Top 10 Lazy Loading JavaScript Libraries Of 2018

Page speed is one of the most important ranking factors in today’s search engine optimization. In this blog post, I’d like to introduce 10 best JavaScript libraries to lazy load large images (and other DOM elements) within the document that makes it possible to significantly increase page speed and enhance your page rankings. I hope you like it and help me spread the world.

Originally Published Nov 28 2017, updated Nov 29 2018

Top 10 Image Lazy Load JavaScript Libraries:

1. Lazy Load iFrame Embedded Content With JavaScript – lazyframe.js

lazyframe

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lazyframe.js is a native JavaScript library used to delay the loading of iframe content for Google Maps, Youtube/Vimeo/Vine videos and so on.


2. Tiny JavaScript Library For Progressive Image Lazy Loading – Progressively

progressively

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Just another fast, dependency-free JavaScript library used to lazy load images with a progressive blur loading effect as you seen on Medium or Instagram.


3. Pure JavaScript Library For Lazy Loading Images – lazyload.js

Pure JavaScript Library For Lazy Loading Images – lazyload.js

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lazyload.js is a stand-alone JavaScript library for lazy loading images without any dependencies. It supports the srcset attribute and with and takes best advantage from the progressive JPEG image format.


4. Responsive Image Lazy Load JS Library – lazysizes

Responsive Image Lazy Load JS Library - lazysizes

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lazysizes is an easy yet robust JS library used to delay the loading of images (iframes, scripts, etc) until they come into view, as well as loading the appropriate sources according to the breakpoints defined in the markup to fit any screen size. Designed for high performance websites to improve the page load time and to save the bandwidth.


5. Vanilla JavaScript Library For Image Lazy Load – vanillaLazyLoad

vanillaLazyLoad

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Yet another vanilla JavaScript library that helps delay the loading of images until they become visible in the viewport. Helpful to speed up page loading times and decrease traffic. Also supports background images.


6. Performant Element lazy Load Library – Lozad

Performant Element lazy Load Library Lozad

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Lozad is a small (569 bytes minified & gzipped), highly performant JavaScript library used to lazy load any html elements (e.g. images, videos, etc.) using Intersection Observer Web API.


7. Small Image Lazy Loader – yall.js

Small Image Lazy Loader yall.js

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yall.js is a really small JavaScript library to lazy load images as the users scroll through your content heavy webpage. Supports srcset attribute and picture element. Based on the Intersection Observer API.


8. Delay The Loading Of Images Until Needed – lazy-image

Delay The Loading Of Images Until Needed – lazy-image

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The lazy-image library allows to load image sources on-demand (e.g. click, in view, etc).


9. Intersection Observer Based Image Lazy Load Library – io-lazyload

Intersection Observer Based Image Lazy Load Library – io-lazyload

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io-lazyload is an extremely fast JavaScript library for lazy loading images that uses IntersectionObserver API to handle image position detection.


10. Lazy Load & Pre-cache Images To Improve Page Speed – Img2

Lazy Load & Pre-cache Images To Improve Page Speed – Img2

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Img2 is a web component that lazy-loads and pre-caches images to improve the page loading time.

Also comes with an image blur effect that allows the user to preview the image until the image is completely loaded.