Hi, my name is Matt and I would like to create a Mac application for you (22 years of IT development, webmastering and multimedia, graduated in digital image recognition).
This bid is for a node.js (Electron) application that will:
1. Allow selection of images or folder.
2. Offer selection to save in the same format or convert all selected images to JPEG, PNG, WebP, TIFF, DZI or VIPS V image format.
3. Offer output resizing dimensions for fixed pixels or percentage of the size (e.g. 200x200 or 75%).
So if there is no requirement for ObjectiveC or Swift application it can be built fast, with Mac package installer as well. Only the size of the final application is larger because Electron bundles Chrome engine (to be used for web browsing) so it's about 110-120 MB. That is not an issue if you are using this app internally (might be if you are selling it).
Looking forward to your reply,
Matt