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See Filestack.

Filepicker.io (now Filestack) 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.

Filepicker.io offers a file browsing UI tool, which is a file uploader UI that can connect a developer's app to more than 20 different cloud storage sources where files are stored.

Key features of Filepicker 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 Filepicker.