How Can I Convert Hex to Binary Using JavaScript With HTML?

Hello Friends Today, through this tutorial, I will tell you How to Hex to Decimal Convert Using JavaScript Without Submit Button with HTML? You can create a simple HTML page with JavaScript to convert a hexadecimal number to binary without using a submit button. Below is an example:


<!DOCTYPE html>
<html lang="en">
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Hex to Binary Converter</title>
body {
font-family: Arial, sans-serif;
margin: 20px;
label {
display: block;
margin-bottom: 8px;
input {
width: 100%;
padding: 8px;
margin-bottom: 16px;
box-sizing: border-box;
p {
margin-top: 0;
<h2>Hex to Binary Converter</h2>
<label for="hexInput">Enter Hexadecimal:</label>
<input type="text" id="hexInput" placeholder="Enter hexadecimal" oninput="convertHexToBinary()">
<p id="binaryOutput"></p>

function convertHexToBinary() {
const hexInput = document.getElementById('hexInput').value;

// Check if the input is a valid hexadecimal number
if (/^[0-9A-Fa-f]+$/.test(hexInput)) {
const binaryOutput = parseInt(hexInput, 16).toString(2);
document.getElementById('binaryOutput').innerHTML = `Binary: ${binaryOutput}`;
} else {
document.getElementById('binaryOutput').innerHTML = 'Invalid hexadecimal input';

In this example, the `convertHexToBinary` function is triggered by the `oninput` event of the input field, so it updates the binary output dynamically as the user types. The function checks whether the input is a valid hexadecimal number using a regular expression. If it is valid, it converts the hexadecimal to binary and displays the result; otherwise, it shows an error message.