1. WordPress Thumbnail Slider
This is beautiful thumbnail image slider plugin for WordPress.Add any number of images from admin panel.
2. FPW Post Thumbnails
There are many nice themes not providing any support for post thumbnails ( now called featured images ). Some themes provide such support but do not display them. Then we have three choices. First is to find another theme supporting and displaying thumbnails, second – forget about thumbnails, and the third is to get our hands dirty. The last one requires modifications to the current theme’s files ( not very elegant and practical as the next theme’s upgrade will wipe out those modifications ) or at least creating a child theme. FPW Post Thumbnails plugin makes these choices obsolete. It will add support for thumnails, display them, and give you more control over their appearance. And what’s most important it will not modify the current theme in any way.
3. WP-Thumbnail
WP-Thumbnail is a simple and neat WordPress Plugin that not only allows you to use a short-code to generate dynamic screenshot of webpages in your posts but also takes a realtime snapshot of the served webpage and saves a link to it on the page itself that too without burdening the servers. This helps in optimizing search results on Google by adding a thumbnail to the left of the search result snippet and makes shared posts more attractive, with a relevant thumbnails, on Social Sites like Facebook.
4. Easy Facebook Share Thumbnail
Easy Facebook Share Thumbnail makes it easy and almost instant! Using the post’s featured image, Easy Facebook Share Thumbnail is an easy no hassle way of instantly enabling wordpress websites to use post-specific thumbnails when used by the Facebook URL Sharing and Posting system. A default image can also be specified for the whole site.
5. bbPress Topic Thumbnails
This plugin adds support for Topic Thumbnails with bbPress. It works by retrieving the first image from each topic and displaying it alongside the topic title on the index page. Thumbnails are sized according to the default ‘thumbnail’ size in your WordPress media settings. The images will also resize appropriately if you’re using a responsive WordPress theme.
6. Video Thumbnails
Video Thumbnails simplifies the process of automatically displaying video thumbnails in your WordPress template.
7. Video Embed & Thumbnail Generator
Generates thumbnails, HTML5-compliant videos, and embed codes for locally hosted videos. Requires FFMPEG or LIBAV for thumbnails and encodes.
Premium Plugins
8. Thumbnail Gallery (WordPress Plugin)
This Plugin will help you to easily add a thumbnail gallery to your WordPress website or blog. The gallery is completely customizable, resizable and is compatible with all browsers and devices (iPhone, iPad and Android smartphones). You will be able to insert it in any page or post you want with inbuilt short code generator.
9. Thumbnail Scroller (WordPress Plugin)
This Plugin will help you to easily add a thumbnail scroller to your WordPress website or blog. The scroller is completely customizable, resizable and is compatible with all browsers and devices (iPhone, iPad and Android smartphones). You will be able to insert it in any page or post you want with an inbuilt short code generator.
10. Theia Smart Thumbnails
Theia Smart Thumbnails for WordPress lets you customize the thumbnails for each of your images. Gone are the days when you had to manually crop or upload separate versions of your thumbnails. Now you can simply choose a point of interest for your image – e.g. a person’s face, an object, etc. – and all the thumbnails will be automatically updated to include them. Your pages will be much more aesthetically pleasing and your visitors will thank you for it.
11. Slider PRO – WordPress Premium Slider Plugin
The slider is fully responsive and mobile-ready. It provides 150+ options, 100+ possible transition effects, from simple ‘fade’, ‘slide’ or ‘swipe’ effects to more complex ‘slice’ effects, 15+ skins and much more. Also, the slider’s administration area is very powerful and uses the default WordPress design, which WordPress users are already familiar with.
12. Thumbnail Gallery (WP NextGEN Gallery Template)
This NextGEN Template will help you to easily add a thumbnail gallery to your WordPress website or blog. The gallery is completely customizable, resizable and is compatible with all browsers and devices (iPhone, iPad and Android smartphones).
13. WP ThumbFx – Responsive jQuery Thumbnail Effects
Enrich your website experience with WPThumbFx, a WordPress jQuery animation plugin that brings your images and content in your articles to life. Create unique animated effects effortlessly without any knowledge of jQuery. All effects are responsive and adapt perfectly for all device resolutions like mobiles, tablets and desktops.