PhotoBulk is a basic bulk image editor designed for macOS. It allows its users to place different kinds of watermarks onto the images, resize and optimize them in batch. This tool will also be handy for those who look for a convenient way to rename or convert images in large quantities at once. 

Supported formats

PhotoBulk for macOS supports the following formats: JPEG, PNG, GIF, BMP, TIFF.

Note: HEIC  format is supported starting from macOS 10.13.