cpf-tools-js/validate-cpf.html at main · LuizAnunciato/cpf-tools-js · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Validate CPF</title>
    <style>
        body {
            height: 100vh;
            margin: 0;
            font-family: Arial, Helvetica, sans-serif;
            display: flex;
            justify-content: center;
            align-items: center;
            flex-direction: column;
            padding: 20px;
        }

        h1 {
            font-size: 24px;
            margin-bottom: 5px;
            text-align: center;
            font-weight: normal;
            color: #333333;
            margin-top: -5px;
        }

        p {
            font-size: 16px;
            margin-bottom: 10px;
            line-height: 1.6;
            text-align: center;
            width: 80%;
            margin-left: auto;
            margin-right: auto;
            margin-top: 0;
        }

        input {
            padding: 10px;
            font-size: 16px;
            border: 1px solid #ccc;
            border-radius: 5px;
            margin-bottom: 10px;
        }

        button {
            padding: 10px 20px;
            cursor: pointer;
            font-size: 16px;
            border: none;
            border-radius: 50px;
            background-color: #007bff;
            color: white;
            transition: background-color 0.3s ease;
        }

        button:hover {
            background-color: #0056b3;
        }

        #result {
            margin-top: 15px;
            font-size: 18px;
            font-weight: bold;
        }

        a {
            color: #007bff;
            text-decoration: none;
            margin-top: 15px;
            font-size: 14px;
        }

        a:hover {
            text-decoration: underline;
        }
    </style>
</head>
<body>
    <h1>Validate CPF</h1>

    <p>Enter a CPF below to validate it.</p>

    <input type="text" id="cpfInput" placeholder="Enter CPF (only numbers)">
    <button onclick="validateCPF()">VALIDATE</button>

    <div id="result"></div>
    <a href="index.html">Back to CPF Generator</a>

    <script>
        function validateCPF() {
            const cpf = document.getElementById("cpfInput").value;

            if (!/^\d{11}$/.test(cpf)) {
                document.getElementById("result").innerText = "Invalid CPF format. Please enter 11 digits.";
                document.getElementById("result").style.color = "red";
                return;
            }

            // Calculate the first digit
            let sum1 = 0;
            for (let i = 0; i < 9; i++) {
                sum1 += parseInt(cpf[i]) * (10 - i);
            }
            const remainder1 = (sum1 * 10) % 11;
            const digit1 = remainder1 === 10 ? 0 : remainder1;

            // Calculate the second digit
            let sum2 = 0;
            for (let i = 0; i < 10; i++) {
                sum2 += parseInt(cpf[i]) * (11 - i);
            }
            const remainder2 = (sum2 * 10) % 11;
            const digit2 = remainder2 === 10 ? 0 : remainder2;

            // Validate
            if (digit1 === parseInt(cpf[9]) && digit2 === parseInt(cpf[10])) {
                document.getElementById("result").innerText = "Valid CPF!";
                document.getElementById("result").style.color = "green";
            } else {
                document.getElementById("result").innerText = "Invalid CPF!";
                document.getElementById("result").style.color = "red";
            }
        }
    </script>
</body>
</html>