 0.3s,         transform 0.3s;     box-shadow: 0 4px 10px         rgba(0, 0, 0, 0.2);     outline: none; } button:hover {     background-color: #0056b3;     transform: scale(1.05); } .download-button {     background-color: #0056b3;     color: #fff;     border: none;     padding: 15px 30px;     cursor: pointer;     font-size: 20px;     border-radius: 8px;     text-decoration: none;     display: inline-block;     margin-top: 20px;     transition: background-color 0.3s,         transform 0.3s;     box-shadow: 0 4px 10px         rgba(0, 0, 0, 0.2); } .download-button:hover {     background-color: #004180;     transform: scale(1.05); } #resizeUnit {     width: 60%;     font-size: 18px;     margin-right: 100px; } #pixel-dimensions, #percentage-dimensions, #pixel-height-dimensions {     display: flex;     align-items: center; } #pixel-dimensions span, #percentage-dimensions span, #pixel-height-dimensions span {     margin-left: 10px;     font-size: 18px;     color: #333; }
JavaScript 
document.addEventListener(     "DOMContentLoaded",     () => {         let imgInput =             document.getElementById("imageInput");         let imgShow =             document.getElementById("preview");         let rUnit =             document.getElementById("resizeUnit");         let rwidth =             document.getElementById("resizeWidth");         let rpercent =             document.getElementById("resizePercentage");         let dimensions =             document.getElementById("pixel-dimensions");         let perdimension =             document.getElementById("percentage-dimensions");         let pxheight =             document.getElementById(                 "pixel-height-dimensions");         let imgQuality =             document.getElementById("quality");         let qualValue =             document.getElementById("quality-value");         let resizeBtn =             document.getElementById("resizeButton");         let downloadBtn =             document.getElementById("downloadButton");         let imgDimensions =             document.getElementById("image-dimensions");         let action =             document.getElementById("action-form");         let imageResized = false;          let updateQualVal = () => {             qualValue.innerText =                 imgQuality.value;};         updateQualVal();         imgQuality.addEventListener("input",             updateQualVal);         imgInput.addEventListener(             "change",             () => {                 let imgFile =imgInput.files[0];                 let readFile = new FileReader();                 readFile.onload = (                     e                 ) => {                     imgShow.src = e.target.result;                     showActionForm();                     showImageDim(                         imgFile                     );};                 readFile.readAsDataURL(                     imgFile                 );             });         const showActionForm = () => {             action.style.display = "block";};         const showImageDim = (             imgFile         ) => {             const image = new Image();             image.onload = () => {                 const width = image.width;                 const height = image.height;                 imgDimensions.innerText =                      `Image Dimensions:                       ${width} x ${height}                       pixels`;};             image.src =                 URL.createObjectURL(                     imgFile                 );};         const dimFeildsShow = () => {             if (                 rUnit.value === "pixels"             ) {                 dimensions.style.display =                     "block";                 pxheight.style.display =                     "block";                 perdimension.style.display =                     "none";             } else {                 dimensions.style.display =                     "none";                 pxheight.style.display =                     "none";                 perdimension.style.display =                     "block";             }};         rUnit.addEventListener(             "change",             dimFeildsShow);         const updateDimensions = () => {             if (                 rUnit.value === "pixels"             ) {                 imgDimensions.innerText =                      `Image Dimensions:                       ${rwidth.value} x                       ${resizeHeight.value}                       pixels`;             } else {                 const percentage =                     parseInt(                         rpercent.value                     );                 if (                     !isNaN(percentage)                 ) {                     const width =                         (imgShow.width *                             percentage) / 100;                     const height =                         (imgShow.height *                             percentage) / 100;                     imgDimensions.innerText =                      `Image Dimensions:                       ${Math.round(width)} x                       ${Math.round(height)}                       pixels`;                 }}};         resizeBtn.addEventListener(             "click",             () => {                 if (imageResized) {                     return;                 }                 let wid;                 let height;                 if (                     rUnit.value ===                     "percentage"                 ) {                     const percentage =                         parseInt(                             rpercent.value                         );                     if (                         isNaN(                             percentage                         ) ||                         percentage <                         1 ||                         percentage > 100                     ) {                         alert(                             `Please enter a valid                               percentage (1-100).`                         );                         return;}                     wid =                         (imgShow.width *                             percentage) / 100;                     height =                         (imgShow.height *                             percentage) / 100;                     rwidth.value = wid;                     resizeHeight.value = height;                 } else {                     wid = parseInt(                         rwidth.value                     );                     height = parseInt(                         resizeHeight.value                     );                 }                 let imageQuality =                     parseInt(                         imgQuality.value) / 100;                 let canvas =                     document.createElement(                         "canvas");                 let ctx =                     canvas.getContext(                         "2d");                 let imageObj =                     new Image();                 imageObj.onload =                     () => {                         canvas.width =                             wid;                         canvas.height =                             height;                         ctx.drawImage(                             imageObj,                             0, 0, wid, height);                         let resizedDataUrl =                             canvas.toDataURL(                                 "image/jpeg",                                 imageQuality                             );                         let resizedImage =                             new Image();                         resizedImage.src =                             resizedDataUrl;                         imgShow.src =                             resizedDataUrl;                         downloadBtn.style.display =                             "inline-block";                         downloadBtn.href =                             resizedDataUrl;                         downloadBtn.download =                             "compressed-image.jpg";                         updateDimensions();                         imageResized = true;                     };                 imageObj.src =                     imgShow.src;             });});

