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Image optimization is an important SEO technique as it helps to increase website efficiency and usability, and also affects ranking. Since images are one of the biggest contributors to the size of web page, improving them will likely help to achieve quicker load time, less consumption of bandwidth, and improved overall site performance. Here are 10 effective ways to optimize images for the web:
When optimizing an image, the initial step involves choosing the correct file format of the image you wish to optimize. The three most common formats are JPEG, PNG, and GIF: The three most common formats are JPEG, PNG, and GIF:
i. JPEG is suitable with picture or image that has many colors and shades. It offers good compression rates, and typically generates very small files.
ii. PNG is more suitable for images that involve transparency or for objects with high contrast such as logos and icons. However, PNG files are larger file type, and the quality is better.
iii. GIF is perfect for simple animations and images with a low color range.
Choosing the right format to save, enables incremental reduction in size, while the desired image quality is preserved.
Compression makes the size of the images small, while the quality is not considerably affected. There are two types of compression:
i. Lossy compression ensure that the file size is smaller through the removal of part of the image data but at the same time the quality of the image may be slightly affected. Tools like JPEG Optimizer or TinyJPG are perfect for lossy compression.
ii. Lossless compression means all the image data are retained with no loss of quality, but this reduces the file size to a lesser degree. PNGGauntlet and ImageOptim are two best-known and widely used tools for lossless image compression.
For most of the cases, it is advisable to employ a mixed approach of lossy compression for web images as this will help maintain a reasonable file size and reasonable quality.
One mistake of many new website developers is still uploading unnecessarily large images that can slow down load times significantly. Crop images to the exact size you want them in your design. For instance, assuming that your website uses images at 800 x 600 pixel resolution, you don’t have to use an image at 2000 x 1500 pixels.
With image resizing software such as Adobe Photoshop, GIMP or online instruments such as ResizeImage. One thing that net has provided us is the ability to take our pictures and alter their sizes before uploading them to our site.
Image sprites is a concept of uniting more than one image into one file in order to minimize the amount of HTTP requests on the page. This technique is helpful for small images that are repeated on the screen such as icon images.
Instead of loading each image independently in the browser, one HTTP request loads one sprite file, and the CSS code displays the required part of the image. This can help reduce page loading time and enhance the overall functioning of your website.
Lazy loading is a process of loading pictures at a later stage, more precisely, it is when the pictures are loaded after they become visible on the screen as the user scrolls down. This way it minimizes the loading time of your webpage especially when you have numerous images on your website.
Lazy loading is easy to implement using libraries such as LazyLoad. js or by using the loading =” lazy “attribute in HTML5 for modern browsers.
A CDN replicates your pictures on servers in various geographical regions and serves them from the closest server to the user. This decreases the transfer time required for receiving images and helps those who are located far from your main web server.
Some known CDN solutions are Cloudflare, Amazon CloudFront, and Akamai which can enhance the speed of the loading images and the whole website.
Browser caching is where images and other web files are saved locally, the first time the user visits the website so that they don’t have to reload each time they visit the website. This makes pages load faster and consumes minimal bandwidth.
For caching within the browser, one may need to tweak his or her web server settings or install plugins provided for popular CMS like WordPress. Make sure cache headers are properly configured to indicate how long pictures should be cached.
SVG is a type of image format that works very well with vector formats and is commonly used in logos, icons, and other graphical features that need to be scaled. SVG files are vector pictures, so, they do not lose resolution every time you resize them, like raster images JPEG, PNG, etc.
SVG files are typically smaller compared to raster images mainly because SVG pictures are plain text documents. These elements can also be controlled by CSS and JavaScript, making the choice of using them for responsive designs flexible.
Although, alt text does not have a direct effect on file size or loading time, it is still an important component of SEO and accessibility. The use of alt text is beneficial since it entails a textual explanation of the image, thereby enabling the search engines to get an understanding on what the image contains and where it is likely to fit.
When implementing alt text ensure that it is concise, relevant to the image and if possible, incorporate any keyword. This helps in improving the ranking of your site on search engine result pages, and makes web users with screen reader devices more comfortable.
WebP is a new generation image format that was released by Google, and it offers better compression rates without sacrificing the image quality. WebP files are 25–34% lesser in size than similar JPEG and PNG files which makes them ideal for web developers.
Currently, every new browser has WebP integrated and format can be easily converted using tools, such as Squoosh or Image Converting Plugins for WP. WebP is a format that can help you download pictures much faster and save a lot of disk space, which is why other developers are using it.
It is important for any web developer or owner to know how to properly optimize images for the web. With these 10 techniques, such as choosing the right file format, minimizing image size, using the right image size, sprites, lazy loading, CDN, caching, using SVG, optimizing ALT, and WebP, you can be able to improve the loading speed, the experience of users, and search engine ranking of your site. It must be understood that optimization is not a one-time operation; always go through the images and update them, where necessary, to abide by the current web standards.
Do you want to have a website that attracts attention and wows visitors? Then, we are prepared to assist! Contact us by clicking the button below to share your thoughts with us.
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Poland Web Designer (Wispaz Technologies) is a leading technology solutions provider dedicated to creating innovative applications that address the needs of corporate businesses and individuals.