tools/b64-encode.html at main · mathspp/tools · 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>Base64 Encoder</title>
    <link rel="stylesheet" href="styles.css">
    <style>
        :root {
            color-scheme: light dark;
        }

        body {
            max-width: 960px;
            margin: 0 auto;
            padding: clamp(1.5rem, 3vw, 2.5rem) clamp(1rem, 2.5vw, 2.5rem) clamp(3rem, 4vw, 4rem);
        }

        header {
            margin-bottom: clamp(1.5rem, 3vw, 2.25rem);
        }

        h1 {
            font-size: clamp(1.9rem, 3.2vw, 2.6rem);
            margin-bottom: 0.35rem;
            color: var(--tx);
        }

        p.lead {
            margin: 0;
            color: var(--tx-2);
            font-size: clamp(1rem, 2.3vw, 1.15rem);
        }

        main {
            display: grid;
            gap: 1.25rem;
        }

        .tool-card {
            padding: clamp(1.25rem, 2.5vw, 1.75rem);
        }

        form {
            display: grid;
            gap: 0.75rem;
        }

        textarea {
            width: 100%;
            min-height: 160px;
            resize: vertical;
        }

        .tool-actions {
            display: flex;
            gap: 0.75rem;
            flex-wrap: wrap;
        }

        .status {
            font-size: 0.95rem;
            color: var(--tx-3);
        }

        .output-card h2 {
            margin-top: 0;
            margin-bottom: 0.35rem;
        }

        .output-help {
            margin: 0 0 0.5rem;
            color: var(--tx-3);
            font-size: 0.96rem;
        }

        @media (max-width: 720px) {
            body {
                padding: 20px 16px 40px;
            }

            textarea {
                min-height: 140px;
            }
        }
    </style>
</head>

<body>
    <header class="page-header">
        <a class="site-link" href="https://tools.mathspp.com/" aria-label="Back to tools.mathspp.com">← tools.mathspp.com</a>
        <h1>Base64 Encoder</h1>
        <p class="lead">Paste any text, encode it to Base64, and quickly copy the result.</p>
    </header>

    <main>
        <section class="surface tool-card">
            <form id="encode-form">
                <label for="input-text">Text to encode</label>
                <textarea id="input-text" name="input-text" placeholder="Paste or type content here"></textarea>

                <div class="tool-actions">
                    <button type="submit">Encode to Base64</button>
                    <button type="button" id="clear-button" class="secondary">Clear</button>
                </div>
                <p class="status" id="status-message" aria-live="polite"></p>
            </form>
        </section>

        <section class="surface tool-card output-card" aria-live="polite">
            <h2>Base64 output</h2>
            <p class="output-help">The encoded text appears below. Copy it to your clipboard.</p>
            <textarea id="output-text" readonly placeholder="Your Base64 text will appear here"></textarea>
            <div class="tool-actions">
                <button type="button" id="copy-button" class="secondary">Copy to clipboard</button>
            </div>
        </section>
    </main>

    <script>
        (function () {
            const form = document.getElementById('encode-form');
            const inputText = document.getElementById('input-text');
            const outputText = document.getElementById('output-text');
            const copyButton = document.getElementById('copy-button');
            const statusMessage = document.getElementById('status-message');
            const clearButton = document.getElementById('clear-button');

            function encodeBase64(text) {
                const bytes = new TextEncoder().encode(text);
                let binary = '';
                const chunkSize = 0x8000;

                for (let i = 0; i < bytes.length; i += chunkSize) {
                    const chunk = bytes.subarray(i, i + chunkSize);
                    binary += String.fromCharCode(...chunk);
                }

                return btoa(binary);
            }

            function setStatus(message) {
                statusMessage.textContent = message;
            }

            function handleEncode(event) {
                event.preventDefault();
                try {
                    const value = inputText.value || '';
                    const encoded = encodeBase64(value);
                    outputText.value = encoded;
                    setStatus('Encoded successfully.');
                } catch (error) {
                    outputText.value = '';
                    setStatus('Unable to encode this content.');
                    console.error(error);
                }
            }

            function handleCopy() {
                if (!outputText.value) {
                    setStatus('Nothing to copy yet.');
                    return;
                }

                navigator.clipboard.writeText(outputText.value).then(() => {
                    const originalText = copyButton.textContent;
                    copyButton.textContent = 'Copied!';
                    copyButton.classList.add('copied');
                    setStatus('Copied to clipboard.');

                    setTimeout(() => {
                        copyButton.textContent = originalText;
                        copyButton.classList.remove('copied');
                    }, 1500);
                }).catch(() => {
                    outputText.select();
                    document.execCommand('copy');
                    setStatus('Copied to clipboard.');
                });
            }

            function handleClear() {
                inputText.value = '';
                outputText.value = '';
                setStatus('');
                inputText.focus();
            }

            form.addEventListener('submit', handleEncode);
            copyButton.addEventListener('click', handleCopy);
            clearButton.addEventListener('click', handleClear);
        })();
    </script>

    <footer class="page-footer">
        <p>Built with ❤️, 🤖, and 🐍, by <a href="https://mathspp.com/">Rodrigo Girão Serrão</a></p>
    </footer>
</body>

</html>