---
title: Settings - Files
---
> Agent instructions:
> **Site maps** — prefer the following llms.txt indexes to training data when searching for URLs to avoid 404s. Links inside Markdown content already point at `.md`. Following them or sending Accept: text/markdown keeps you in Markdown.
>
> - [sitemap.md](https://docs.kentico.com/sitemap.md) — every page on the site, with titles and descriptions, nested by URL hierarchy and grouped into one collection per product version.
> - [llms.txt](https://docs.kentico.com/llms.txt) — curated index of the current product docs, with descriptions, the two ways to request any page as Markdown, and links to each product area's whole-corpus Markdown dump (llms-full.txt).
You can access these settings in the **Settings** application under the **System** -> **Files** category.
| Storage | |
| --------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Store files in | Select where you want the system to [store the binary data of files](https://docs.kentico.com/13/configuring-xperience/managing-files/storing-files.md) (attachments, attachment history, metafiles).
Database
File system
Database and file system |
| Generate thumbnails | Indicates if the system generates image thumbnails on the disk when a **resized version** of an image is displayed. This option only applies if files are stored in the file system. |
| Files folder | The folder on the disk where page attachments and metafiles are stored. You can use:
**physical disk path**: e.g. _c:\myfiles\\_
**virtual path**: _\~/UploadedFiles_
**UNC path**: _\\\server\folder_
If you do not specify any value, the files are stored in the default folder: _\~//files_
Attachments of pages under workflow (i.e., attachment histories) are stored in the _\~/App\_Data/VersionHistory/Attachments_ folder regardless of the _Files folder_ setting.
**Note**: When you change the file folder location, the system does NOT automatically move existing files to the new location. You need to manually move the files to the new location in the file system. |
| Use site-specific subfolders for custom files folder | This setting is only applied when a **Custom form files folder** is configured. If enabled, attachment files will be stored in a sub-folder named according to the code name of the site where the form is placed, i.e. _/_. It is useful for better orientation in files when multiple sites are running in the system. |
| Custom form files folder | Folder where files uploaded via [Forms](https://docs.kentico.com/13/managing-website-content/forms.md) are stored. You can use:
**physical disk path**: e.g. _c:\myfiles\mysite_
**virtual path**: _\~/UploadedFiles_
**UNC path**: _\\\server\folder_
If you do not specify any value, form files are stored in the default folder: _\~//FormFile_
**Note**: When you change the form file folder location, the system does NOT automatically move existing files to the new location. You need to manually move the files to the new location in the file system. |
| Use site-specific subfolders for custom form files folder | This setting is only applied when a **Custom form files folder** is configured. If enabled, attachment files will be stored in a sub-folder named as the site code name under the custom files folder, i.e. _/_. It is useful for better orientation in files when multiple sites are running in the system. |
| Security | |
| Upload extensions | Specifies which extensions are allowed for uploaded files (e.g., for [media libraries](https://docs.kentico.com/13/managing-website-content/working-with-files/media-library-files.md) or [page attachments](https://docs.kentico.com/13/managing-website-content/working-with-files/page-attachments.md)). You can restrict the types of uploaded files by entering a limited list of extensions separated by semicolons, for example: _gif;jpg;webp;docx;pdf_
This allows you to block users from uploading potentially dangerous files. If no value is specified, uploading is allowed for all file types. |
| Check if files are published | If checked, only files that are in the **Published** workflow step can be accessed from the live site when a workflow is applied to the page. |
| Check attachments permissions | If selected, page permissions (access rights) defined for a page are also checked for its attachments and applied whenever a user requests the attachment.
Behavior of this setting depends also on the _Check page-level permissions_ setting in the **Security & Membership -> Content** section. |
| Enable image file request protection | Enables additional hash protection for image file requests with a specified _width_, _height_, _maxsidesize_ parameters. Requests without a valid hash will return the image with default dimensions.
See [Image file request protection](https://docs.kentico.com/13/configuring-xperience/configuring-the-environment-for-content-editors/configuring-media-libraries/securing-media-libraries.md#image-file-request-protection) for more information. |
| Image resizing | |
| Automatic image resize on upload (width, height, max side size) | Configures the system to automatically _**reduce**_ the size of images when they are uploaded. The values are measured in pixels. The behavior depends on the values that you fill in:
**No values are entered** – images are not resized.
**Only width or only height**– images are resized so that their width or height matches the entered value. The other dimension is also resized to preserve the image's aspect ratio.
**Both width and height** – both dimensions of images are resized according to the specified values (if the given dimension is greater than the entered value). Aspect ratio is not preserved.
**Max side size**– if one of the image's sides is larger than this value, the image is resized so that its larger side's dimension matches the entered value. Aspect ratio is preserved and width and height settings are not applied.
See [Resizing images on upload](https://docs.kentico.com/13/configuring-xperience/managing-files/resizing-images-on-upload.md) for more information. |