tools/video-to-gif.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>Video to GIF</title>
    <link rel="stylesheet" href="styles.css">
    <style>
        body {
            max-width: 960px;
            margin: 0 auto;
            padding: 24px 20px 56px;
        }

        header {
            margin-bottom: 1.25rem;
        }

        main {
            display: grid;
            gap: 1.5rem;
        }

        .panel {
            padding: clamp(1.25rem, 3vw, 2rem);
        }

        .drop-zone {
            border: 2px dashed var(--color-border, #d0d7de);
            border-radius: 12px;
            padding: 32px 20px;
            text-align: center;
            cursor: pointer;
            transition: border-color 0.2s ease, background-color 0.2s ease;
        }

        .drop-zone input {
            display: none;
        }

        .drop-zone.dragover {
            border-color: var(--color-accent, #0070f3);
            background-color: rgba(0, 112, 243, 0.08);
        }

        .drop-zone p {
            margin: 0.35rem 0 0;
            color: var(--color-muted, #57606a);
        }

        .controls-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 1rem;
        }

        .form-group {
            display: flex;
            flex-direction: column;
            gap: 0.35rem;
        }

        .status-text {
            min-height: 1.25rem;
            color: var(--color-muted, #57606a);
        }

        .status-text.error {
            color: #b42318;
        }

        .progress-bar {
            width: 100%;
            background: #f4f6f8;
            border-radius: 8px;
            height: 10px;
            overflow: hidden;
        }

        .progress-bar span {
            display: block;
            height: 100%;
            width: 0%;
            background: linear-gradient(90deg, #0070f3, #5b8def);
            transition: width 0.2s ease;
        }

        .file-info {
            display: flex;
            flex-wrap: wrap;
            gap: 0.5rem 1.5rem;
            color: var(--color-muted, #57606a);
        }

        .preview {
            width: 100%;
            max-height: 320px;
            border-radius: 10px;
            background: #0f172a08;
            display: grid;
            place-items: center;
            padding: 1rem;
        }

        video {
            max-width: 100%;
            max-height: 300px;
            border-radius: 10px;
        }

        @media (max-width: 640px) {
            body {
                padding: 18px 16px 48px;
            }
        }
    </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>Video to GIF</h1>
        <p class="lead">Drop a video and convert it to a GIF directly in your browser. Nothing is uploaded to a server.</p>
    </header>

    <main>
        <section class="surface panel">
            <div class="drop-zone" tabindex="0" role="button" aria-label="Upload video" id="drop-zone">
                <strong>Drop your video here</strong>
                <p>or click to choose a file</p>
                <input type="file" accept="video/*" id="video-input" aria-label="Upload video">
            </div>
            <p class="status-text" id="status-text">No video loaded yet.</p>
            <div class="preview" aria-live="polite" id="preview" hidden>
                <video controls muted></video>
            </div>
        </section>

        <section class="surface panel" aria-live="polite">
            <h2>Conversion</h2>
            <div class="file-info" id="file-info" hidden>
                <span id="file-name"></span>
                <span id="file-size"></span>
                <span id="file-duration"></span>
            </div>
            <div class="controls-grid">
                <div class="form-group">
                    <label for="fps">Frame rate (FPS)</label>
                    <input type="number" id="fps" min="1" max="30" value="10" inputmode="numeric">
                </div>
                <div class="form-group">
                    <label for="max-width">Max width (px)</label>
                    <input type="number" id="max-width" min="64" max="1280" value="640" inputmode="numeric">
                </div>
            </div>
            <div class="tool-actions" style="margin-top: 1rem;">
                <button type="button" id="convert-btn" disabled>Convert to GIF</button>
                <button type="button" id="reset-btn">Reset</button>
            </div>
            <div class="progress-bar" aria-hidden="true" hidden id="progress-bar">
                <span id="progress-inner"></span>
            </div>
            <p class="status-text" id="conversion-status"></p>
            <div class="tool-actions">
                <button type="button" id="download-btn" disabled>Download GIF</button>
            </div>
        </section>
    </main>

