# Thumbnails are blurry when viewed in mobile mode.
### Why is this happening?
For best performance and to avoid wasting resources, the theme actively loads thumbnail images according to screen size:
#### -> So you need to set the \[ *Medium size* ] higher to get better picture quality when viewing on your phone.
However, with pre-existing images, you need to use an external plugin to regenerate them.
Use whichever plugin you want, our guide below uses the **Regenerate Thumbnails** plugin:
1. Install and Active [**Use Regenerate Thumbnail**](https://vi.wordpress.org/plugins/regenerate-thumbnails/)**s** plugin
2. Navigate to **Settings -> Media.**
3. On Medium size change: **Max Width** is **500px** (or bigger) and **Max Height** is **500px** (or bigger).
4. Click Save.
5. Install and Active plugin **Regenerate Thumbnails**
6. Navigate **Tools -> Regenerate Thumbnails** and click **Regenerate Thumbnails For All Attachments**
7. Good luck!
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