How to Add Watermark Overlays in HTML5 Video

element can be used to render video frames along with overlays. This method composites the video and watermark into a single canvas output. Example: Drawing Watermark on Canvas

const video = document.getElementById('video'); const canvas = document.getElementById('canvas'); const ctx = canvas.getContext('2d'); const watermarkText = '© 2025 CompanyName'; video.addEventListener('play', function () { const draw = () => { if (video.paused || video.ended) return; ctx.drawImage(video, 0, 0, canvas.width, canvas.height); ctx.font = '20px Arial'; ctx.fillStyle = 'rgba(255, 255, 255, 0.5)'; ctx.fillText(watermarkText, canvas.width - 180, canvas.height - 30); requestAnimationFrame(draw); }; draw(); }); Explanation: The video frame is drawn onto the canvas on each animation frame while playing. The watermark text is overlaid on the video frame at the bottom-right corner. The semi-transparent white text is visible but does not obstruct video content significantly. This approach allows dynamic watermarks and integration of timestamps or user info if required. Considerations and Limitations CSS overlays are non-destructive and cannot prevent screen capture or downloading but provide visible branding. Canvas-based watermarking requires duplicating the video rendering and may introduce slight performance overhead. Ensure watermark opacity and placement do not interfere with important visual content. Watermarks added purely through HTML and CSS can be disabled by users via browser developer tools.

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