Summary : How to Change Logo of your SharePoint 2013 site,How to Change Logo in SharePoint 2013 Team site,Change Logo in Existing Master Page in SharePoint 2013
A Company Logo in SharePoint 2013 can be added either on the top left of the Page (replacing default Logo – see Image below) or by replacing the Text ‘SharePoint or Office 365’ displayed in the Top left in the Blue bar.
Logo on Page to Change –
If you wish to Change this logo you can either do that by using the Out-of-box Logo Options as described in steps below or by editing the Master page of your site (see the steps at How to edit an existing Master Page to Change Logo in SharePoint 2013). Lets look at the Steps to Change it using the OOB option.
1. Navigate to Site Settings Page using the Settings Wheel.
2. Select “Title, description, and logo” under Look and Feel.
3. On “Title, Description, and Logo” Page under ‘Logo and Description’, you can either Select Logo from your Local disk\Computer or from one of the Logos that you might have uploaded in one of the Libraries on your Site.
Uploading From Computer is new in SharePoint 2013.It lets you to Select the Logo from your Computer that gets added to Site Asserts Library by default.
If you want to Change the Text in Top left (Blue Bar) with your Companies Logo you can follow Change ‘SharePoint’ in top left bar in SharePoint 2013 with Logo
Original article : Here