    <script type="module">
        const ffmpegVersion = '0.12.10';
        const ffmpegModuleURL = `https://cdnjs.cloudflare.com/ajax/libs/ffmpeg/${ffmpegVersion}/esm/index.min.js`;
        const ffmpegUtilURL = `https://cdnjs.cloudflare.com/ajax/libs/ffmpeg/${ffmpegVersion}/esm/utils.min.js`;

        const { FFmpeg } = await import(ffmpegModuleURL);
        const { fetchFile, toBlobURL } = await import(ffmpegUtilURL);

        (function () {
            const dropZone = document.getElementById('drop-zone');
            const fileInput = document.getElementById('video-input');
            const statusText = document.getElementById('status-text');
            const previewWrapper = document.getElementById('preview');
            const previewVideo = previewWrapper.querySelector('video');
            const convertBtn = document.getElementById('convert-btn');
            const resetBtn = document.getElementById('reset-btn');
            const downloadBtn = document.getElementById('download-btn');
            const fpsInput = document.getElementById('fps');
            const maxWidthInput = document.getElementById('max-width');
            const fileInfo = document.getElementById('file-info');
            const fileNameEl = document.getElementById('file-name');
            const fileSizeEl = document.getElementById('file-size');
            const fileDurationEl = document.getElementById('file-duration');
            const progressBar = document.getElementById('progress-bar');
            const progressInner = document.getElementById('progress-inner');
            const conversionStatus = document.getElementById('conversion-status');

            const ffmpegBaseURL = `https://cdn.jsdelivr.net/npm/@ffmpeg/core@${ffmpegVersion}/dist/umd`;

            let loadedFile = null;
            let gifBlob = null;
            let ffmpeg = null;
            let ffmpegReady = false;
            let previewUrl = null;
            let ffmpegUtils = null;

            async function safeUnlink(path) {
                if (!ffmpegReady) return;
                try {
                    if (typeof ffmpeg.deleteFile === 'function') {
                        await ffmpeg.deleteFile(path);
                    } else if (ffmpeg.FS) {
                        ffmpeg.FS('unlink', path);
                    }
                } catch (error) {
                    // Ignore missing files
                }
            }

            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 `${(bytes / Math.pow(k, i)).toFixed(1)} ${sizes[i]}`;
            }

            function setStatus(message, isError = false) {
                statusText.textContent = message;
                statusText.classList.toggle('error', isError);
            }

            function setConversionStatus(message, isError = false) {
                conversionStatus.textContent = message;
                conversionStatus.classList.toggle('error', isError);
            }

            function toggleDropZoneHighlight(active) {
                dropZone.classList.toggle('dragover', active);
            }

            function reset() {
                if (previewUrl) {
                    URL.revokeObjectURL(previewUrl);
                    previewUrl = null;
                }

                loadedFile = null;
                gifBlob = null;
                fileInput.value = '';
                convertBtn.disabled = true;
                downloadBtn.disabled = true;
                previewWrapper.hidden = true;
                previewVideo.removeAttribute('src');
                previewVideo.load();
                fileInfo.hidden = true;
                progressBar.hidden = true;
                progressInner.style.width = '0%';
                setStatus('No video loaded yet.');
                setConversionStatus('');
            }

            async function ensureFFmpeg() {
                if (ffmpegReady) return;
                ffmpeg = new FFmpeg();
                ffmpegUtils = { fetchFile, toBlobURL };

                ffmpeg.on('log', ({ message }) => {
                    console.log(message);
                });

                ffmpeg.on('progress', ({ progress, ratio }) => {
                    const value = Number.isFinite(progress) ? progress : (Number.isFinite(ratio) ? ratio : 0);
                    updateProgress(value);
                });

                setConversionStatus('Loading FFmpeg core (~31 MB)…');

                await ffmpeg.load({
                    coreURL: await ffmpegUtils.toBlobURL(`${ffmpegBaseURL}/ffmpeg-core.js`, 'text/javascript'),
                    wasmURL: await ffmpegUtils.toBlobURL(`${ffmpegBaseURL}/ffmpeg-core.wasm`, 'application/wasm'),
                });

                ffmpegReady = true;
            }

            function updateFileInfo(file, durationSeconds) {
                fileNameEl.textContent = `Name: ${file.name}`;
                fileSizeEl.textContent = `Size: ${formatBytes(file.size)}`;
                fileDurationEl.textContent = durationSeconds ? `Duration: ${durationSeconds.toFixed(1)}s` : '';
                fileInfo.hidden = false;
            }

