Image optimisation is an essential part of website management. When images are optimised correctly, they load faster, improve user experience, and can even contribute positively to search engine optimisation (SEO). In this guide, we’ll explore practical ways to optimise images for the web, with a focus on Australian spelling and best practices.
Why Image Optimisation Matters
Unoptimised images can slow down your website, leading to a poor user experience and lower search engine rankings. Google and other search engines prioritise fast-loading sites, so reducing the file size of your images without sacrificing quality is key to success.
When we hand over a website to a client, the biggest issue that occurs is images uploaded in large sizes. In particular, website galleries can be a problem as generally there are a large number of images and when each image is over 1MB it can cause a huge website page.
Let’s look at ways to optimise your website images to ensure a high-performing website.
1. Choose the Right Image Format: JPEG, PNG, or WebP.
Each image format serves a different purpose, and selecting the right one can significantly impact page speed. Here’s a quick rundown:
- JPEG: Ideal for photographs and images with lots of colour and detail. It offers good compression with minimal quality loss.
- PNG: Best for graphics with transparent backgrounds, icons, or simple images that need to remain sharp.
- WebP: A newer format that offers high-quality images at smaller file sizes than JPEG and PNG. Not all browsers support WebP, but it’s a great choice for modern websites with fallbacks.
2. Resize Images Before Uploading
One of the most common mistakes is uploading images directly from a camera or smartphone without resizing. Large, high-resolution images are unnecessary for web use and can drastically slow down load times. Instead, resize images to the exact dimensions required by your website layout.
For example, if your blog post images are displayed at 800 pixels wide, there’s no need to upload images that are 3000 pixels wide. Tools like Adobe Photoshop, GIMP, or even online tools such as TinyPNG can help resize and compress images effectively.
3. Compress Images to Reduce File Size
Compressing images is a simple yet effective way to reduce file size. There are two types of compression:
- Lossy Compression: Reduces file size by removing some image data. This can slightly reduce image quality but is often unnoticeable to users.
- Lossless Compression: This reduces file size without losing any quality. This is ideal for images where detail is important.
To compress images directly in the CMS, use tools like TinyPNG, JPEG-Optimizer, or plugins like Smush and ShortPixel for WordPress.
4. Use Descriptive Image File Names
Image file names should be descriptive and contain keywords relevant to your website. For example, instead of using “IMG_1234.jpg,” rename the image to something meaningful like “home-builder-melbourne.jpg.” Descriptive file names help search engines understand the content of your images, boosting SEO.
5. Add Alt Text for SEO and Accessibility
Alt text (alternative text) describes the content of an image. This text helps visually impaired users who rely on screen readers and assists search engines in interpreting the image content.
When writing alt text, keep it concise but descriptive, using relevant keywords. For instance, an image of a coffee cup in a Melbourne cafe could use the alt text: “Home Renovations in Melbourne” This improves accessibility and can help with search rankings for specific keywords.
6. Enable Lazy Loading for Faster Load Times
Lazy loading delays the loading of images until they are visible on the user’s screen, reducing initial load times. In WordPress, lazy loading can be enabled with plugins like Lazy Load by WP Rocket or through built-in options.
This feature is particularly useful on pages with many images, as it prevents unnecessary downloads and can significantly improve user experience on slower connections.
7. Utilise Responsive Images for Mobile Optimisation
Responsive images automatically adjust based on the device screen size, ensuring images load quickly without sacrificing quality. WordPress has built-in support for responsive images, which is especially useful given that mobile users are now a significant portion of web traffic.
8. Leverage Image Optimisation Plugins for WordPress
If your site runs on WordPress, there are several plugins designed specifically for image optimisation:
- Smush: Compresses and optimises images automatically.
- ShortPixel: Supports lossless and lossy compression, WebP conversion, and other features.
- Imagify: Integrates with WordPress for simple, automatic optimisation and resizing.
Image optimisation is vital for a fast, user-friendly, and SEO-friendly website. You can ensure your website runs smoothly across all devices by choosing the right image formats, resizing and compressing before uploading, and using tools like lazy loading and CDNs.
At Picasso Media, we can offer you support for your website (even if we didn’t build your website) or we can also do website training if you want to improve on your skills to assist your website.
