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# Cover
Covers are used for all the ebook formats, and to make books more elegant on GitBook.com.
To provide a cover, place a **cover.jpg** file at the root directory of your book. Adding a **cover_small.jpg** will specify a smaller version of the cover. The cover should be a **JPEG** file.
### Best Sizes
| | Big | Small |
|:-------------------:|:-----------:|:-----------------:|
| **File** | `cover.jpg` | `cover_small.jpg` |
| **Size(in pixels)** | 1800x2360 | 200x262 |
### Guidelines
A good cover respects the following guidelines:
* No border
* Clearly visible book title
* Any important text should be visible in the small version
### Autocover
A GitBook plugin (`autocover`) can also be used to automatically generate a cover file, or just create a `cover_small.jpg` from a `cover.jpg`. This plugin is added by default on hosted books.
[Read more about autocover](https://github.com/GitbookIO/plugin-autocover).
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