The best alternatives to Filestack are Uppy, Uploader Window, and Shubox. If these 3 options don't work for you, we've listed a few more alternatives below.
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Uppy is a sleek, modular JavaScript file uploader that integrates seamlessly with any application. It’s fast, easy to use and lets you worry about more important problems than building a file uploader. - Fetch ...
Add file upload capabilities to your website or projects in just 1 line of JS code! Supports direct uploading from Facebook, Dropbox, GDrive, via Link, via Image Search, Mic, Camera, Youtube, etc. You can save ...