devdunia/base64-decoder.html at main · echobash/devdunia · 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">
    <link rel="icon" type="image/png" href="images/logo.png">
    <link rel="apple-touch-icon" href="images/logo.png">
    <title>Base64 Decoder - Developer Toolkit | DevDunia</title>
    <meta name="description" content="Decode Base64 encoded data back to original format. Free online Base64 decoder tool for developers.">
    <script src="https://cdn.tailwindcss.com"></script>
    <style>
        body {
            background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
        }
    </style>
</head>
<body class="h-screen lg:ml-72">
    <!-- Background: Consistent Subtle Dark Gradient -->
    <div class="fixed inset-0 -z-10 bg-gradient-to-br from-gray-900 via-slate-900 to-gray-900"></div>

    <!-- Main Container -->
    <div class="main-content">
        <div class="relative z-10 container mx-auto px-4 pt-16 pb-24 sm:px-6 lg:px-8">

        <!-- Page Header -->
        <div class="text-center mb-12">
            <h1 class="text-3xl sm:text-4xl font-bold mb-4 tracking-tight
                       text-transparent bg-clip-text bg-gradient-to-r from-blue-400 to-cyan-500">
                Base64 Decoder
            </h1>
            <p class="text-lg text-gray-400 max-w-2xl mx-auto">
                Decode Base64 encoded data back to original format.
            </p>
        </div>

        <!-- Tool Container -->
        <div class="max-w-4xl mx-auto">
            <div class="bg-slate-800/70 backdrop-blur-md rounded-lg shadow-lg border border-slate-700/60 p-6">

                <!-- Input Section -->
                <div class="mb-6">
                    <label for="base64-input" class="block text-sm font-medium text-gray-300 mb-2">
                        Input Base64 Data
                    </label>
                    <textarea
                        id="base64-input"
                        rows="6"
                        class="w-full px-4 py-3 bg-slate-700/50 border border-slate-600 rounded-lg text-gray-200 placeholder-gray-400 focus:outline-none focus:ring-2 focus:ring-blue-500 focus:border-transparent resize-none font-mono text-sm"
                        placeholder="Enter Base64 encoded data to decode..."
                    ></textarea>
                </div>

                <!-- Action Buttons -->
                <div class="flex flex-wrap gap-3 mb-6">
                    <button id="decode-btn" class="px-6 py-3 bg-blue-600 hover:bg-blue-700 text-white font-medium rounded-lg transition-colors duration-200 flex items-center space-x-2">
                        <svg class="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M17 8l4 4m0 0l-4 4m4-4H3"></path>
                        </svg>
                        <span>Decode Base64</span>
                    </button>

                    <button id="clear-btn" class="px-6 py-3 bg-slate-600 hover:bg-slate-700 text-white font-medium rounded-lg transition-colors duration-200 flex items-center space-x-2">
                        <svg class="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M19 7l-.867 12.142A2 2 0 0116.138 21H7.862a2 2 0 01-1.995-1.858L5 7m5 4v6m4-6v6m1-10V4a1 1 0 00-1-1h-4a1 1 0 00-1 1v3M4 7h16"></path>
                        </svg>
                        <span>Clear All</span>
                    </button>
                </div>

                <!-- Error Display -->
                <div id="error-display" class="hidden mb-6 p-4 bg-red-900/50 border border-red-600/50 rounded-lg">
                    <div class="flex items-center space-x-2">
                        <svg class="w-5 h-5 text-red-400" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 8v4m0 4h.01M21 12a9 9 0 11-18 0 9 9 0 0118 0z"></path>
                        </svg>
                        <span id="error-message" class="text-red-300"></span>
                    </div>
                </div>

