Image SEO

Image SEO means optimizing images so they rank better in search engines and bring more traffic to your website. Since images can... 64% of the total weight of a website Optimization is crucial for making a difference. faster loading times and a better user experience.

Key facts at a glance:

• Faster loading times: 50% of users expect a website to be in under 2 seconds loads.
• Better visibility: Images appear approximately 38% of Google search results.
• Increased attention: Image captions 300% more attention than the main text.

Optimization strategies:

1. File names and alt text: Clear, descriptive names and alt text such as "cheesecake-with-strawberries.jpg".
2. Compression: Use formats such as WebP or AVIF, to reduce the file size.
3. Structured data: Use Schema.org, to better mark images for search engines.
4. Technical optimization: Implement Lazy Loading and responsive images for optimal display on all devices.

Recommended tools:

• TinyPNG: Saves up to 80% file size.
• Optimole: Reduces JPEG file sizes by up to 94,77%.

Quick comparison of image formats:

Tip: Over 58% of internet traffic comes from mobile devices – optimize your images for mobile devices to improve loading times and user experience.

And finally ...

Effective image SEO improves loading speed, increases visibility, and boosts user engagement. Start by optimizing your images to sustainably improve your website's performance.

File names and alt text

Rules for file names

The correct naming of image files plays a central role for a effective image SEOA well-chosen filename helps search engines to better understand and categorize the content.

Here are a few important tips:

• Use only lowercase letters.
• Words should be with Hyphens They should be separated (no underscores).
• Keep the file name on 5–6 words limited.
• Avoid special characters and use only letters and numbers.

A good filename combines the main keyword with a precise description. A generic name like "image1.jpg" should be replaced with something more descriptive, e.g., "cheesecake-with-strawberries.jpg". Once the filename is finalized, it's time to work on the alt text.

How to write effective alt text

Alt text is crucial for SEO and accessibility. It helps not only search engines but also users who rely on screen readers. John Mueller from Google explains.

To ensure your alt text is effective, please consider the following points:

• Maximum 125 characters use.
• The most important information includes to the beginning.
• With a End of point, so that screen readers can process the text correctly.
• Do not use filler words like "picture of" or "photo of".
• For multilingual websites, the alt texts should in all supported languages be available.

Good and bad examples

Here are some examples that show how filenames and alt text are implemented correctly or incorrectly:

Another example:

<img src="amp.png" alt="Orange AD30HTC - 30 Watt Verstärker">

Although the optimization takes some time, both image search and accessibility benefit considerably from it.

Image compression methods

Once filenames, alt text, and other metadata are optimized, the next step is the technical compression of the images. The goal: shorter loading times and better performance.

Image format selection

Choosing the right image format is crucial. WebP It often offers the best efficiency, as it compresses up to 26% better losslessly and 25-34% better lossily than older formats.

Compression tools

With the right tools, image sizes can be significantly reduced. Here are two popular options:

Optimole

• Reduces JPEG file sizes by up to 94,77%
• Supports files up to 5 MB
• Retains the original format
• Easy operation

TinyPNG

• Saves up to 80% of file size
• Available as a WordPress plugin
• Dropbox integration
• Supports JPEG, PNG, APNG and WebP

Image size standards

The correct image size is just as important as the format. Here's an overview of recommended sizes:

Tips for optimizing image size:

• Keep the file size below 500 KB, maximum 2 MB.
• Compress the images before uploading.
• Avoid CSS/HTML scaling.
• Think mobile: Over 50% of traffic comes from mobile devices.

Fast page loading is crucial: Over 50% of users abandon a website if it takes longer than three seconds to load. Tools like PageSpeed ​​Insights These measures help analyze and improve loading times. They optimize both SEO and user experience.

Structured data for images

Image optimization involves more than just file naming and image compression – structured data also plays a crucial role. It helps increase the visibility of your images in search results.

Schema.org is an initiative launched by Google, Microsoft, Yahoo, and Yandex. It is already used by more than 45 million web domains, which together have implemented over 450 billion Schema.org objects.

With this knowledge, you can now begin the integration on your website.

Technical optimization methods

After basic image optimization has been performed, this section focuses on technical fine-tuning. Modern methods help to load images faster and improve SEO visibility.

Set up lazy loading

Lazy loading means images are only loaded when they actually appear in the visible area. This saves loading time and bandwidth.

An example of native lazy loading:

Responsive image code

Responsive images allow image sizes to adapt to different screen widths. srcsetThe -attribute allows the browser to load the appropriate image version.

An example of responsive images with srcset:

For even better performance, a CDN (Content Delivery Network) can be used, which quickly provides images worldwide.

CDN Implementation

A CDN significantly reduces loading times by delivering images via global server locations. This can increase loading speed many times over.

For best results:

• Optimize images in size and format before uploading.
• Configure cache headers correctly
• Using a CDN with server locations in Switzerland
• Conduct regular performance checks

These steps improve image quality and simultaneously increase SEO effectiveness.