Muneeb Ur Rehman

Frontend File Uploader allows admins to add a simple form on frontend of WordPress website to enable their users to upload files directly in WordPress database.
Using this Shortcode: [ffu-shortcode]
Below are some salient features:
<h3>Frontend File Uploader Features</h3>
<ul>
<li>Simple to use</li>
<li>100% responsive</li>
<li>No limitation on the number of files</li>
<li>Easy to add anywhere using a shortcode. </li>
<li>You can manage the uploaded files in WordPress admin panel.</li>
</ul>
<h4>Do you want to contribute?</h4>
If you have ideas that can help us improve our plugin and user experience, please contact us at rmkhan1996@hotmail.com 
A few notes about the sections above:

Frontend File Upload

Allows users to upload files directly in WordPress Database from frontend.

Samuel Wood (Otto)

Normally when you upload an image to a WordPress site, it creates several differently sized versions of the image automatically. Themes can define custom image sizes as well, increasing the amount of images generated on your server.
This plugin changes the way WordPress creates images to make it generate the images only when they are actually used somewhere, on the fly. Images created thusly will be saved in the normal upload directories, for later fast sending by the webserver. The result is that space is saved (since images are only created when needed), and uploading images is much faster (since it’s not generating the images on upload anymore).
“Pretty” permalinks must be enabled for this plugin to function.
Note: This plugin does not work on multisite setups, due to the way WordPress handles file serving in such situations (with ms-files.php).
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Dynamic Image Resizer

Make your images change sizes dynamically.

Frontend File Upload vs Dynamic Image Resizer