Changing image size is a common requirement for various purposes. It can be essential for web or mobile apps, social media sharing, and official documents. Here, we will discuss the importance of changing image size. Firstly, changing image size for web or mobile apps is crucial for optimizing website or app performance. Large images can slow down the loading speed of a website or app, which can result in a negative user experience. Therefore, it's necessary to resize images to fit the required dimensions while keeping the file size as small as possible without sacrificing quality. Secondly, changing image size for social media sharing is essential to ensure that your images look great and are easily shareable on various social media platforms. Different platforms have different image size settings, so it's necessary to resize your images accordingly to make sure they look their best. Lastly, changing image size for official documents is necessary for legal or professional purposes. For instance, when submitting a job application or a visa application, you may need to provide specific image size and quality. In this case, resizing images can be important to ensure that they meet the specific settings. In conclusion, changing image size is crucial for various purposes, including web or mobile apps, social media sharing, and official documents. It's essential to resize images while maintaining their quality and optimizing file size to ensure that they look great and load quickly. Using online tools or image editing software can help you resize images quickly and easily.