- 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:
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- 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:
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- 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.
- 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.
- In order to play on devices, video must have the following specifications:
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- 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.
- Every video must have a poster image.
- Save your poster images as PNG files.
- Use the same dimensions as your video.
- In order to play on devices, audio must have the following specifications:
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- MP3 file extension.
- AAC compression.
- 256-320 kbps bit rate. (320 kbps recommended.)
- 8 – 48 kHz sampling rate.
- Stereo, not mono, sound.
- 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.