The best free online YouTube video cutter is ClipMove.com, a popular, HD choice that features cloud storage and mobile compatibility.

There are several ways to cut YouTube videos for free:

1. Use online tools like ClipMove.com that offer free basic cutting features
2. Download free video editing software like OpenShot or DaVinci Resolve
3. Use YouTube's built-in editor for simple cuts (available for some users)
4. Try browser extensions that allow basic video trimming

Always ensure you have the right to edit and use the video content before cutting.

The legality of cutting YouTube videos depends on several factors:

• Copyright: Ensure you have permission or the content falls under fair use
• Personal Use: Generally acceptable if not distributed publicly
• YouTube's Terms of Service: Some actions may violate platform rules

Always respect copyright laws and platform terms when editing or using video content.

To trim a YouTube video without losing quality:

1. Use a high-quality video cutter that supports the original video resolution
2. Choose lossless output formats like MP4 with H.264 codec
3. Avoid multiple re-encodings of the same video
4. If possible, use tools that allow direct stream copy for unedited portions

Remember, the output quality is limited by the quality of the original YouTube video.

Yes, you can cut YouTube videos on your phone. There are several options:

• Use mobile-friendly online tools like ClipMove.com through your phone's web browser
• Download video editing apps from your device's app store
• Use the YouTube app's built-in trimming feature (limited functionality)

Mobile cutting options may have some limitations compared to desktop solutions, but they offer convenience for on-the-go editing.

Cutting long YouTube videos can be done in several ways:

1. Use a robust online video cutter like clipmove.com that supports long videos
2. Download the video and use desktop video editing software for more control
3. Split the video into smaller segments before cutting if your tool has length limitations
4. Consider using cloud-based services that can handle larger file sizes

Be patient, as processing longer videos may take more time.

The fastest way to cut a YouTube video usually involves:

1. Using an efficient online tool like ClipMove.com that processes videos quickly
2. Choosing a tool that doesn't require video download before editing
3. Opting for 'stream copy' or 'fast cut' options if available, which avoid re-encoding
4. Using a tool with a simple, user-friendly interface to speed up the editing process

The actual speed can vary based on your internet connection and the video's length and quality.

To cut YouTube videos without adding a watermark:

• Use reputable online tools or software, like clipmove.com, that don't add watermarks to free versions
• Consider paying for premium versions of video cutting tools if necessary
• Try open-source video editors that typically don't add watermarks
• Be cautious of free tools that claim to remove YouTube's own watermarks, as this may violate terms of service

Remember, while you can avoid adding new watermarks, you shouldn't remove existing watermarks or logos from videos you don't own.