A HTML attribute for responsive images to optimize page load speed.


SRCSET is an HTML attribute that allows developers to specify a set of images for the browser to choose from, based on the screen resolution. It is an essential aspect of responsive web design that works hand in hand with the sizes attribute. The SRCSET attribute tells the browser all the available image sources and their respective sizes, thus enabling the browser to select the most suitable image source according to the user's device, viewport size, screen resolution, and other factors.

Did you know?
Linkactions automatically generated 1,392 internal links for this website
It found them in just a few minutes and required less than 30 minutes to review.
Linkactions saved us days of hard work!

Usage and Context

In the context of responsive web design, SRCSET is used within the img tag of an HTML document. The attribute is followed by a list of image source URLs, each accompanied by a descriptor indicating the image's width (w) or pixel density (x). The browser uses this information, along with the sizes attribute if present, to select the most appropriate image from the list. This means that a user on a small mobile device won't needlessly download a large, high-resolution image intended for desktop users, which saves bandwidth and speeds up page load times.


  1. What is SRCSET in HTML?

    • SRCSET is an HTML attribute used in responsive web design. It allows developers to provide a list of image sources and their sizes, so the browser can choose the most appropriate one for the user's device and screen resolution.
  2. How do you use SRCSET?

    • SRCSET is used within the img tag of an HTML document. The SRCSET attribute is followed by a list of image URLs, each with a width or pixel density descriptor. The browser uses this information to select the most suitable image based on the user's device and screen resolution.
  3. Why is SRCSET important for SEO?

    • SRCSET is important for SEO because it improves page load speed by ensuring users only download the most appropriate image for their device. Faster load times can result in higher rankings on search engine results pages (SERPs).
  4. Can I use SRCSET for all images on my site?

    • Yes, SRCSET can be used for all images on a site. However, it is most beneficial for images that significantly impact page load times, such as large, high-resolution images.
  5. What is the difference between SRCSET and sizes in HTML?

    • SRCSET provides a list of image sources and their sizes, while the sizes attribute tells the browser how each image will be displayed on different screen sizes. Both attributes work together to help the browser choose the best image to load.


  1. Improved Page Load Speed: By allowing the browser to choose the best image for the user's device, SRCSET can significantly reduce page load times.
  2. Enhanced User Experience: Faster page load times lead to a smoother, more enjoyable user experience, which can increase engagement and reduce bounce rates.
  3. Reduced Bandwidth Usage: By ensuring users only download the most appropriate image, SRCSET can reduce bandwidth usage, which can be particularly beneficial for users on limited data plans.
  4. Potential SEO Boost: Faster page load times can lead to higher rankings on SERPs, potentially increasing visibility and traffic to your site.
  5. Future-Proof Design: By accommodating a range of device sizes and resolutions, using SRCSET helps ensure your site will continue to perform well as new devices come onto the market.

Tips and Recommendations

  1. Use With Sizes Attribute: For the best results, use SRCSET in conjunction with the sizes attribute. This gives the browser more information about how the image will be displayed, helping it make the best choice.
  2. Include a Fallback Image: Always include a fallback image using the src attribute for browsers that don't support SRCSET.
  3. Test on Various Devices: Test your implementation of SRCSET on a variety of devices and screen resolutions to ensure it's working as expected.
  4. Optimize Your Images: Even with SRCSET, it's still important to optimize your images for web use by reducing file size without compromising quality.
  5. Stay Up-to-Date: Web standards and best practices evolve, so keep up-to-date with the latest recommendations for using SRCSET and other HTML attributes.


In conclusion, SRCSET is an integral part of responsive web design and has significant implications for SEO. By allowing browsers to select the most suitable image for a user's device and screen resolution, it can speed up page load times, enhance user experience, and potentially boost a site's SERP ranking. It's important to use SRCSET correctly, along with the sizes attribute, and to keep up-to-date with best practices as web standards evolve.