---
title: URLs of resized images in media libraries
---

> 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).

When you resize an image that you inserted into a media library using a web part, the editor, or a form control, the URL of the image changes in the following way:

| Resizing image to | Resizing is done by                       | The image URL                                                                                                         |
| ----------------- | ----------------------------------------- | --------------------------------------------------------------------------------------------------------------------- |
| Larger size       | Browser (css styles)                      | The file path<br>(e.g., /Kentico/CorpSite/media/MyPictureGallery/Panda.jpg)                                           |
| No change         | None                                      | The file path<br>(e.g., /Kentico/CorpSite/media/MyPictureGallery/Panda.jpg)                                           |
| Smaller size      | Internal resizing - a new file is created | Permanent URL\*<br>(e.g., /Kentico/getmedia/ed0be744-9e70-4056-8c7d-91fc5087813c/Panda.jpg.aspx?width=100\&height=66) |

\*Learn about [configuring general media library settings](https://docs.kentico.com/k81/managing-website-content/configuring-the-environment-for-content-editors/configuring-media-libraries.md) to make the system use permanent URLs.

Every time you resize an image to a **smaller size**, the system makes a new copy of this image with this dimensions in the \_\__thumbnails_ folder, which is located in the original image's folder. The images are resized into smaller files to save bandwidth. You can override this behavior by setting the _getPermanent_ variable in the _btnImagePreview\_Click_ method within the _CMSModules\Content\Controls\Dialogs\Properties\HTMLMediaProperties.cs_ file to false.

![Resized image with permanent URL](https://docs.kentico.com/docsassets/k81/urls-of-resized-images-in-media-libraries/resized_image_permanent_url.png "Resized image with permanent URL")

> **Info:** The system also creates a new file every time you display this image as a thumbnail (e.g., in the **Tiles** or **Thumbnails** display tab of the Media library properties window).\
> Resizing to a **larger size** is not done internally (the system does not create any files), such feature could be exploited to bring the server down, e.g., resizing the image to 1000000 height and 1000000 width could consume the server resources.