Use Local HTML CSS Animations as OBS Background

Using a local HTML file with CSS animations is a lightweight, highly customizable way to add dynamic, high-performance backgrounds to your OBS Studio streams. This guide will walk you through preparing a basic HTML/CSS file, importing it into OBS Studio using the Browser Source, and configuring the settings to ensure smooth, hardware-accelerated playback without impacting your system’s performance.

Step 1: Prepare Your HTML and CSS File

Before opening OBS, you need an HTML file that contains your CSS animation. Ensure that both the HTML and CSS are self-contained in one file, or that the CSS stylesheet is properly linked relatively.

Here is a simple template for a dynamic background. Save this code as background.html on your computer:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>OBS Dynamic Background</title>
    <style>
        body {
            margin: 0;
            padding: 0;
            overflow: hidden;
            background: #1e1e24;
            height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
        }

        /* Example CSS Animation */
        .animated-circle {
            width: 300px;
            height: 300px;
            background: linear-gradient(45deg, #ff007f, #7f00ff);
            border-radius: 50%;
            filter: blur(50px);
            animation: pulse 6s infinite alternate ease-in-out;
        }

        @keyframes pulse {
            0% { transform: scale(1) translate(-50px, -50px); }
            100% { transform: scale(1.5) translate(50px, 50px); }
        }
    </style>
</head>
<body>
    <div class="animated-circle"></div>
</body>
</html>

Step 2: Add a Browser Source in OBS Studio

OBS Studio uses an integrated Chromium browser to render web-based content, which allows it to run HTML and CSS animations natively.

  1. Launch OBS Studio.
  2. Go to the Sources dock at the bottom of the screen.
  3. Click the + (Add) icon and select Browser from the dropdown menu.
  4. Name the source (e.g., “Dynamic HTML Background”) and click OK.

Step 3: Configure the Browser Source Settings

To display the local file correctly, adjust the properties window that appears:

  1. Check the box labeled Local file.
  2. Click the Browse button next to the Local file path field, navigate to your saved background.html file, and select it.
  3. Set the Width and Height to match your OBS canvas resolution (typically 1920 for width and 1080 for height).
  4. (Optional) Clear any text inside the Custom CSS text area at the bottom of the properties window if you want to rely entirely on your HTML file’s internal styling.
  5. Click OK.

Step 4: Optimize for Performance

Animations rendered in real-time can consume CPU cycles. To ensure the background runs smoothly without lagging your stream or game:

  1. Go to Settings in OBS Studio.
  2. Select the Advanced tab.
  3. Under the Sources section, check the box for Enable Browser Source Hardware Acceleration.
  4. Click Apply and restart OBS Studio if prompted.
  5. In the Browser Source properties, you can also check Limit framerate when invisible to save system resources when switching to scenes where the background is not active.