File uploads in a React app: What to use and pricing breakdown (2026)

React file uploads are generally more reliable and cost-effective when browsers send files directly to object storage using short-lived, server-authorized upload permissions, rather than routing file bytes through serverless API endpoints that impose small request-size limits and add processing costs. In an Upstash Blob example, a server handler defines file size, type, authorization, storage path, and completion behavior, while a typed React hook provides file selection, progress, retrying, resumable multipart uploads for files over 16 MB, and support for objects up to 5 TB. Upload interfaces also require drag-and-drop handling, client and server validation, progress reporting, and recovery from failed large uploads, although file-type checks do not replace malware scanning or make uploaded content trustworthy. Managed services such as Upstash Blob, UploadThing, and Vercel Blob provide upload tooling and storage, while raw platforms such as Cloudflare R2 and AWS S3 require developers to implement more of the client upload flow; Cloudinary additionally offers media transformations. Costs vary substantially by storage and download traffic, with Cloudflare R2 offering low storage pricing and free egress but requiring more engineering work, while Upstash Blob combines managed upload features with $0.02 per GB for storage and egress, compared with higher egress pricing for Vercel Blob and AWS S3 paired with CloudFront.

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