Output:


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Build a Spy Number Checker using HTML CSS and JavaScript

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      In this article, we will build a password generator application using HTML, CSS, and JavaScript. This application will generate strong and secure passwords based on user preferences, such as password length and character types. It aims to provide a convenient tool for users to generate random passwo
      3 min read
    • Create a Sortable and Filterable Table using JavaScript
      In this article, we will demonstrate how to create a sortable and filtrable table using JavaScript. This custom table will have the functionality of editing or removing individual items along with sorting and filtering items according to different fields. Also, a form is attached so that the user ca
      6 min read

    JS Projects: Web and Landing Pages

    • Create a Bookmark Landing Page using HTML CSS and JavaScript
      In this article, we are going to implement a Bookmark Landing Page using HTML, CSS, and JavaScript. Users can effortlessly add, manage, and remove bookmarks, resulting in a tidy digital library for their favorite websites. Bookmarking the Landing Page refers to a web page or website where the users
      5 min read
    • How to create a Landing page using HTML CSS and JavaScript ?
      A landing page, also referred to as a lead capture page, static page, or destination page, serves a specific purpose and typically appears as a result of online advertising or search engine optimization efforts. Unlike a homepage, a landing page is stripped of distractions and focuses on capturing v
      7 min read
    • How to make own Linktree using HTML, CSS and JavaScript ?
      Linktree is a tool that permits you to share multiple hyperlinks of various social media into one site. It gained popularity on Instagram, as Instagram does not allow you to share web links anywhere other than Stories and the 'bio' section of your profile page, which has a strict character limit. In
      5 min read
    • Create a Responsive Admin Dashboard using HTML CSS and JavaScript
      An Admin Panel typically has several sections that enable the administrator to manage and control various activities on a website. The layout usually consists of a header and a sidebarnavigation bar, which allows the admin to easily navigate between the various sections of the panel. In the header,
      9 min read

