Convert CAVS to MKV Files Online for Free.

Q: Will RunConvert mess up my video’s aspect ratio?

A: Nope, we keep it just as it is—unless you decide to change it yourself during conversion.

Q: Will subtitles stay synced after conversion?

A: If they’re embedded, yes. If they’re external (like .srt), they might need re-syncing.

Q: What’s the best format for YouTube uploads?

A: YouTube prefers MP4 with H.264 video and AAC audio. It’s like their native language.

Q: Is it safe to use RunConvert on public Wi-Fi?

A: We use HTTPS encryption, so your files are secure—even if you're sipping a latte at the airport café.

Q: How long does it take to convert a video?

A: Usually just a few seconds for short clips. Bigger files take longer, but our servers are fast. You’ll be done before you know it.

Q: What’s the difference between MKV and MP4?

A: MKV is super flexible and supports subtitles and multiple audio tracks. MP4 is lighter and more universal. Think of MKV as the Swiss army knife, MP4 as the crowd-pleaser.

Q: How can I make my video smaller without ruining the quality?

A: Choose a lower resolution and use MP4 with H.264—it keeps the balance between size and quality.

Q: How do I convert a corrupted video file?

A: We can’t fix broken files (yet), but if it’s playable, we can usually convert it.

Q: Can I change the audio format too?

A: Yes—you can convert the audio along with the video or extract it separately as MP3, WAV, etc.

Q: How do I convert video for an Android device?

A: MP4 is your friend here—works like a charm across all Android versions.