Change canvas size of approx 125 images

Very simple project. I have a folder with 252 images. Half the images are thumbnails, the other half are larger images of size 1030x840. I need the size of the canvas of the images changed to 1200x1200 but I don't need the actually images to be resized to be larger or stretched. This needs to be done for all approx 126 images. I'm pretty sure there's a simple script that can do it in a few minutes, so I don't expect this job to be difficult or cost much. I need it done quickly so please keep this in mind. ## Deliverables 1) All deliverables will be considered "work made for hire" under U.S. Copyright law. Employer will receive exclusive and complete copyrights to all work purchased. (No 3rd party components unless all copyright ramifications are explained AND AGREED TO by the employer on the site per the worker's Worker Legal Agreement). ## Platform All files are jpgs.