Uppy

Uppy is a modular JavaScript file uploader built around a plugin architecture: a small core handles state and uploads, and plugins add sources (local disk, webcam, Google Drive, Dropbox, Box, or remote URLs via the optional Companion server), UI (a pre-built Dashboard, or headless components/hooks for a custom interface), editing (like an image editor), and upload transports - including resumable uploads over the open tus protocol, so large uploads can survive network interruptions.

It has first-class integrations for plain JS/HTML, React, Svelte, and Vue (with more limited Angular support), and gives three ways to build the UI depending on how much control you need: a plug-and-play Dashboard component, smaller headless components, or hooks to build a fully custom interface. Uppy works standalone or paired with Transloadit (made by the same team) for file encoding, conversion, and delivery, but doesn't require it.

Uppy is a fit for teams that need a flexible, customizable file-upload widget rather than a basic native `<input type="file">`, especially when resumable uploads or multiple file sources are needed.