Gramblr is a straightforward application designed for Mac users who want to upload images to their Instagram accounts directly from their computers. This free tool simplifies the process by allowing users to log in with their Instagram credentials and select images for upload. It requires images to be square with a minimum resolution of 640x640 pixels, adhering to Instagram's standards. The application also provides a link to a website that can assist with cropping images, although any photo editing software can achieve this as well.

Once the image is prepared in JPEG format, users can easily upload it by clicking the Upload button. Additionally, users can add a short description to accompany the image and share it on Facebook and Twitter, mirroring the functionality available in the mobile app. However, Gramblr does not support any editing effects or filters, ensuring a straightforward upload experience without enhancements.