Visit Tumblr and sign in to your account. Click the “Gear” icon and choose the blog you want to edit. In the Theme section, click “Customize.”
Click “Upload” next to Header Image in the Appearance section, if your theme offers this option. Locate a file on your computer and click “Upload” to set the image as your blog’s title. Image files can be in any format but must be less than 5MB.
Visit the file upload page on Tumblr if your theme doesn’t include an upload button (link in Resources). This page is strictly reserved for Tumblr theme assets, and uploading any other type of file can result in your account being banned. Click “Choose File” and locate the image file on your computer, then click “Upload.”
Copy the file’s URL from the text box that is displayed when the file is uploaded. Paste the copied text into a blank text file to save it for the next step or simply keep it stored in the clipboard. Alternatively, leave the file upload page open in a separate browser tab while editing your Tumblr theme.
Return to your blog’s Customize page and click “Edit HTML.” Press “Ctrl-F” to open the Find and Replace window, then type “{Title}” (without the outer quotes) in the Find box. Within the body of HTML tag, select the curly braces and the word “Title” they surround and replace the selection with the following line of code:
<img src=“File URL”>
Substitute the URL you copied in the previous step for File URL, ensuring that the URL is enclosed in quotes and the entire line of code is enclosed in angle brackets. For example, if your URL is “http://static.tumblr.com/tlvhi6n/7ktmju69t/file.png," insert the following line of code within the HTML tag:
Click “Update Preview” to view your header image. Save your changes by clicking “Save.” Return to your account page by clicking “Exit” and view your updated blog page by selecting the blog from your main account menu.
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