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Filestack

Definition:

Filestack (formerly filepicker.io) is a developer service for file upload, transform, convert, and delivery. They allow software developers to integrate more than 25 cloud storage services with just a few lines of code. End users can upload content from websites and mobile apps like Facebook, Instagram, and Dropbox or wherever that content is stored.

Filestack's products include a file browsing UI tool called Filestack Upload. The customizable file uploader UI can connect a developer's app to more than 20 different cloud storage sources where files are stored.

Key features of Filestack Upload include previewing uploaded files directly inside the File picker, progress bars, multi-file uploads, custom CSS, client-side cropping, and unlimited uploads.

The Kloudless File Picker is an alternative and competitor to Filestack.