            function updateProgress(ratio) {
                const percent = Math.min(100, Math.round(ratio * 100));
                progressInner.style.width = `${percent}%`;
                progressBar.hidden = false;
                setConversionStatus(`Processing… ${percent}%`);
            }

            function deriveOutputName(inputName) {
                const withoutExt = inputName.replace(/\.[^.]+$/, '');
                return `${withoutExt}.gif`;
            }

            async function convertToGif() {
                if (!loadedFile) return;
                convertBtn.disabled = true;
                downloadBtn.disabled = true;
                progressInner.style.width = '0%';
                progressBar.hidden = false;
                setConversionStatus('Preparing conversion…');

                try {
                    await ensureFFmpeg();

                    const inputName = loadedFile.name;
                    const outputName = deriveOutputName(inputName);
                    const data = await ffmpegUtils.fetchFile(loadedFile);

                    // Clean previous files if any
                    await safeUnlink(inputName);
                    await safeUnlink(outputName);

                    await ffmpeg.writeFile(inputName, data);

                    const fps = Math.max(1, Math.min(Number(fpsInput.value) || 10, 30));
                    const maxWidth = Math.max(64, Math.min(Number(maxWidthInput.value) || 640, 1280));

                    const vf = `fps=${fps},scale=${maxWidth}:-1:flags=lanczos`;
                    await ffmpeg.exec(['-i', inputName, '-vf', vf, '-loop', '0', outputName]);

                    const outputData = await ffmpeg.readFile(outputName);
                    gifBlob = new Blob([outputData.buffer], { type: 'image/gif' });

                    const downloadName = outputName;
                    downloadBtn.dataset.filename = downloadName;
                    setConversionStatus('GIF ready!');
                    downloadBtn.disabled = false;

                    await safeUnlink(inputName);
                    await safeUnlink(outputName);
                } catch (error) {
                    console.error(error);
                    setConversionStatus(error.message || 'Conversion failed.', true);
                } finally {
                    convertBtn.disabled = !loadedFile;
                    progressBar.hidden = false;
                }
            }

            function handleDownload() {
                if (!gifBlob) return;
                const url = URL.createObjectURL(gifBlob);
                const a = document.createElement('a');
                a.href = url;
                a.download = downloadBtn.dataset.filename || 'output.gif';
                document.body.appendChild(a);
                a.click();
                a.remove();
                setTimeout(() => URL.revokeObjectURL(url), 0);
            }

            function handleFiles(files) {
                const file = files[0];
                if (!file) return;

                if (previewUrl) {
                    URL.revokeObjectURL(previewUrl);
                }

                previewUrl = URL.createObjectURL(file);
                previewVideo.src = previewUrl;
                previewVideo.load();
                previewWrapper.hidden = false;

                setStatus('Video ready. Click convert to create a GIF.');
                loadedFile = file;
                gifBlob = null;
                convertBtn.disabled = false;
                downloadBtn.disabled = true;
                setConversionStatus('');
                progressBar.hidden = true;
                progressInner.style.width = '0%';

                previewVideo.onloadedmetadata = () => {
                    updateFileInfo(file, previewVideo.duration);
                };
            }

            dropZone.addEventListener('click', () => fileInput.click());
            dropZone.addEventListener('keydown', (event) => {
                if (event.key === 'Enter' || event.key === ' ') {
                    event.preventDefault();
                    fileInput.click();
                }
            });

            dropZone.addEventListener('dragover', (event) => {
                event.preventDefault();
                toggleDropZoneHighlight(true);
            });

            dropZone.addEventListener('dragleave', () => toggleDropZoneHighlight(false));
            dropZone.addEventListener('drop', (event) => {
                event.preventDefault();
                toggleDropZoneHighlight(false);
                handleFiles(event.dataTransfer.files);
            });

            fileInput.addEventListener('change', (event) => {
                handleFiles(event.target.files);
            });

            convertBtn.addEventListener('click', convertToGif);
            downloadBtn.addEventListener('click', handleDownload);
            resetBtn.addEventListener('click', reset);

            reset();
        })();
    </script>

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

</html>