Image optimization for websites

Image optimization for websites is one of the key elements in web design. Image loading depends on the speed of loading the website, the number of visits, and user satisfaction, as well as the time that visitors will spend on the page. We can say that image optimization is one of the most important factors when it comes to SEO optimization, which in turn refers to improving the results that a website will have in Google search. In other words, the more SEO-optimized images you have on your website, the higher, better your site will rank in search results for certain keywords.

Image optimization – the most important details

Many superficial experts on the operation of the Google algorithm do not attach much importance to image optimization. Thus, they put images of a generic name (type 13file 392b …) on web pages, while descriptions and keywords related to the image remain blank. In this way, the Google search engine cannot conclude what kind of image it is, ie what it displays, so the SEO value of such an image is zero. Google evaluates images by checking the textual content associated with the image, including the image nameAlt text, and descriptionIf you want, you can also put a title to the picture frame itself. The image-related text should always optimize the image according to the keywords mentioned on the page or article to which the image refers.

For example, the image associated with this article has been properly optimized according to SEO guidelines, which you can see below.

Text and size – the “kings” of SEO image optimization

The saying that “an image is worth more than a thousand words” certainly cannot be applied to Google, which is essentially a mathematical algorithm and cannot evaluate the “beauty of an image”, but gives it meaning in accordance with what you wrote next to the image. Therefore, we can say that correctly written texts, descriptions, and keywords are the kings of every SEO optimization.

Of course, beautiful images on your website can impress visitors, but which visitors will get it at all (and how) if the page is not optimized properly? In addition to omitting SEO text related to images, one of the most common mistakes when posting images is that people often buy stock images from specialized services such as Fotolia and then put them in their original size on their websites. Such images can be heavy and a few megabytes, which greatly slows down the website and thus brings SEO penalties. For example, an image of 2500 × 1500 pixels makes it extremely difficult to display the web, and it is often shown in a miniature size of 250 × 150 pixels, so putting an image of that size on a web page is meaningless.

Each image needs to be minimized as much as possible in order for the page to load as quickly as possible because Google prefers fast pages in search results because users have neither the time nor the patience for websites that load slowly. In other words, you can have a bunch of attractive and large images on your website, but what good is it when visitors never find you on Google search?

In addition, keep in mind that if you have a high-speed Internet connection and some premium Internet packages, many still have regular or slower Internet connections. Therefore, even if your website opens quickly for you (which can also be affected by the stored memory, ie cookies ), this may not be the case for other visitors.

You can reduce images for a web page using applications such as  ImageOptim and web pages such as  JPEGmini and  PunyPNGIf these tools are too complicated for you for some reason, you can use simple and free online image editors.

Image Search – Additional visitors to your website


Many users choose to display only images in Google search when they search for certain products, services, or keywords. When they see what they are looking for, they click on the picture and go to the website to read more about the search term. Therefore, if you have SEO-optimized images, they can be found at the top of such searches, which means that you will attract more visitors and potential customers.


Summary: how to optimize images for a web page


  • Image title – do not put generic names but names that match the theme and keywords.
  • Alt text –  alt text or alt tag should contain a keyword or phrase related to the image.
  • Picture description  – in one or two sentences, briefly describe what the picture represents.
  • Frame text  – refers to a short description or comment of the content of the image that will be visible to visitors.
  • Image size – it is important that the size, ie the memory of the image is as small as possible, without losing too much on the image quality. It’s hard to say what the optimal size should be, but be sure to avoid images heavier than some 150kb.

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