What is the best way to reduce the size of images for uploading to a website

Our website, developed in .NET with a SQL Server database, functions as a marketplace where users can upload images and product descriptions. However, some customers encounter issues when trying to upload images, particularly when uploading multiple photos. If we could reduce the file size before sending it to the server, it would likely resolve this problem. I am interested in finding a solution that allows us to keep the image quality high but efficiently shrink the file size for transmission. Any guidance on how to achieve this would be greatly appreciated.

javascriptasp.net

Answer №1

There are multiple methods to achieve your desired outcome using JavaScript

  • The user can crop the image in the user interface (using a specific plugin)
  • You can adjust the size of the chosen file with JavaScript to a set dimension by drawing the image on a canvas (refer to this article for detailed information)
  • Modify the image in a canvas and then reduce the quality of the image (check out the second parameter of the toDataURL method of the canvas, find more information about toDataURL here)

Ensure that all three previous options involve manipulating images in base64 format. To save them on your server, initiate a post submit within a form with a field containing the base64 string, and then process it on your server.

Answer №2

To optimize file uploads, consider restricting the accepted file types to highly compressed formats such as jpeg for smaller file sizes.

While it may not be possible to compress raw images using JavaScript on the client-side before transferring, one workaround is to utilize <canvas> for drag and drop functionality. This allows you to scale and save the image as a jpeg prior to sending it to the server.

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