    JS Projects: Visualizers and Effects

    • Create a Stack Visualizer using HTML CSS and Javascript
      In this article, we will see how to create a stack visualizer using HTML, CSS & Javascript, along with understanding its implementation through the illustration. Stack is a well-known linear data structure that may follow the order LIFO(Last In First Out) or FILO(First In Last Out). There are ma
      9 min read
    • How to Design a Simple Calendar using JavaScript?
      We will Create a calendar using HTML, CSS, and JavaScript that displays the current month and year, and allows the user to navigate to previous and next months. Also, it allows the user to jump to a specific month and year. The calendar should also highlight the current date. Prerequisites: HTMLCSSJ
      5 min read
    • Create an Analog Clock using HTML, CSS and JavaScript
      Designing an analog clock is an excellent project to enhance your web development skills. This tutorial will guide you through creating a functional analog clock that displays the current time using HTML, CSS, and JavaScript. What We’re Going to CreateWe will develop a simple analog clock that shows
      5 min read
    • How to Design Digital Clock using JavaScript?
      Clocks are useful elements for any UI if used in a proper way. Clocks can be used on sites where time is the main concern like some booking sites or some apps showing arriving times of trains, buses, flights, etc. We will learn to make a digital clock using HTML, CSS, and JavaScript. ApproachCreate
      2 min read
    • How to Create Image Gallery using JavaScript?
      An Image Gallery is a collection of images displayed in a grid or slideshow format on a webpage. To create an Image Gallery using JavaScript, you can dynamically load images, create HTML elements, and use CSS for styling. JavaScript can add interactivity, like transitions and navigation controls. He
      3 min read
    • Creating a Simple Image Editor using JavaScript
      In this article, we will be creating a Simple Image Editor that can be used to adjust the image values like brightness, contrast, hue, saturation, grayscale, and sepia. Image editors allow one to quickly edit pictures after they have been captured for enhancing them or completely changing their look
      10 min read
    • How to randomly change image color using HTML CSS and JavaScript ?
      In this article, we will create a webpage where we can change image color randomly by clicking on the image using HTML, CSS, and JavaScript. The image color will change randomly using the JavaScript Math random() function. Approach: First of all select your image using HTML <img> tag.In JavaSc
      2 min read
    • Create your own Lorem ipsum using HTML CSS and JavaScript
      In this article, we are going to implement a Lorem Ipsum Generator Application through HTML, CSS, and JavaScript. Lorem Ipsum, a placeholder text commonly utilized in the printing and typesetting industry, serves to visually represent a document's layout instead of relying on meaningful content. Fin
      5 min read
    • Star Rating using HTML CSS and JavaScript
      Star rating is a way to give a rating to the content to show its quality or performance in different fields. This article will demonstrate how to create a star rating project using JavaScript. Output Preview:PrerequisitesHTMLCSSJavaScriptApproachCreate the basic structure using HTML entities, divs,
      3 min read
    • Design a Simple Counter Using HTML CSS and JavaScript
      Creating a counter application with click tracking is a great beginner-friendly project to enhance your understanding of JavaScript, HTML, and CSS. In this article, we will guide you through building a basic counter app where you can increment or decrement a value, track the number of clicks, and re
      4 min read
    • Design Background color changer using HTML CSS and JavaScript
      Background color changer is a project which enables to change the background color of web pages with ease. There are color boxes on a web page when the user clicks on any one of them, then the resultant color will appear in the background of the web page. It makes web pages look attractive. File str
      3 min read
    • How to create Expanding Cards using HTML, CSS and Javascript ?
      Creating expanding cards using HTML, CSS, and JavaScript involves creating a set of cards that expand when clicked. ApproachSelection of Sections:The code starts by selecting all HTML elements with the class 'section' using the document.querySelectorAll('.section') method.This creates a NodeList con
      2 min read
    • Design a Responsive Sliding Login & Registration Form using HTML CSS & JavaScript
      In this article, we will see how to create the Responsive Sliding Login & Registration Form using HTML CSS & JavaScript, along with understanding its implementation through the illustration. Many websites, nowadays, implement sliding login & registration forms for their sites. A Registra
      5 min read

    JS Projects: Search and API Integration

    • How to Create a GitHub Profile Search using HTML CSS and JavaScript ?
      In this article, we will be developing an interactive GitHub Profile Search application using HTML, CSS, and JavaScript Language. In this application, there is a search bar where users can enter the username that they want to view. After entering the username, an API call is been triggered, and the
      4 min read
    • Create a Wikipedia Search using HTML CSS and JavaScript
      In this article, we're going to create an application, for searching Wikipedia. Using HTML, CSS, and JavaScript, users will be able to search for articles on Wikipedia and view the results in a user interface. When the user inputs the search text into the textbox, the search result for the same will
      3 min read
    • How to create Sentence Translator using HTML, CSS, and JavaScript ?
      In this article, we are going to make a sentence translator app with the help of API using JavaScript. Basic setup: Open VS Code and open a folder from your drive where you want to create this project and give the name Translate-Sentence(folderName). After opening create the following files: index.h
      3 min read
    • Search Bar using HTML CSS and JavaScript
      Every website needs a search bar through which a user can search the content of their concern on that page. We're going to learn how to create one using only HTML, CSS, and JavaScript. Instead of getting into complex algorithms for finding related content, we'll focus on a basic task—searching for s
      3 min read

