How to check if my Eclipse is 32bit or 64bit [x86/x64]?

If you have the original .zip Eclipse package , look at its file name.

·         If the .zip has "x86_64" , then your Eclipse is x64 / 64-bit version

·         If the .zip doesn’t have  "x86_64" , then your Eclipse is x86 / 32-bit version

For instance

·         eclipse-java-2019-03-R-win32-x86_64.zip

This is x64 eclipse for Windows OS

·         eclipse-SDK-4.9-win32.zip

This is x86 eclipse for Windows OS

·         eclipse-SDK-4.9-linux-gtk-x86_64.tar.gz

This is x64 eclipse for Linux

·         eclipse-SDK-4.9-linux-gtk.tar.gz

This is x86 eclipse for Linux