Typically, compressing a PDF file can be useful when the file is too large to be easily shared via email or uploaded to a website. Compressed files take up less storage space and can be transferred more quickly.
Compress PDF tools are often available as standalone applications, web-based tools, or plugins for popular PDF editing software. They may offer a range of compression options, including different levels of compression quality and the ability to specify which elements of the document should be compressed or removed.
While compressing a PDF file can reduce its file size, it may also result in a loss of image or text quality. Therefore, it's important to choose a compression method that strikes a balance between file size reduction and maintaining the document's readability and overall quality.