The Twenty Fifteen Theme

The Twenty Fifteen theme at WordPress Codex

"Twenty Fifteen is the default theme for WordPress in 2015. It is super-clean, content-focused, and designed to bring a little more simplicity to our blogs. Its careful attention to typography, featuring the expertly-designed Noto font set in elegant and harmonious margins, makes it beautiful in multiple languages around the world."

Twenty Fifteen at the WordPress.com Themes Directory

Twenty Fifteen's simple, straightforward typography is readable on a wide variety of screen sizes, and suitable for multiple languages. We designed it using a mobile-first approach, meaning your content takes center-stage, regardless of whether your visitors arrive by smartphone, tablet, laptop, or desktop computer.

Twenty Fifteen at the WordPress.org Themes Directory

and the Twenty Fifteen Support Forum

(NOTE: this is at WordPress.org where you can edit the backend – so some of the solutions do not apply if you are using it at wordpress.com)

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Twenty Fifteen Image Specs

Quick Specs for images:

  1. The main content width is 660px
  2. The sidebar width is 248px
  3. Featured Images are 825px wide by 510px high
  4. Recommended header size of 954 × 1300 pixels
"Only .jpeg, .gif, and .png files can be used for images in WordPress. All cropped images will be converted to jpegs. Using an image of exactly the right size will produce the best results, and this is certainly recommended. To preserve transparency in an image use a .gif or .png image of exactly the right size."