A custom URL provides a shorter, easy-to-remember URL that you can share with your audience. Custom URLs are assigned to qualifying channels and can be based on your current display name, your legacy username or your linked and verified web domain.
ID-Based URL
Example: youtube.com/channel/UCUZHFZ9jIKrLroW8LcyJEQQ
Custom URL
Example: youtube.com/c/YouTubeCreators and youtube.com/YouTubeCreators
Legacy Username
Example: youtube.com/user/partnersupport
The URL options you can select from are based on things like your display name, your YouTube username, any current vanity URLs that you have or the name of your linked website. Sometimes, you may need to customise the URL by adding letters and numbers to make it unique to you.
Important: You can’t change your custom URL after you create it, so make sure that you are comfortable with your choice before you finalize it.
To get a custom URL for your channel, your account needs to be in good standing and meet a few other requirements:
Once you've qualified for a custom URL, you’ll receive an email notification and a notification on your Creator Studio dashboard. To get your customized URL:
Sign in to Google+. Place your cursor in the top-left corner for the Google + main menu and then select the page or profile associated with your channel.
Click the About tab and under Links > Google+ URL, click Edit.
A box will appear allowing you to edit the formatting.
Note:- Remember, you can only change the capitalization and diacritics of the URL, not the URL itself.