10 Image Optimisation Tips to Enhance Your Website’s Speed and SEO

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Images are a crucial element of any website. They enhance the visual appeal, engage visitors, and can significantly impact your site’s performance and SEO. However, simply adding images to your website isn’t enough. To truly benefit from them, you need to optimise these images correctly. This guide will walk you through the best practices for image optimisation, ensuring your site looks great and performs even better.

1) Why Image Optimisation Matters

Optimising images is essential for several reasons:

  1. Improved Load Times: Optimised images load faster, reducing the time visitors spend waiting for your pages to appear.
  2. Better SEO: Search engines favour fast-loading websites, and well-optimised images can improve your site’s ranking.
  3. Enhanced User Experience: Faster load times and clear images lead to a better user experience, encouraging visitors to stay longer and explore more.

2) Choosing the Right File Format

Selecting the appropriate file format for your images can make a significant difference in quality and load time. Here’s a quick guide:

  • JPEG: Best for photographs and images with many colours.
  • PNG: Ideal for images with transparent backgrounds.
  • GIF: Use for simple animations.
  • WebP: Great for modern browsers, offering superior compression.

3) Compressing Images

Compression reduces file size without compromising quality. Use these tools to compress your images:

Steps to Compress:

  1. Upload Your Image: Open the compression tool and upload your image.
  2. Download the Compressed Version: After compression, download the optimised image.
  3. Replace the Original Image: Update your website with the compressed image to improve load times.

4) Resizing Images

Ensure your images are the right dimensions for their use to avoid unnecessary large files that slow down your site.

Steps to Resize:

  1. Open Your Image in the Tool: Use Canva or Photoshop to open your image.
  2. Select the Resize Option: Choose the appropriate dimensions for your website.
  3. Save the Resized Image: Save and upload the resized image to your website.

5) Descriptive File Names

Use relevant keywords in your file names to boost SEO.


  • Good: massage-therapy-session.jpg
  • Bad: IMG12345.jpg

Tips for File Names:

  1. Be Descriptive: Clearly describe the image content.
  2. Use Keywords: Include relevant keywords to enhance SEO.
  3. Avoid Spaces: Use hyphens instead of spaces.

6) Adding Alt Text

Alt text helps with accessibility and SEO.


  1. Describe the Image: Provide a detailed description.
  2. Include Keywords: Use relevant keywords naturally.


  • Alt Text: “A serene massage therapy session with a therapist working on a client’s back.”

7) Implementing Lazy Loading

Lazy loading improves site speed by loading images only when they enter the viewport.

Steps for WordPress:

  1. Install a Lazy Loading Plugin: Use plugins like Lazy Load by WP Rocket.
  2. Activate the Plugin: Follow the setup instructions.
  3. Configure Settings: Adjust the settings to fit your needs.

8) Using a Content Delivery Network (CDN)

A CDN improves load times by serving images from servers closest to your users.

Steps to Set Up:

  1. Sign Up for a CDN Service: Choose a CDN provider and create an account.
  2. Integrate with Your Website: Follow the provider’s instructions for integration.
  3. Test Your Site: Ensure images load correctly and quickly.

9) Leveraging Browser Caching

Browser caching stores copies of images locally, reducing load times on subsequent visits.

Steps for WordPress:

  1. Install a Caching Plugin: Use plugins like W3 Total Cache.
  2. Configure the Plugin: Set up caching for images and other content.
  3. Test Your Settings: Ensure caching is working effectively.

10) Advanced Techniques

Image Sitemaps

Creating an image sitemap can help search engines better understand the images on your site.

Steps to Create an Image Sitemap:

  1. Use a Plugin: For WordPress, try using the Google XML Sitemap for Images plugin.
  2. Generate the Sitemap: Follow the plugin instructions to generate the sitemap.
  3. Submit to Google Search Console: Add the sitemap to your Google Search Console account for better indexing.

Analysing Image Performance

Regularly check the performance of your images using tools like Google Analytics.


  1. Set Up Google Analytics: Create an account and set up tracking on your website.
  2. Monitor Image Load Times: Use the Behaviour > Site Speed > Page Timings report to see how your images are performing.
  3. Optimise Based on Data: Make adjustments based on the performance data to continually improve your site speed.


Optimising your images is not just about making your website look good; it’s about improving load times, enhancing user experience, and boosting your SEO. By following these best practices, you’ll ensure that your website performs at its best, providing a seamless experience for your visitors.

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