How to Optimise Images for SEO

30 June 2026·1 min read

Quick answer: Optimise images for SEO by compressing them so they load fast, using descriptive file names, adding alt text that describes the image (which helps accessibility and image search), choosing the right format, and sizing them correctly. Well-optimised images improve page speed and can bring extra traffic from Google Images — poorly optimised ones slow your site and hurt rankings. 📈

Images make your pages better — but only if they’re optimised. Here’s how to get it right. 💖

How to optimise images

Compress them — fast loading
Descriptive file names — not IMG_1234
Add alt text — describe the image
Right format — modern, efficient
Correct size — don’t upload huge

💡 Fast and described. Two quick wins: compress every image so it doesn’t slow your page, and write alt text describing it. The first protects your speed and rankings; the second helps accessibility and Google Images traffic.

Frequently asked questions

How do I optimise images for SEO?

Compress them for fast loading, use descriptive file names, add alt text describing the image, choose an efficient format, and size them correctly. This improves page speed and can bring traffic from image search.

What is alt text?

Alt text is a short description of an image in the page code. It helps screen readers (accessibility) and helps Google understand the image, which supports image search visibility. Describe the image clearly and naturally.

Do images affect page speed?

Yes — large, uncompressed images are a top cause of slow pages, and slow pages hurt rankings and conversions. Always compress and size images correctly before uploading.

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Written by

Kate, founder of Chronically Online

I help Gold Coast and Brisbane businesses grow with branding, websites and marketing that actually works.

Work with me ✦