    JS Projects: Generators and Tools

    • How to create Hex color generator using HTML CSS and JavaScript?
      Hex color codes are six-digit combinations representing the amount of red, green, and blue (RGB) in a color. These codes are essential in web design and development for specifying colors in HTML and CSS. The hex color generator provides the hex code for any selected color, making it a valuable tool
      2 min read
    • Create a Emoji Generator Using HTML CSS & JavaScript
      While communicating with our friends, we always use the emoji to represent our feelings and emojis. There are many emojis that represent our emotions and feelings. As developers, we can generate a random emoji on every click of the button, and we can also copy that emoji and paste it into our chat b
      7 min read
    • Create an QR Code Generator Project using HTML CSS & JavaScript
      In today's digital world, QR codes are widely used and provide a practical way to share information and access content with a quick scan. This deeply manually operated will show you step-by-step how to create a QR code generator from scratch using HTML, CSS, and JavaScript. This article will give yo
      3 min read
    • Create a QR Code Scanner or Reader in HTML CSS & JavaScript
      In this article, we will see how we can implement a QR Code Scanner with the help of HTML CSS & JavaScript. A QR code scanner will provide the user with two options to scan the QR code either by uploading the image file of the URL to be scanned or by using the camera of your system to scan the Q
      3 min read
    • Create a Coin Flip using HTML, CSS & JavaScript
      We will display the styled INR coin to the user and there will be a styled button (Toss Coin). We will create the entire application structure using HTML and style the application with CSS classes and properties. Here, JavaScript will be used to manage the behavior of the Coin Flip and will be used
      4 min read
    • Create a Resize and Compress Images in HTML CSS & JavaScript
      While using the GeeksforGeeks Write Portal to write articles, we need to upload the images. As we need to resize the image as per GeeksforGeeks's requirement, we search for different tools and websites on the internet to resize and compress the image. But, as a web developer, we can create our own i
      7 min read

    JS Projects: Miscellaneous

    • Build a Spy Number Checker using HTML CSS and JavaScript
      In the realm of mathematics, Spy Numbers, also known as secretive numbers or cryptic numbers, possess a unique property. A spy number is defined as a number whose sum of digits is equal to the product of its digits. In this article, we will explore how to build a Spy Number Checker using HTML, CSS,
      3 min read
    • How to create Pay Role Management Webpage using HTML CSS JavaScript ?
      In this article, we are going to make a Pay Role Management webpage with Javascript. In this project, we are going to learn and clear the concepts of basic javascript. Prerequisites: The pre-requisites for this project are- ES6 JavaScriptQuery SelectorsApproach: To create our Pay Role Management web
      6 min read
    • How to make curved active tab in navigation menu using HTML CSS & JavaScript ?
      In this article, we will learn about the curved outside in the active tab used in the navigation menu using HTML, CSS & JavaScript. One of the most beautiful and good-looking designs of a navigation menu is the 'Curve outside in Active Tab' design. With the help of the CSS border-radius property
      6 min read
    • Implement Dark Mode in Websites Using HTML CSS & JavaScript
      Dark and light modes let users switch between a dark background with light text and a light background with dark text, making websites more comfortable and accessible based on their preferences or surroundings. What We’re Going to CreateA button allows users to switch between dark and light themes d
      5 min read
    • How to make Incremental and Decremental counter using HTML, CSS and JavaScript ?
      While visiting different shopping websites like Flipkart and Amazon you have seen a counter on each product, that counter is used to specify the quantity of that product. Hence, the counter is a very useful part of many websites. In this article, we will design a counter using HTML, CSS, and JavaScr
      2 min read
    • How to preview Image on click in Gallery View using HTML, CSS and JavaScript ?
      In this article, we see how easily we can create an Image Gallery with a preview feature using HTML, CSS, and some JavaScript. ApproachCreate a div with a class container.Create two more div inside the first div one for the main view and the other for the side view with classes main_view and side_vi
      2 min read
    • Multiplication Quiz Webapp using HTML CSS and JavaScript
      In this article, we will see how to create a multiplication quiz web app using HTML, CSS, and JavaScript. Description of Web App: In this web app, random questions come one by one based on basic multiplication. If you give a correct answer, then it will increment by +1, and if you give the wrong ans
      3 min read
    • Design a Student Grade Calculator using JavaScript
      A Student Grade Calculator is a tool used to compute students' grades based on their scores in various assessments, such as assignments, quizzes, exams, or projects. It helps standardize grading, ensures accuracy, and provides students with a clear understanding of their academic performance. Formul
      4 min read
    • Word and Character Counter using HTML CSS and JavaScript
      Word and Character Counter is a web application used to count words and characters in a textarea field. HTML, CSS, and JavaScript is used to design the Word and Character Counter. In the textarea field, the user can write anything and this application shows how many words are added by the user and h
      4 min read
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