Build a Simple Text Analyzer Tool with HTML, CSS, and JavaScript

Submitted by oretnom23 on Thursday, June 19, 2025 - 11:54.

In this tutorial, we'll walk through the step-by-step process of building a Simple Text Analyzer Tool using HTML, CSS, and JavaScript. This guide is designed to help beginners understand how to create a practical and useful web application using only these core web technologies.

What is Text Analyzer Tool?

A Text Analyzer Tool Application is a software solution designed to analyze and interpret written content. It automatically identifies key information, language patterns, and statistical insights to help users gain a deeper understanding of their text. This tool enhances content quality by examining linguistic structure, grammar, or metrics.

How Does the Text Analyzer Tool Work?

In this tutorial, I will guide you through building a simple yet powerful Text Analyzer Tool using HTML, CSS, and JavaScript. This lightweight web application includes a user-friendly text area where users can type or paste any content they want to evaluate. Once the user clicks the "Analyze" button, the tool instantly processes the input and displays useful insights. These include the total number of characters (excluding spaces), the total word count, and the average word length. This tool is perfect for students, writers, and content creators who want to check their writing stats quickly and efficiently without any complex setup or login. It's a great way to improve readability and content quality with just a click.

Technologies Used

Below are the essential technologies and tools we'll use to develop the Text Analyzer Tool. These are simple and widely accessible, making this project beginner-friendly and easy to follow:

HTML (HyperText Markup Language): Used to structure the web page and define the text input area.
CSS (Cascading Style Sheets): Applied to style the layout, fonts, and design of the application.
JavaScript: Handles the logic for analyzing the text and displaying the results.
Text Editor: A code editor like Sublime Text, Notepad++, or Visual Studio Code is needed to write and manage the HTML, CSS, and JavaScript code.
Web Browser: Any modern browser (such as Chrome, Firefox, or Edge) is used to run and test the Text Analyzer Tool.

Let's start the coding...

Steps to Build the Text Analyzer Tool

Step 1: Creating the Interface Structure

To begin, create a new HTML file and name it index.html. This file will contain the foundational structure of your Text Analyzer Tool. Using HTML, you will set up the basic layout of the page, including a text area where users can enter or paste their content, an "Analyze" button to trigger the analysis, and output containers to display the results such as word count, character count, and average word length. This step lays the groundwork for the user interface of the application.

Check out the following HTML script that I provided below:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Text Analyzer App</title>
    <link rel="stylesheet" href="style.css">
    <script src="script.js"></script>
</head>
<body>
    <!-- Main App Wraooer -->
    <div id="main">
        <!-- Page/App Title -->
        <h1 id="app-title"><strong>Text Analyzer App</strong></h1>
        <!-- Main Wrapper -->
        <div id="wrapper">
            <!-- Text and Result Container -->
            <div id="container">
                <!-- Result -->
                <div id="result-container">
                    <div>Characters: <span id="character-count">0</span></div>
                    <div>Words: <span id="word-count">0</span></div>
                    <div>Average: <span id="awl">0</span></div>
                </div>
                <!-- Text Field -->
                <textarea name="" id="text-field" rows="7" placeholder="Enter or Paste your text here."></textarea>
            </div>
            <!-- Analyze Button -->
            <button type="button" id="analyzeBtn">Analyze</button>
        </div>
    </div>
</body>
</html>

Step 2: Styling the User Interface

The next step is to create a new CSS (Cascading Style Sheets) file named style.css. This file will define the visual design and layout of your Text Analyzer Tool. Using CSS, you will style elements such as the text area, analyze button, and result containers to make the interface clean, user-friendly, and visually appealing. Good styling enhances both the usability and overall user experience of the application.

