> For the documentation index, fetch https://sync.so/docs/llms.txt. Append .md to a page URL for Markdown. Documentation-search MCP: https://sync.so/docs/_mcp/server.

# Web Browser Support

> Learn about supported browsers, extension compatibility, and how to ensure the best video playback experience.

## Supported Browsers & Operating Systems

We officially support and test Sync Labs Studio on the latest versions of the following browsers and operating systems.

#### Web Browsers

* Chrome
* Firefox
* Safari
* Edge

#### Operating Systems

* Windows
* macOS
* Android
* iOS, iPadOS

While Sync Labs Studio might work on other browsers, operating systems, or older versions, they are not actively tested, and we cannot guarantee full functionality.

### Browser Extensions Support

Certain browser extensions can interfere with how Sync Labs Studio functions. If you encounter unexpected behavior, please check whether any of the following extensions are active.

#### Problematic Extensions

* [ModHeader](https://chromewebstore.google.com/detail/modheader-modify-http-hea/idgpnmonknjnojddfkpgkljpfnnfcklj?hl=en)
* [uBlock Origin](https://chromewebstore.google.com/detail/ublock-origin/cjpalhdlnbpafiamejdnhcphjbkeiagm?hl=en) (and other script/ad blockers)

#### Common Issues Caused

* Seeing an “Unauthorized” error even when you’re logged in.
* Missing model names in the Lipsync Settings pane.

## Output Video Playback

To ensure videos you generate with Sync Labs play back smoothly, it's important that your web browser supports the necessary video and audio formats.

> **Note**
>
> **What to do if a video doesn’t play:** If a generated video fails to play in your browser, you can download it for offline viewing. Right-click (or long-press on mobile devices) the video and select "Save video as..." to save it locally.

This guide explains our output formats and provides tools to test your browser.

### Output Formats

Sync Labs-generated videos are encoded to ensure a balance of quality, file size, and broad compatibility.

| Type          | Codec       | Details (MIME type) |
| :------------ | :---------- | :------------------ |
| **Video**     | H.264 (AVC) | `avc1.64082a`       |
| **Audio**     | AAC         | `mp4a.40.2`         |
| **Container** | MP4         | -                   |

These formats are widely supported across modern web browsers.

#### How to Test Your Browser's Compatibility

**1. Play a Sample Video**

The simplest test is to play a sample video encoded with our standard settings. If the video plays correctly, your browser is likely compatible.

* [Play Standard Quality Video (H.264/AAC)](https://test-videos.co.uk/vids/bigbuckbunny/mp4/h264/1080/Big_Buck_Bunny_1080_10s_30MB.mp4)

**2. Check MIME Type Support**

For a more technical confirmation, use these links to check for specific MIME type support. Your browser should show a green "supported" message for each.

* [Test H.264 Video Codec Support](https://cconcolato.github.io/media-mime-support/#video/mp4;%20codecs=%22avc1.64082a%22)
* [Test AAC Audio Codec Support](https://cconcolato.github.io/media-mime-support/#audio/mp4;%20codecs=%22mp4a.40.2%22)

## Troubleshooting

If you encounter issues with studio or video playback or the compatibility tests fail in your web browser, follow these steps:

1. **Update Your Browser**: Make sure you are using the latest version of your web browser.
2. **Use a Supported Browser**: Ensure you are using one of the browsers officially supported by us, as listed at the top of this page.
3. **Disable Browser Extensions**: Ad-blockers or privacy-focused extensions can cause issues. Try disabling them temporarily, or, use an Incognito or Private browser window (with extensions disabled).

> **Note**
>
> **Tip**: Keeping your browser updated is the single most effective way to ensure compatibility with modern web standards and video formats.

If you continue to experience problems, please don't hesitate to reach out to our support team.

> Learn about supported browsers, extension compatibility, and how to ensure the best video playback experience.