SharePoint 2013 Supports editing Custom HTTP 404 Error Pages in SharePoint 2013. In
this post we will take a deep look how to create a new 404 page and set
it as default for a site collection.
Default PageNotfound\404 page - By default, all the Publishing sites contain a default Error\404 page “PageNotFoundError.aspx” page which is added to the “Pages” library (See below).

This page can be edited simpy by opening the page editing it.
“Error Page” Content Type - To allow users to Create a new 404 Error page, Publishing Sites now contain a new Content Type “Error Page“.This Content type Inherits from “Page” Content type and has a typical layout of a Page Not found or 404 pages. To find this Content type Navigate to Site Settings -> Content Types -> Error Page.

Create a New PageNotFound or 404 Page – To Create a new 404 page admins can navigate to the “Pages” Library and under the “Files tab” select “New Document”.In the “New Document” drop-down menu select “Error Page” (see the screen below).


Once you have Created a new Error Page you can modify it by simply clicking the page in the pages library and editing it.

Once done Check In and Publish the page.
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Default PageNotfound\404 page - By default, all the Publishing sites contain a default Error\404 page “PageNotFoundError.aspx” page which is added to the “Pages” library (See below).
This page can be edited simpy by opening the page editing it.
“Error Page” Content Type - To allow users to Create a new 404 Error page, Publishing Sites now contain a new Content Type “Error Page“.This Content type Inherits from “Page” Content type and has a typical layout of a Page Not found or 404 pages. To find this Content type Navigate to Site Settings -> Content Types -> Error Page.
Create a New PageNotFound or 404 Page – To Create a new 404 page admins can navigate to the “Pages” Library and under the “Files tab” select “New Document”.In the “New Document” drop-down menu select “Error Page” (see the screen below).
Once you have Created a new Error Page you can modify it by simply clicking the page in the pages library and editing it.
Once done Check In and Publish the page.
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