Leo Baiano

This plugin includes a button that appears when the user scrolls the scroll bar when you click the button the user is taken to the top of the site.
Visit the <a href="https://wordpress.org/plugins/lb-back-to-top/screenshots/" rel="ugc">Screenshots</a> tab to see an example of the plugin running.
<h4>Credits</h4>
<ul>
<li>JS Script <a href="http://www.developerdrive.com/" rel="nofollow ugc">Jonathan Schnittger</a></li>
</ul>

LB Back To Top

Including button that takes the user to the top of the page.

Space X-Chimp

An easy to use, with intuitive interface, WordPress plugin that gives you the ability to easily and safely add a “Scroll to Top” button to your WordPress website.
The “Scroll to Top” button appears at the bottom-right of the website once the visitors scrolls down a page on your website. It appears only when visitors scroll down the webpage. As a result, your website visitors can easily scroll smoothly back to the very top of a page with one click of the button. This can be particularly handy for pages with a lot of text/content, or in cases wherever a browser’s scrollbar is just not good enough (or not present at all, like on tablets) to enable one-click, one-screen scrolling. This gives your website better navigation and also adds a more professional look to your website.
This plugin give you finer control over “Scroll to Top” button, it can be configured on the plugin settings page. You can select where the button will be showed, such as home page or all pages. You can customize the button style using and combining 10 symbols and 4 backgrounds from FontAwesome library, in result you have 40 variations of buttons. You can change the size of button, color (unlimited) of background, color (unlimited) of symbol and etc. If you want more options, then let us know and we will be happy to add them.
Its purpose is to provide a familiar experience to WordPress users. You don’t need to edit any file of your theme, this plugin will do everything for you. It’s just plug and play, no tedious configurations or hacks, just install, enable and start enjoying your fancy “Scroll to Top” button. It’s that simple! In addition, your “Scroll to Top” button will be compatible with all major browsers and work with any theme.
Features
<ul>
<li>Lightweight and fast</li>
<li>Secure code with using clear coding standards</li>
<li>Intuitive interface with many settings</li>
<li>Cross browser compatible (work smooth in any modern browser)</li>
<li>Compatible with all WordPress themes</li>
<li>RTL compatible (right to left)</li>
<li>Translation ready</li>
</ul>
Key features include
<ul>
<li>Retina display support</li>
<li>FontAwesome integrated (available 40 combinations of icons)</li>
<li>Background color changer (Unlimited colors)</li>
<li>Symbol color changer (Unlimited colors)</li>
<li>Changeable button background and symbol</li>
<li>Changeable size of button</li>
<li>Changeable scroll duration</li>
<li>Option to enable/disable button</li>
<li>Option to display button in full website or in Home page only</li>
<li>Auto hide button on top of webpage</li>
<li>Live preview</li>
<li>And much, much more!</li>
</ul>
Translation
This plugin is ready for translation and has already been translated into several languages. But If your language is not available then you can make one. It is also possible that not all existing translations are up-to-date or correct, so you are welcome to make corrections. Many of plugin users would be delighted if you share your translation with the community. Thanks for your contribution!
<ul>
<li>English (default)</li>
<li>Russian (translation by <a href="https://www.instagram.com/milava_kiseleva/" rel="nofollow ugc">Milena Kiseleva</a>)</li>
<li>German (translation by Michael)</li>
<li>Spanish (translation by Ramiro Garcés and Patricio Toledo)</li>
<li>Dutch (translation by Peter Leenders)</li>
<li>French (translation by Jean-Michel, Theophil Bethel and Hervé Bouzin)</li>
