Are you looking to speed up your website by optimising images without losing quality? Want to learn how to make your visuals boost your search rankings instead of slowing your site down?

You’ll find practical image SEO tips in this infographic.

Here’s a summary of what’s covered:

• Image Format
• Maximum File Sizes
• Best Image Sizes
• Compress
• ALT Tags
• Convert images to WebP

Check out the post below for more.

 

Website images do far more than make your pages look appealing. They play a major role in page speed, search engine rankings, and overall user experience. Search engines reward sites that load quickly and deliver smooth browsing, and your images are often the biggest files slowing things down.

With the right approach, you can dramatically improve performance without sacrificing visual quality. This guide walks you through essential image SEO steps to ensure your site loads fast and ranks better.

Image Format

Choosing the correct image format is the foundation of smart image optimisation. Different formats serve different purposes, and using the wrong one can hurt both load speed and clarity. For example, photographs handle compression differently to logos, and vector graphics behave differently to raster images. When you select formats based on usage, you ensure crisp visuals while keeping file sizes manageable.

• Use JPG/JPEG for photos and complex images with gradients and detail
• Choose PNG for transparent backgrounds, icons, and graphics requiring sharp edges
• Use SVG for logos and vector-based illustrations to keep them scalable and lightweight
• Avoid formats like TIFF or BMP online as they drastically increase file sizes

Maximum File Sizes

Search engines and users both expect fast-loading pages, and large image files are one of the most common performance bottlenecks on the web. Keeping images within recommended file size limits ensures quicker load times and smoother browsing. Even high-quality pictures can be compressed effectively with the right techniques. Prioritise visual quality while still reducing weight as much as possible.

• Keep JPG/JPEG images under 150KB where possible to balance clarity and speed
• Use a maximum of 100KB for PNG files to prevent unnecessary load delays
• Limit SVG files to around 50KB to maintain fast rendering times
• Always check file sizes before uploading rather than relying on CMS defaults

Best Image Sizes

Uploading oversized images that are then scaled down by your website wastes bandwidth and slows down pages. Instead, size images appropriately for where they will appear on the site. Matching image dimensions to their layout placement ensures fast loading and efficient delivery. By planning your dimensions ahead of time, you maintain quality without bloating your pages.

• Use 1920 × 1080px for full-screen hero images and large banner sections
• Size images to approximately 800 × 800px for two-column layouts and featured images
• Use 400 × 400px for three-column grid layouts and supporting visuals
• Always resize images before uploading instead of relying on CSS to scale them down

Compress

Even correctly sized images can still be too heavy if they are not compressed properly. Compression reduces file size without visibly reducing quality, making pages load faster and saving bandwidth. Modern tools make compression easy, and it should become a consistent part of your publishing workflow. Prioritising compression ensures that stunning visuals do not come at the cost of performance.

• Use Photoshop’s “Save for Web” feature to export optimised images
• Use online tools such as TinyJPG or TinyPNG to reduce file weight further
• Test both lossy and lossless compression options to find the right balance
• Compress images before upload, rather than relying solely on plugins

ALT Tags

Search engines cannot interpret the visual content of images, so they rely on text descriptions to understand context. ALT tags help your images appear in search results, improve relevance signals, and support visually impaired users. Good ALT descriptions also strengthen your on-page keyword strategy when applied naturally. Treat ALT text as part of your SEO writing, not an afterthought.

• Write descriptive ALT text that clearly conveys the subject of the image
• Include relevant keywords naturally without stuffing or over-optimising
• Use ALT tags to support accessibility by accurately describing the image purpose
• Avoid vague labels like “image1” or keyword-only strings that lack clarity

Convert Images to WebP

Modern websites benefit massively from using WebP, a next-generation format that delivers high-quality visuals with much smaller file sizes than JPG or PNG. Search engines favour sites that use efficient image formats, and WebP has quickly become the preferred choice for performance-focused websites. Converting your images to WebP ensures faster load speeds, smoother browsing, and stronger SEO signals without losing clarity. With the right tools, you can automate the conversion process so every image uploaded is optimised by default.

• Convert JPG and PNG files to WebP to reduce load time without hurting quality
• Use plugins like ShortPixel or Imagify to automatically generate WebP versions on upload
• Ensure your site serves fallback formats for older browsers that do not support WebP
• Test page speed before and after applying WebP to confirm performance improvements

Conclusion

Optimising images is no longer just a technical preference; it is essential for delivering a fast, search-friendly website that keeps visitors engaged and search engines happy. By choosing the right formats, keeping file sizes controlled, sizing images properly, and compressing them before upload, you remove one of the biggest barriers to site performance.

Adding clear ALT text helps search engines understand your content, while adopting modern formats like WebP ensures your site stays ahead of evolving performance standards. When you follow these steps consistently, your pages load faster, your organic visibility improves, and your users enjoy a smoother experience every time they visit.