Displays the file upload progress bar and also the flexible UI file list.
Multiple-file upload with form support, drag and drop, progress bar, folder upload, and more.
Large file upload with pause, resume, retry, and cancel options using chunking.

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Blazor Components blazor file upload

Overview

The Blazor File Upload is a component for uploading files, images, documents, and audio and video files to a server. The File Upload works in both WebAssembly and Server-side Blazor apps, and also supports a rich set of features that include multiple file selection, progress bars, auto-uploading, drag and drop, folder (directory) uploading, file validation, and more.

Why choose Syncfusion Essential Studio^® Blazor File Upload?

Multiple-file upload

Select multiple files and upload them to a server at the same time. This is useful for uploading images to a gallery and for file-sharing applications. 

Drag and drop

Upload multiple files by simply dragging them from the file explorer to the drop area (drop zone), which is a more user-friendly way to select and upload multiple files. 

Folder upload

Accepts a folder (directory) as a file source for uploading all the files (including subfolders) of the selected folder.

AJAX file uploader

Using the AJAX library, the Blazor File Upload component easily uploads files in asynchronous mode.

Utilize chunk upload for large files

Manage upload of large file uploads efficiently using chunk upload that slices a large file into smaller chunks and uploads to the server in a sequential order asynchronously.

Create your own template designs

Allows users to create a custom UI in the Blazor File Upload based on their application need using a wide range of template options.

Attractive customizable themes

Cutting edge design with 5+ built-in themes such as Fluent, Tailwind CSS, Bootstrap, Material, Fabric, and more. Utilize the online Theme Studio tool to customize themes of File Upload easily.

Globalization and localization

Enables users from different locales to use the File Upload by formatting dates, currency, and numbering to suit their preferences.

Blazor File Upload Code Example

Easily get started with Blazor File Upload using a few simple lines of C# code, as demonstrated below. Also explore our Blazor File Upload Example that shows you how to render the uploader component.

Edit in Blazor Playground

razor

<SfUploader AutoUpload="false">
<UploaderEvents ValueChange="OnChange"></UploaderEvents>
</SfUploader>

@code {

private void OnChange(UploadChangeEventArgs args)
{
    foreach (var file in args.Files)
    {
        var path = @"path" + file.FileInfo.Name;
        FileStream filestream = new FileStream(path, FileMode.Create, FileAccess.Write);
        file.Stream.WriteTo(filestream);
        filestream.Close();
        file.Stream.Close();
    }
}
}

Resumable upload

A built-in feature to pause, resume, retry, and cancel a file upload. This helps users upload high-resolution images, videos, and other large files safely. Additionally, it provides an option to pause and resume automatically based on server connection.

Resumable upload documentation

Blazor File Upload with pause, resume, retry, and cancel.

Blazor File Upload with customized buttons.

Custom file upload button

The action buttons of the Blazor File Upload component are completely customizable, including its file list, which allows users create their own design for the Blazor File Upload UI.

Custom File Upload button documentation

File types (file extensions)

Upload various file types and impose restrictions to allow only valid types of files from the client-side, which is mandatory before uploading a file in the web application.

File types documentation

Blazor File Upload validates file type.

Blazor File Upload control restricts file size.

File validation (filter)

Users can add validation to check file size limits with minimum and maximum ranges, number of files required, total size, and MIME type before uploading a file to a server.

File validation documentation

File validation example.

Paste image to upload

The Blazor File Upload component processes images from the clipboard, also. Simply copy and paste the images to be uploaded to a server.

Delete uploaded files

Blazor File Upload provides a simple interface to delete wrongly uploaded files from a server.

Preload uploaded files

Users can configure previously uploaded files from the server with a success state, which is useful for viewing, removing, and manipulating them.

Blazor File Upload preload uploaded files.

Auto-upload

Users can initiate an automatic upload to upload files immediately upon adding them to the upload queue.

Auto-upload documentation

Right-to-left (RTL)

The Blazor File Upload component supports right-to-left rendering, which improves the user experience and accessibility for those who work with languages like Hebrew, Arabic, or Persian.

Blazor input File Upload with right-to-left mode.

Blazor input File Upload covers web accessibility.

Web accessibility

Fully supports WAI-ARIA accessibility, which allows the Blazor File Upload component to be accessed by on-screen readers and assistive devices.
Follows the WAI-ARIA Best Practices for implementing keyboard interaction.
The UI element visuals, such as foreground color, background color, line spacing, text, and images, were designed based on the WCAG 2.0 standard.

Blazor input File Upload works well in touch devices.

Touch support

The Blazor File Upload component provides the best user experience across phone, tablet, and desktop form factors.

Standard HTML forms

The Blazor File Upload component has form support (synchronous mode) to work with native HTML forms.

Form validation

Developer-friendly APIs

Developers can control the appearance and behaviors of the Blazor File Upload, including its file list, using a rich set of APIs.

API documentation

Our comprehensive competitor comparison of Blazor components will guide you to the perfect choice.

Multiple File Upload

Asynchronous upload

Chunked upload support

Explore Complete Blazor Comparison

Other supported frameworks

The File Upload is available for the React, Angular, JavaScript, and Vue frameworks. Explore its platform-specific options through the following links:

Supported browsers

The Blazor File Upload works well with all modern web browsers, including Chrome, Firefox, Edge, Safari, and Opera.

Supported browsers of Blazor File Upload.

Not sure how to create your first Blazor File Upload? Our documentation can help.

Start with Blazor Server-side File Upload Start with Blazor WebAssembly File Upload

ALL COMPONENTS

SMART COMPONENTS

GRIDS

DATA VISUALIZATION

CALENDARS

FILE VIEWERS & EDITORS

DROPDOWNS

NAVIGATION

INPUTS

LAYOUT

BUTTONS

INTERACTIVE CHAT

FORMS

NOTIFICATION

Frequently Asked Questions

✅ Why should you choose Syncfusion Essential Studio^® Blazor File Upload?

Extended version of the HTML5 file upload with a progress bar and flexible UI file list.
Blazor multiple-file upload with form support, drag and drop, progress bar, folder upload, and more.
Large file upload with pause, resume, retry, and cancel options using chunking.
File save and remove actions can be handled with and without server-side API endpoint (Services).
One of the best Blazor File Upload in the market that offers feature-rich UI to interact with the software.
Completely customizable using templates.
Simple configuration and API.
Supports all modern browsers.
Mobile-touch friendly and responsive.
Extensive demos and documentation to learn quickly and get started with Blazor File Upload.

✅ Where can I find the Syncfusion Blazor File Upload demo?

You can find our Blazor File Upload demo, which demonstrates how to render and configure the File Upload.

✅ Can I download and utilize the Syncfusion Blazor File Upload for free?

No, this is a commercial product and requires a paid license. However, a free community license is also available for companies and individuals whose organizations have less than $1 million USD in annual gross revenue, 5 or fewer developers, and 10 or fewer total employees.

✅ How do I get started with Syncfusion Blazor File Upload?

A good place to start would be our comprehensive getting started documentation.

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