</ul>
If you want to help translate this plugin, please visit the <a href="https://translate.wordpress.org/projects/wp-plugins/simple-scroll-to-top-button" rel="nofollow ugc">translation page</a>.
Minimum system requirements:
<ul>
<li><a href="https://wordpress.org">WordPress</a> version 4.9 or higher.</li>
<li><a href="https://secure.php.net" rel="nofollow ugc">PHP</a> version 5.6 or higher.</li>
<li><a href="https://www.mysql.com" rel="nofollow ugc">MySQL</a> version 5.0 or higher.</li>
</ul>
Recommended system requirements:
<ul>
<li><a href="https://wordpress.org">WordPress</a> version 5.0 or higher.</li>
<li><a href="https://secure.php.net" rel="nofollow ugc">PHP</a> version 7.0 or higher.</li>
<li><a href="https://www.mysql.com" rel="nofollow ugc">MySQL</a> version 5.6 or higher.</li>
</ul>
Contribution
Developing plugins is long and tedious work. If you benefit or enjoy this plugin please take the time to:
<ul>
<li><a href="https://www.spacexchimp.com/donate.html" rel="nofollow ugc">Donate</a> to support ongoing development. Your contribution would be greatly appreciated.</li>
<li><a href="https://wordpress.org/support/plugin/simple-scroll-to-top-button/reviews/#new-post">Rate and Review</a> this plugin.</li>
<li><a href="https://www.spacexchimp.com/contact.html" rel="nofollow ugc">Share with us</a> or view the <a href="https://github.com/ArthurGareginyan/simple-scroll-to-top-button" rel="nofollow ugc">GitHub Repo</a> if you have any ideas or suggestions to make this plugin better.</li>
</ul>
“Simple Scroll to Top Button” is one of the own software projects of <a href="https://www.spacexchimp.com" rel="nofollow ugc">Space X-Chimp</a>.
License
This plugin is licensed under the <a href="http://www.gnu.org/licenses/gpl-3.0.html" rel="nofollow ugc">GNU General Public License, version 3 (GPLv3)</a> and is distributed free of charge. 
Commercial licensing (e.g. for projects that can’t use an open-source license) is available upon request.
Credits
<ul>
<li>The icon of this plugin is a copyrighted image created by the <a href="https://www.spacexchimp.com" rel="nofollow ugc">Space X-Chimp</a> team. (C) All rights reserved.</li>
<li>The banner of this plugin is a copyrighted image created by the <a href="https://www.spacexchimp.com" rel="nofollow ugc">Space X-Chimp</a> team. (C) All rights reserved.</li>
<li>Unless otherwise stated, all images are created by the <a href="https://www.spacexchimp.com" rel="nofollow ugc">Space X-Chimp</a> team and are copyrighted. (C) All rights reserved.</li>
<li><a href="http://getbootstrap.com" rel="nofollow ugc">Bootstrap</a> by Twitter, Inc. released under the <a href="https://github.com/twbs/bootstrap/blob/master/LICENSE" rel="nofollow ugc">MIT license</a>.</li>
<li><a href="https://github.com/vsn4ik/bootstrap-checkbox" rel="nofollow ugc">Bootstrap-checkbox</a> is a project of <a href="https://github.com/vsn4ik" rel="nofollow ugc">Vasily A.</a>, shared under the <a href="https://github.com/vsn4ik/bootstrap-checkbox/blob/master/LICENSE" rel="nofollow ugc">MIT license</a>.</li>
<li><a href="https://fontawesome.com" rel="nofollow ugc">Font Awesome</a> is an open source-project created by Dave Gandy. Font released under the <a href="http://scripts.sil.org/OFL" rel="nofollow ugc">SIL OFL 1.1 license</a>. Code released under the <a href="http://opensource.org/licenses/mit-license.html" rel="nofollow ugc">MIT License</a>.</li>
</ul>
Links
<ul>
<li><a href="https://www.spacexchimp.com" rel="nofollow ugc">Developer website</a></li>
<li><a href="https://github.com/ArthurGareginyan/simple-scroll-to-top-button" rel="nofollow ugc">Dedicated plugin page on GitHub</a></li>
<li><a href="https://wordpress.org/plugins/simple-scroll-to-top-button/">Dedicated plugin page on WordPress.org</a></li>
</ul>

Simple Scroll to Top Button

Easily and safely add a "Scroll to Top" button to your WordPress website.

LB Back To Top vs Simple Scroll to Top Button