A permalink (or permanent link) is a URL that points to a specific blog entry after it has passed from the front page to the archives.Blogger generates this permanent link based on your post title(If the title is in English). For example if your post title is “Hello World”, the blog post’s permalink would be something. Till date Blogger never allowed the user to control what the permalink should be but it rather assigned a permalink on it’s own.

This has now changed and Blogger now allows you to decide what the permalink of your new post should be.

Setup Custom Permalink for a new Blog Post

1. Login to your Blogger account and compose a new post. On the Right side of the post editor, you will have a Post Settings Section. Click on the Permlink sub-section
   
   
2. If you select the “Automatic URL” (the default option), then Blogger will generate the permalink on it’s own. If you want to specify a custom URL, opt for the “Custom URL” option and you can enter your custom post permalink over there. It will allow you to enter alphabets, hyphens and underscores. It will just ignore underscores. So I just used a combination of hyphens and alphabets to create my post permalink
   
 
3. The Final Permalink will be something like
   the custom URL that you specified
   In my case it came to something like
   

   custom-permanent-link.html

4. Now just publish the post like how you normally do
   

Can I alter Permalinks of Old Posts?

Blogger doesn’t allow you to modify the Permalinks of old posts but you can make use of this new feature on your new posts  There seems to be no limit to the length of this Custom URL at the moment but Blogger might impose some length limit in future.