Python FastAPI Tutorial (Part 12): File Uploads - Image Processing, Validation, and Storage

Published: 27 February 2026
on channel: Corey Schafer
6,525
250

In this video, we'll be learning how to handle file uploads in FastAPI using UploadFile. We'll allow users to upload profile pictures by building an image processing utility with Pillow, adding proper validation for file type and size, and saving processed images to disk. We'll also cover important concepts like using run_in_threadpool to handle CPU-bound work in async endpoints, generating secure filenames with UUID, and sending files from the frontend using FormData. By the end of this tutorial, users will be able to upload, preview, and display profile pictures across the application. Let's get started...

The code from this video can be found here:
https://github.com/CoreyMSchafer/Fast...

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