*Using Windows 7 & Photoshop CC 2017*
Thanks very much!
Photoshop ships with a batching script. Photoshop menu File>Scripts>Image Processor... . The is a better Plug-in Script you can download and install from the web names Image Processor Pro. Once installed you access in via Photoshop menu File>Automate>Image Processor Pro. Both scripts are also supported in the bridge. Bridge menu Tools>Photoshop>script name