Enhance User Experience With Pre Upload Video Playback In Blazor File Upload

Updated on Oct 16, 2025

Enhancing user experience in file uploads is essential for modern web applications, and the Syncfusion Blazor File Upload component makes it easy to implement advanced features like client-side video previews. This guide demonstrates how to add video preview functionality to the Syncfusion Blazor File Upload control, allowing users to visually verify their selected video files before initiating the upload.

Use Cases

Media Management Systems: Allow users to confirm video content quality and relevance before committing to an upload
Social Media Platforms: Enable creators to preview short clips or stories before sharing
E-Learning Portals: Help instructors verify lecture videos or tutorials prior to submission
Customer Support Tools: Let users validate screen recordings or demo videos before attaching them to tickets

Prerequisites

Implementation Overview

The solution uses these key features:

Configure Blazor File Upload with AutoUpload="false" for manual upload control
Handle FileSelected event for file metadata extraction
Use JavaScript Interop to create temporary object URLs for video preview
Display video preview using HTML <video> tag within UploaderTemplates
Manage upload lifecycle with various event handlers

Features

Client-side video preview before upload
Restricted file type support (.mp4, .avi, .mov, etc.)
Real-time upload status updates
File metadata display
Remove/Delete functionality
Error handling and user feedback
Responsive design with flexbox layout

Getting Started

Clone this repository
Open the solution in Visual Studio
Restore NuGet packages
Run the application
Test the video preview functionality