                <!-- Output Section -->
                <div id="output-section" class="hidden">
                    <label for="base64-output" class="block text-sm font-medium text-gray-300 mb-2">
                        Decoded Output
                    </label>
                    <div class="relative">
                        <textarea
                            id="base64-output"
                            rows="8"
                            class="w-full px-4 py-3 bg-slate-700/50 border border-slate-600 rounded-lg text-gray-200 focus:outline-none focus:ring-2 focus:ring-blue-500 focus:border-transparent resize-none font-mono text-sm"
                            readonly
                        ></textarea>

                        <!-- Copy Button -->
                        <button id="copy-btn" class="absolute top-2 right-2 px-3 py-1 bg-slate-600 hover:bg-slate-700 text-white text-sm rounded transition-colors duration-200 flex items-center space-x-1">
                            <svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M8 16H6a2 2 0 01-2-2V6a2 2 0 012-2h8a2 2 0 012 2v8a2 2 0 01-2 2h-2m-6-4l2 2m0 0l2-2m-2 2V10"></path>
                            </svg>
                            <span>Copy</span>
                        </button>
                    </div>

                    <!-- Stats -->
                    <div class="mt-3 flex flex-wrap gap-4 text-sm text-gray-400">
                        <div class="flex items-center space-x-2">
                            <span>Base64 Size:</span>
                            <span id="base64-size" class="text-blue-400 font-medium">0 B</span>
                        </div>
                        <div class="flex items-center space-x-2">
                            <span>Decoded Size:</span>
                            <span id="decoded-size" class="text-green-400 font-medium">0 B</span>
                        </div>
                        <div class="flex items-center space-x-2">
                            <span>Compression:</span>
                            <span id="compression" class="text-purple-400 font-medium">0%</span>
                        </div>
                        <div class="flex items-center space-x-2">
                            <span>Padding:</span>
                            <span id="padding" class="text-yellow-400 font-medium">0 chars</span>
                        </div>
                    </div>
                </div>

                <!-- Examples Section -->
                <div class="mt-8 p-4 bg-slate-700/30 rounded-lg border border-slate-600/50">
                    <h3 class="text-lg font-semibold text-cyan-400 mb-3">Common Examples</h3>
                    <div class="grid grid-cols-1 md:grid-cols-2 gap-4 text-sm">
                        <div>
                            <p class="text-gray-300 font-medium mb-2">Simple text:</p>
                            <p class="text-gray-400">"SGVsbG8gV29ybGQ="</p>
                            <p class="text-gray-500">→ "Hello World"</p>
                        </div>
                        <div>
                            <p class="text-gray-300 font-medium mb-2">Binary data:</p>
                            <p class="text-gray-400">"SGVsbG8="</p>
                            <p class="text-gray-500">→ [0x48, 0x65, 0x6C, 0x6C, 0x6F]</p>
                        </div>
                        <div>
                            <p class="text-gray-300 font-medium mb-2">JSON data:</p>
                            <p class="text-gray-400">"eyJuYW1lIjoiSm9obiIsImFnZSI6MzB9"</p>
                            <p class="text-gray-500">→ {"name": "John", "age": 30}</p>
                        </div>
                        <div>
                            <p class="text-gray-300 font-medium mb-2">File content:</p>
                            <p class="text-gray-400">Long Base64 string</p>
                            <p class="text-gray-500">→ Image files, PDFs, etc.</p>
                        </div>
                    </div>
                </div>

            </div>
        </div>

    </div>
       <!-- Footer include -->
    <div id="footer"></div>
    <script>
    fetch("footer.html")
    .then(response => response.text())
    .then(data => {
        document.getElementById("footer").innerHTML = data;
    })
    .catch(err => console.error("Failed to load footer:", err));
    </script>


    <script>
        document.addEventListener('DOMContentLoaded', function() {
            const base64Input = document.getElementById('base64-input');
            const base64Output = document.getElementById('base64-output');
            const decodeBtn = document.getElementById('decode-btn');
            const clearBtn = document.getElementById('clear-btn');
            const copyBtn = document.getElementById('copy-btn');
            const outputSection = document.getElementById('output-section');
            const errorDisplay = document.getElementById('error-display');
            const errorMessage = document.getElementById('error-message');
            const base64Size = document.getElementById('base64-size');
            const decodedSize = document.getElementById('decoded-size');
            const compression = document.getElementById('compression');
            const padding = document.getElementById('padding');

