is there any inbuilt service in WM 9.5 for compression of files or zipping files ?
any idea ,please suggest .

I am not aware of any inbuilt service that do that. but you can create your java service if you need to. there are several example online

check in wM public replicator package, to use inbuit service or you can creare the java service as well, which ever u need. !!!

You can find a sevice zip files in PSutilities package

There's no inbuilt service but in Java time can do it very easily...

Such operations are best performed at the OS level , since you need not to consume/utilize the IS memory for this task . If your files are large , then it can be very costly if you use IS memory . I suggest you to use the service "pub.utils:executeOSCommand" and perform zip , gzip , tar whatever you want at the OS level itself. Assuming your OS is unix , please refer MAN pages for these commands.