On November 6, 2013, YouTube switched to the current Google+-based comment system. That means that if you have been active on YouTube for more than a year, you probably posted comments using the old legacy comment system. Pre-Google+ comments cannot be edited, or directly replied to, but they can be deleted.
How to delete your pre-Google+ Legacy YouTube commentsYou can delete old YouTube comments from a video's "ALL COMMENTS" page, as long as you are signed in as the channel that posted the comment.
Just follow the step-by-step directions below on your desktop computer.
1. Sign into the YouTube channel that posted the comment
If you have more than one YouTube channel connected to your YouTube account, or your YouTube channel is connected to a Google+ Page, you may need to switch to the correct YouTube channel identity after signing in.
You can switch channel identities by clicking your channel icon in the upper right corner, or by going to www.youtube.com/channel_switcher and selecting your channel.
2. Open the video watch page where you originally posted the comment
To delete your comment, you first need to open the video watch page you posted the comment on on your desktop computer. There is no way to see a list of all the comments you have posted, so that means you may need to use Google search or another search engine to find your old comments.
Open the video watch page for the video you commented on, and allow the comments to load.
You will notice that if you click the down arrow to the right of your old comment on the video watch page the only option is to "Report spam or abuse" - don't report your own comment as spam!
Above the current comments for the video it will say ALL COMMENTS . Click ALL COMMENTS to open the "All comments" page (obvious, right?).
You can also open the the "All Comments" page directly if you know the video ID.
Replace the highlighted portion of this link with the correct video ID to get to the comments page:
3. On the "All Comments" page find your comment and delete it
Once you have opened the "All comments" page for the video, scroll down until you find your old comment.
Hover your cursor over the comment so that a down arrow appears on the right edge of the comment page. Note that if your browser window is too small, you may not see it - make sure the right edge of the comment page is visible.
Click the down arrow to the right of your comment to see the option to "Remove" the comment.
Select "Remove" to permanently delete your comment.
If you do not see the option to remove your comment on the All Comments page, you are probably not signed in with the correct YouTube channel.
What are your options if you can't sign in to your old channel?
If you can no longer remember how to sign in to the YouTube account that posted the comment, you can try to regain access using the Google account recovery process, starting here :
Legacy YouTube channels - channels created before May 2009 that have not been accessed since before 2011 - need to be connected to a Google account.
If you ultimately cannot sign in or remove your old comment, you can try asking the channel owner to remove your comment. The channel owner should be able to remove any comments - old or new - from their videos or channel discussion.
What about Google+ YouTube comments?
You have more options for deleting Google+ YouTube comments: you can delete then from the video watch page, from you Google+ Profile or Page, or using the YouTube or Google+ app on your phone or tablet.
Learn how to delete Google+ YouTube comments.
Posted by Peggy K
Top image: derived from Emoji u1f64a Copyright © 2014 Google. Licensed under the Apache License, Version 2.0