Thunder is the sound caused by lightning. Depending on the distance from and nature of the lightning, it can range from a sharp, loud crack to a long, low rumble (brontide). The sudden increase in pressure and temperature from lightning produces rapid expansion of the air within and surrounding the path of a lightning strike. In turn, this expansion of air creates a sonic shock wave, often referred to as a "thunderclap" or "peal of thunder".
Loading.io's icon library provides thousands of icons that are all customizable and animatable. You can choose up to 100+ animations and apply to any icons you picked to generate customized images with various formats including GIF, SVG, APNG or PNG sequence.
CC-BY Free Icons
When using in static form, most icons in Loading.io's icon library are released under CC-BY License, which can be used freely with attribution.
Loading icons are designed to be animated. We provide a handy collection of animation presets for you to apply on the icons you need, and generate the animation in desired format.
Animations can be customized and applied to single element of icons, making your design subtle and unique comparing to others.
All icons we provided are customizable by colors, size as to animation types and speed. With our online icon editor you can make icons with transparent background or convert them into black and white easily.
You can also keep your customization in loading.io for future use, or share directly with others.
Vector format Image
All icons are designed with the loseless vector format SVG to optimize the image quality and file size.
In addition to SVG format, we also provide GIF / APNG / PNG Sequence format download for generating images in static form.
While not explicitly shown, all icons are designed with specific theme and topic. you can find some of them in the icon set page. Following are some sample categories available in loading.io:
All icons in their static form are released under Loading.io BY License ( simliar to CC-BY ), so you can download these free icons and use their static form in your projects with proper attribution; additionally, we also provide pro features for building animated images. You can subscribe and upgrade to pro account to unlock the animation features, or purchase per item to unlock the features only for the icon you need.
If you don't want to attribute, we also provide options for you to pay to remove attribution. To learn more about loading.io license, please check our license document.
By its design, GIF is quite limited in quality especially with transparency on. If you got GIF with colored border around edges of generated image, you can turning off Edge Smoothing option and try again.
This option will give crispy edges around generated image, but might lead to pixelated result, so please use it at your discretion. For more information, check our guide about improving GIF image quality.
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