@import url('https://fonts.googleapis.com/css2?family=Ubuntu+Sans+Mono:ital,wght@0,400..700;1,400..700&display=swap');
 
/* General */
* {
    box-sizing: border-box;
    font-family: "Ubuntu Sans Mono", monospace;
    font-optical-sizing: auto;
    font-style: normal;
}
 
html,
body {
    width: 100%;
    height: 100%;
    margin: unset;
    padding: unset;
}
 
body {
    background-color: #5AB2FF;
}
 
/* Main App Container */
#main {
    display: flex;
    flex-flow: column wrap;
    width: 100%;
    height: 100%;
    align-items: center;
    justify-content: center;
}
 
/* App Title Element */
#app-title {
    text-align: center;
    color: #fff;
    text-shadow: 0px 3px 3px #0000002b;
}
 
/* Field Wrapper */
#wrapper {
    width: 100%;
    max-width: 350px;
    padding: 20px 15px;
    border-radius: 5px;
    background-color: #A0DEFF;
    box-shadow: 2px 3px 5px #00000043;
}
 
/* Text and Result Container */
#container {
    position: relative;
}
 
div#result-container {
    position: absolute;
    display: flex;
    width: 100%;
    justify-content: center;
    align-items: center;
    grid-gap: 5px;
    bottom: 18px;
}
 
div#result-container>div {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 150px;
    min-width: 50px;
    font-size: 12px;
    background-color: #e7f2fd;
    border-radius: 50px;
    padding: 5px 15px;
    color: #97bee4;
    text-shadow: 1px 2px 3px #00000047;
}
 
/* Textarea Field */
#text-field {
    width: 100%;
    resize: none;
    outline: none;
    border: 1px solid #85858524;
    box-shadow: 2px 3px 5px #0000003b;
    margin-bottom: 20px;
    border-radius: 5px;
    padding: 10px 10px 24px;
    color: #737070;
}
 
/* Analyze Button */
button#analyzeBtn {
    width: 100%;
    padding: 10px;
    font-size: 15px;
    font-weight: bolder;
    letter-spacing: .3px;
    background-color: #5AB2FF;
    color: #fff;
    border: unset;
    border-radius: 5px;
    cursor: pointer;
}
 
button#analyzeBtn:hover,
button#analyzeBtn:active {
    background-color: #4292d8;
}

Step 3: Adding Functionality with JavaScript

Finally, create a new JavaScript file and name it script.js. This file will handle the functionality of your Text Analyzer Tool. Specifically, it will include the JavaScript code that makes the "Analyze" button work. When a user clicks the button, an event listener will be triggered, which processes the text input from the user. The script will calculate and display the total number of characters (excluding spaces), word count, and the average word length. This step brings your application to life by enabling real-time text analysis based on user input.

var TextField;
var wordCountEL;
var CharCountEL;
var AWLEL;
var AnalyzeButton;
 
document.addEventListener("DOMContentLoaded", function(){
    /* Initializing Elements */
    TextField = document.getElementById("text-field");
    wordCountEL = document.getElementById("word-count");
    CharCountEL = document.getElementById("character-count");
    AWLEL = document.getElementById("awl");
    AnalyzeButton = document.getElementById("analyzeBtn");
 
    /** Adding an Event Listener for Analyze Button when clicked */
    AnalyzeButton.addEventListener("click", function(e){
        e.preventDefault();
        // Retrieving the Entered Text from the Text Field
        var text = TextField.value;
        // Counting the Words in text
        var words = text.trim().split(/\s+/).length;
        // Counting the Characters in text
        var characters = text.trim().replace(/\s+/g, "").length;
        // Computing the Average Word length
        var awl = (characters / words).toFixed(2);
 
 
        // Output the Word Count Result
        wordCountEL.innerText = words;
        // Output the Character Count Result
        CharCountEL.innerText = characters;
        // Output the Average Word length
        AWLEL.innerText = awl;
 
    })
})

Note: the style.css and script.js must be loaded in the index.html.

There you have it! You can now test the script we've just built. To do this, simply open the index.html file in your web browser. Try entering some text and click the "Analyze" button to check if the Text Analyzer Tool functions as expected—displaying the character count, word count, and average word length accurately.

Snapshots

Here are the images taken from the Text Analyzer Tool Application using the scripts that I provided above.

Page Layout

Simple Text Analyzer Tool with HTML, CSS, and JavaScript

Text Field and Output