Filestack

Filestack takes care of file handling inside web and mobile applications, so developers do not have to build it themselves. Its file picker lets end users upload from their device or from sources such as Dropbox, Google Drive and Instagram, with resumable uploads for large files. Transformations resize, crop, convert or compress images, documents, audio and video through URL parameters, and Workflows chain several operations into one automated process. Files are then served through a CDN with signed URLs and access policies. Content intelligence features cover virus detection, object detection and sentiment analysis. It is used by developers and product teams whose applications accept user-generated files.