            // Decode Base64
            decodeBtn.addEventListener('click', function() {
                const input = base64Input.value.trim();
                if (!input) {
                    showError('Please enter Base64 data to decode');
                    return;
                }

                try {
                    // Remove any whitespace and validate Base64
                    const cleanInput = input.replace(/\s/g, '');
                    if (!isValidBase64(cleanInput)) {
                        throw new Error('Invalid Base64 string');
                    }

                    const decoded = atob(cleanInput);
                    base64Output.value = decoded;
                    showOutput();
                    updateStats(cleanInput, decoded);
                    hideError();
                } catch (error) {
                    showError('Error decoding from Base64: ' + error.message);
                    hideOutput();
                }
            });

            // Clear all
            clearBtn.addEventListener('click', function() {
                base64Input.value = '';
                hideOutput();
                hideError();
            });

            // Copy output
            copyBtn.addEventListener('click', function() {
                base64Output.select();
                document.execCommand('copy');

                // Visual feedback
                const originalText = copyBtn.innerHTML;
                copyBtn.innerHTML = '<svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M5 13l4 4L19 7"></path></svg><span>Copied!</span>';
                copyBtn.classList.add('bg-green-600');

                setTimeout(() => {
                    copyBtn.innerHTML = originalText;
                    copyBtn.classList.remove('bg-green-600');
                }, 2000);
            });

            // Auto-resize input
            base64Input.addEventListener('input', function() {
                this.style.height = 'auto';
                this.style.height = this.scrollHeight + 'px';
            });

            // Helper functions
            function showOutput() {
                outputSection.classList.remove('hidden');
            }

            function hideOutput() {
                outputSection.classList.add('hidden');
            }

            function showError(message) {
                errorMessage.textContent = message;
                errorDisplay.classList.remove('hidden');
            }

            function hideError() {
                errorDisplay.classList.add('hidden');
            }

            function isValidBase64(str) {
                try {
                    return btoa(atob(str)) === str;
                } catch (err) {
                    return false;
                }
            }

            function updateStats(base64, decoded) {
                const base64Bytes = new Blob([base64]).size;
                const decodedBytes = new Blob([decoded]).size;
                const compressionPercent = ((base64Bytes - decodedBytes) / base64Bytes * 100).toFixed(1);

                // Calculate padding characters
                const paddingChars = base64.match(/=+$/);
                const paddingCount = paddingChars ? paddingChars[0].length : 0;

                base64Size.textContent = formatBytes(base64Bytes);
                decodedSize.textContent = formatBytes(decodedBytes);
                compression.textContent = compressionPercent + '%';
                padding.textContent = paddingCount + ' chars';
            }

            function formatBytes(bytes) {
                if (bytes === 0) return '0 B';
                const k = 1024;
                const sizes = ['B', 'KB', 'MB', 'GB'];
                const i = Math.floor(Math.log(bytes) / Math.log(k));
                return parseFloat((bytes / Math.pow(k, i)).toFixed(2)) + ' ' + sizes[i];
            }

            // Example Base64 on page load
            window.addEventListener('load', () => {
                base64Input.value = 'SGVsbG8gRnJvbSBFY2hvYmFzaCE=';
            });
        });
    </script>
        </div>
    </div>

    <!-- Include Final Sidebar -->
    <div id="sidebar-container"></div>
    <script>
        // Load final_sidebar.html content
        fetch('final_sidebar.html')
            .then(response => response.text())
            .then(html => {
                document.getElementById('sidebar-container').innerHTML = html;
            })
            .catch(error => {
                console.error('Error loading sidebar:', error);
            });
    </script>
</body>
</html>