How to Upload a File on a Flask Server (2025)

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How to Upload a File on a Flask Server – Step-by-Step Guide Want to learn how to **upload files on a Flask server**? In this tutorial, we’ll walk you through the entire process of **handling file uploads in Flask**, one of the most popular Python web frameworks. Whether you’re building a simple web application or a full-fledged API, this guide will help you **set up file uploading functionality** quickly and efficiently. ### 🔹 **What You’ll Learn in This Video:** ✅ How to **set up a Flask server** for file uploads ✅ Understanding **HTML form** for uploading files ✅ Handling **multipart/form-data** requests in Flask ✅ Using **Flask’s request object** to retrieve uploaded files ✅ Saving uploaded files to a specific directory ✅ Setting up **file type restrictions** (e.g., only allowing images, PDFs, etc.) ✅ How to handle **multiple file uploads** in Flask ✅ Best practices for **file storage and security** ### 🔹 **Why Use Flask for File Uploads?** Flask is a lightweight and powerful **Python web framework** that makes it easy to build web applications and APIs. **Uploading files in Flask** is simple and efficient, making it ideal for: 🔹 **Handling user-generated content** (images, PDFs, documents) 🔹 **Processing CSV, Excel, or JSON files** for data analysis 🔹 **Uploading profile pictures, resumes, or reports** in web apps 🔹 **Building APIs** that allow file uploads ### 🔹 **Requirements for This Tutorial:** ✔ **Basic knowledge of Python and