How to Make Tumblr Photos in a Text Post Fit With the Border of the Themeby Tammy Columbo
Most Tumblr themes support photos up to 500 pixels wide with a height of up to 700 pixels in the standard text post view. However, you can upload a larger image that your users can view by clicking on the original image in a Photo post. The larger version of the image can be up to 1280 pixels wide and 1920 pixels tall. Crop your photo to 500 pixels wide or less to ensure the photo fits within the theme border.
Crop or resize the image to 500 x 700 pixels or smaller. Save the image as a JPG, GIF, PNG or BMP file.
Log in to your Tumblr dashboard, then click the “Text” post icon to open the New Text Post form.
Type an optional title for the post in the Title box, then type a message in the text box.
Click the “Camera” icon to open the Photo Upload dialog box.
Browse to and click the photo file, then click “Open” to upload the photo to the text post form.
Click the “Post” button to publish the post.
Even though images 500 pixels wide and less display full size to visitors and followers, the image displays as a smaller version in your dashboard. Click the image to view the full-sized photo seen by users.