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Overview

The ASP.NET Core file upload control is helpful for uploading one or multiple files, images, documents, audio, video, and other files to a server in an ASP.NET Core framework. The control is an extended version of the HTML5 upload control (<input type="file">) with multiple-file selection, progress bars, auto-uploading, drag-and-drop, pre-loading of files (initial files), folder uploading (directory),paste to upload, file validation, and more.


ASP.NET Core file upload built using AJAX

AJAX file uploader

The ASP.NET Core file upload control 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

ASP.NET Core file upload process large files using chunk upload


ASP.NET Core 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.

ASP.NET Core file upload handles multiple files


ASP.NET Core file upload with drag and drop files

Drag and drop

The file upload control 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.


Upload images with previews

The ASP.NET Core file upload control allows you to upload images and perform manipulation easily before uploading them. You can resize images, show an image preview or thumbnail, etc.

ASP.NET Core image upload with its preview thumbnails


ASP.NET Core file upload with customized buttons

Custom file upload button

The action buttons of the ASP.NET Core file upload control are completely customizable, including its file list, which helps you create your own design for the 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.

ASP.NET Core file upload validates file type


ASP.NET Core 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 control accepts a folder (directory) as a file source for uploading. It uploads all the files (includes subfolders) of the selected folder.

ASP.NET Core file upload process complete directory


ASP.NET Core file upload process images from clipboard on paste

Paste image to upload

The file upload control processes images from the clipboard, also. Simply copy and paste the images to be uploaded to a server.


Delete uploaded files

The ASP.NET Core file upload control provides a simple interface to delete files from a server after uploading them, which helps you delete wrongly uploaded files.

ASP.NET Core 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.


Auto-upload

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


ASP.NET Core file upload with progress bar

Progress bar

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


Localization

Users can set corresponding translation texts to the static strings used in the ASP.NET Core file upload control through the localization library.

ASP.NET Core file upload displays localized static texts


ASP.NET Core file upload with right-to-left mode

Right-to-left (RTL)

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


Additional parameters

The file upload control allows you to pass additional parameters along with an upload request as an HTTP header or custom parameters.

Standard HTML forms

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


ASP.NET Core file upload covers web accessibility

Web accessibility

  • Fully supports WAI-ARIA accessibility, which allows the file upload control 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.

ASP.NET Core file upload works well in touch devices

Touch support

The ASP.NET Core file upload control provides the best user experience across phone, tablet, and desktop form factors.


Themes

The file uploader control 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 file upload, including its file list, using a rich set of APIs.


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