Content Specifications

Images

  • Save images as PNG or JPG files.
  • Remove spaces and special characters from file names.
In order to display on devices, images must have the following specifications:
  • Color must be RGB.
  • JPG images must be at least of quality 4 out of 10 or 40 out of 100 (the scale depends on your editing program).
  • Transparent alpha layers are not allowed.
  • File size must be less than 10 MB.
Best practices:
  • Keep your image dimensions under 2,000,000 total pixels (height times width must be less 2,000,000 px).
  • Transparent alpha layers will display as black on devices. Change the transparency to a solid white.
  • Most devices will scale images to fit the height or width of the screen.
    • To have images take up an entire page on most devices, use dimensions of 600 x 800 pixels.
    • To prevent the Kindle from scaling up small images, use dimensions less than 260 x 311 pixels.

Covers

  • Save cover images as PNG files.
  • Dimensions of 1600 px x 2400 px are recommended.
  • Use a high-resolution image to future-proof your content for high-definition or retina devices.

Videos

In order to play on devices, video must have the following specifications:
  • MP4 file extension.
  • H.264 compression.
  • Frame size of:
    • 640 x 360 pixels or 480 x 270 pixels for a 16:9 aspect ratio.
    • 640 x 480 pixels or 480 x 360 pixels for a 4:3 aspect ratio.
  • Audio encoded at 256-320 kbps in AAC. (320 kbps recommended.)
  • One black frame at the beginning and end.
  • File size less than 70 MB.

Poster Images

  • Every video must have a poster image.
  • Save your poster images as PNG files.
  • Use the same dimensions as your video.

Audio

In order to play on devices, audio must have the following specifications:
  • MP3 file extension.
  • AAC compression.
  • 256-320 kbps bit rate. (320 kbps recommended.)
  • 8 – 48 kHz sampling rate.
  • Stereo, not mono, sound.

Word Documents

  • Mark your section titles with Microsoft Word’s “Title” style.
  • Images will be imported where they were placed.
  • Remove headers, footers, page numbers, and tables of contents.
  • Divide Word documents larger than 70 MB into 2-3 smaller files.
  • Save your tables as images.