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The Blazor File Upload is a component for uploading one or multiple files, images, documents, audio, video, and other files to a server. It is an extended version of the HTML5 upload component (<input type="file">) with a rich set of features that includes multiple file selection, progress bars, auto-uploading, drag and drop, folder (directory) uploading, file validation, and more.

Blazor file upload built using AJAX

AJAX file uploader

The Blazor file upload component seamlessly works with asynchronous mode using the AJAX library.

Upload large files

Manage large file uploads efficiently using chunk upload. The large files are sliced into small chunks and upload to the server in sequential order for asynchronous mode

Blazor file upload process large files using chunk upload

Blazor file upload with pause, resume, retry, and cancel

Resumable upload

A built-in feature is available 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.

Multiple file upload

Users can select multiple files and upload them to a server at the same time, which is useful for uploading images to a gallery and file sharing applications.

Blazor file upload handles multiple files

Blazor file upload with drag and drop files

Drag and drop

The Blazor file upload component can 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.

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 helps you create your own design for the Blazor file upload UI.

File types (file extensions)

Users can 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.

Blazor file upload validates file type

Blazor file upload 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.

Upload folder (directory)

The component accepts a folder (directory) as a file source for uploading. It uploads all the files (includes subfolders) of the selected folder.

Blazor file upload process complete directory

Blazor file upload process images from clipboard on paste

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

The Blazor file upload component provides a simple interface to delete files from a server after uploading them, which helps you delete wrongly uploaded files.

Blazor file upload removes the uploaded files

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.


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

Blazor file upload with progress bar

Progress bar

The Blazor File Upload component displays a built-in progress bar (progress indicator) with the progress percentage during each file upload. It is completely customizable.


Users can set corresponding translation texts to the static strings used in the Blazor file upload component through the localization library.

Blazor file upload displays localized static texts

Blazor input file upload with right-to-left mode

Right-to-left (RTL)

The Blazor file upload component supports right-to-left rendering, which improves the user experience and accessibility for those who use RTL languages.

Standard HTML forms

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

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.


The Blazor file uploader component has several built-in themes such as material, bootstrap, fabric (Office 365), and high contrast. Users can customize any one of these built-in themes or create new themes to achieve their own desired look and feel either by simply overriding SASS variables or using our Theme Studio application.

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.

Other supported frameworks

Blazor File Upload is also available in JavaScript, Angular, React and Vue frameworks that are built from their own TypeScript libraries.

Blazor Components – 65+ UI and DataViz Components

Frequently Asked Questions

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