Note: This PDF compression tool is not deployed yet as I am using serverless deployment, and it requires some command scripts to run. Currently, it only works in local storage (Do Have Ghostscript Installed in Your System), but soon it will be deployed as I am planning to deploy those scripts to AWS EC2 Virtual Servers.
I have tested PDF compression with a 100MB PDF file. In low compression, it compressed the file to 65MB, in normal compression to 53MB, in high compression to 6MB, and in extreme compression to 1.8MB.