Youtube-editor -

Changes are applied directly to the published video, and a preview window allows for review before finalization. Important Considerations:

The editor is not ideal for complex editing,, and for unedited videos with over 100,000 views, saving changes may be restricted (excluding blurring). youtube-editor

Allows users to cut out sections from the beginning, end, or middle of a video. Changes are applied directly to the published video,

For monetized channels, the editor allows for the adjustment of ad breaks. youtube-editor

It is best used for "emergency surgery" on published content to avoid having to delete and re-upload the video.

Access the editor through YouTube Studio by selecting 'Content' and choosing the 'Editor' option on the left menu.