How to Build a Complete File-Sharing Application Using Filestack

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File sharing is a common requirement across many types of applications, from internal tools and client portals to full-featured SaaS products. While the concept is straightforward, implementing it well requires handling uploads, generating shareable links, delivering files globally, and optionally supporting real-time image transformations.

This guide walks through building a complete file-sharing application using Filestack for uploads, storage, CDN delivery, and image processing.

What We鈥檙e Building

A user visits your app, drops a file, and gets back a short link. Anyone with that link can preview, download, or view the file. If the file is an image, they can apply transformations like blur, crop, grayscale, and rounded corners, then copy the transformed URL, all without any server-side image processing code.

What you鈥檒l have at the end:

  • Drag-and-drop file upload with real-time progress
  • Unique shareable short link per file
  • Image previews with on-the-fly transformations

Stack

Next.js (App Router)

File upload &...

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