From the vCenter Server HTML5 Web Client

1. Power off the VM.
2. Enable the Copy & Paste for the Windows/Linux virtual machine:
   1. Right-click the virtual machine and click Edit Settings.
   2. Click the VM Options tab, expand Advanced, and click Edit Configuration.
   3. Click on Add Configuration Params three times to give three rows 
   4. Fill in the Name and Value fields as mentioned below:

5. Click OK to save and exit out of the Configuration Parameters wizard. Note: These options override any settings made in the guest operating system’s VMware Tools control panel. 
6. Click OK to save and exit out of the Edit Settings wizard.

3. Power on the VM
4. Then use Copy/Paste directly on Windows/Linux/any other platform. 
5. For paste operation's target platform is Linux, Older X applications do not use a clipboard. Instead, they let you paste the currently selected text (called the "primary selection") without copying it to a clipboard. Pressing the middle mouse button is usually the way to paste the primary selection. For more information see Copying and pasting from a Windows guest to Linux host.