Image SEO helps Australian buyers find your products and premises through Google Images, and keeps your pages quick enough that they stay to enquire. It comes down to five habits: descriptive alt text, short file names, a supported format, compression, and a sitemap entry for any image Google misses. Of these, alt text matters most. Google names it the most important attribute for image metadata and warns against filling it with keywords (Google Search Central, image SEO best practices). The ten practices below form Aemorph's practical image SEO checklist for Australian sites.
Why Does Image Optimisation Matter for Australian Websites?
Well-handled images bring Australian visitors in from Google Images and keep pages fast, and both feed enquiries and sales. Images show in image search results and next to web results, so a clearly described image opens a second path to your page. A sharp, relevant photo earns the click; an oversized file slows the page down. Google says images are often the largest contributor to overall page size, and points site owners to PageSpeed Insights to check speed.
Which Search Engines Matter for Australian Image SEO?
Google held 87.9% of search engine market share in Australia in September 2026 and Bing 9.17% (StatCounter), so Australian image work follows Google's guidance first and is checked in Bing as well. Aemorph verifies Australian client sites in Google Search Console and Bing Webmaster Tools, so image and page problems surface in both. DataReportal counts 26.2 million Australian internet users as of October 2025.
| Measure | Figure | Market and date | Source |
|---|---|---|---|
| Google search engine market share | 87.9% | Australia, September 2026 | StatCounter |
| Bing search engine market share | 9.17% | Australia, September 2026 | StatCounter |
| Internet users | 26.2 million, 97.1% of the population | Australia, as of October 2025 | DataReportal |
| Monthly searches for "image seo" | About 30 | Australia, 24 October 2026 | Ahrefs Keywords Explorer |
Sources: StatCounter, Australia, September 2026; DataReportal, as of October 2025; Ahrefs, 24 October 2026.
Which Ten Image SEO Practices Matter for Australian Sites?
The ten practices cover what each image shows, how you describe it and how it loads.
| # | Practice | What you do | Primary effect | Where it applies |
|---|---|---|---|---|
| 1 | Use original images | Photograph your own products, team, premises and data | Differentiation, brand recognition | Every page with a photo |
| 2 | Choose the right format | Pick the format that suits the image type | File size, quality | Every image |
| 3 | Compress every file | Export at display size, then compress | Load speed | Every image |
| 4 | Name files descriptively | Swap camera defaults for plain words | Context for search engines | Every image |
| 5 | Write unique alt text | Describe the specific image in a sentence | Image search, accessibility | Every meaningful image |
| 6 | Serve responsive sizes | Use srcset or picture with a src fallback | Load speed on mobile | Large and hero images |
| 7 | Add images to a sitemap | List the images Google misses | Discovery | Script-loaded or CDN-hosted images |
| 8 | Add structured data | Mark up the image property | Rich results eligibility | Product, recipe and video pages |
| 9 | Lazy load below the fold | Hold back off-screen images | Initial load speed | Long pages and galleries |
| 10 | Test speed after changes | Compare before and after | Verification | Each batch of changes |
Ten image SEO practices for Australian websites. Source: Google Search Central, image SEO best practices, October 2026.
1. Use original images of your Australian business
Your own photos and graphics set your pages apart from the many sites running the same stock files. Photograph your products, team and premises; chart your own data. Original visuals keep your look consistent, and they give other Australian sites something worth crediting with a link.
2. Choose the right format
Google Search supports BMP, GIF, JPEG, PNG, WebP, SVG and AVIF, and advises that the file extension match the real file type (Google Search Central). Photographs suit JPEG or WebP; graphics that need transparency suit PNG; logos and icons suit SVG. Use AVIF where your tools support it and the saving is worth the extra step.
3. Compress every file
Compress every image before it goes live, so each page loads faster for Australian visitors. Export at the largest size the layout shows, raise compression until the loss becomes visible, then step back one level. Build the step into your publishing tool or media library so no editor skips it.
4. Name files descriptively
Give each file a short, plain name that says what the image shows, such as the product or subject, with hyphens between words. Google reads the file name as a light clue to the subject, so a clear name helps without carrying the ranking weight. Replace camera defaults such as IMG_2041.
5. Write unique alt text
Write alt text that describes what the image shows, in a natural sentence, for people who are unable to see it. Screen readers read it aloud, and search engines use it to understand the image. Describe the specific image, give decorative images empty alt text, and never repeat one keyword string across a page. The Australian Human Rights Commission's Guidelines on equal access to digital goods and services (April 2025), issued under the Disability Discrimination Act 1992 (Cth) and not legally binding, name WCAG as the applicable international standard for web accessibility and note that many websites lack alternative text for images. Accessibility obligations sit with your business.
General guidance, not legal advice.
6. Serve responsive sizes
Use the picture element or the srcset attribute so each device downloads a size that suits it, with a fallback in the src attribute, as Google recommends. A phone then skips the weight of a desktop hero image.
7. Add images to a sitemap
An image sitemap lists the images Google otherwise misses, including images served from a CDN on another domain. Add one when scripts load your images or galleries hide them from the crawler.
8. Add structured data
Image structured data makes an image eligible for badges and rich results in Google Images, and Google lists the image property as required for that eligibility. Use the markup that fits the content type, such as product, recipe or video, and keep every value identical to what the page shows.
9. Lazy load below the fold
Lazy loading holds back images until a visitor scrolls near them, which shortens the first load. Never lazy load the main hero image, since that delays the largest element a visitor sees. Check the rendered page to confirm lazy-loaded images still appear in the HTML Google processes.
10. Test speed after changes
Run PageSpeed Insights before and after each batch of image changes, and compare largest contentful paint and total page weight. A fix that moves neither number needs a second look at the cause.
How Do Images Relate to Your Wider On-Page Work in Australia?
Images are one pass in a full on-page review, beside titles, headings, content and speed, and together they decide how many Australian buyers find your pages and stay. Add image checks to your crawl export, so missing alt text and heavy files appear in the same report as every other issue. Follow the full sequence in the on-page SEO audit guide, pair descriptive alt text on linked images with the rules in the anchor text guide, and compare tools in the image optimisation tools guide.
Case study · Outdoor furniture retail, Australia
Remarkable Furniture grew organic traffic 213% in 13 months.
Monthly organic visits rose from 3,883 in September 2019 to 12,172 in October 2020, an annualised 187%. Read the Remarkable Furniture case study
Source: Ahrefs organic traffic, August 2026. A whole-programme organic SEO result for an Australian retailer with showrooms, not an image-only result. How results are measured
For the wider programme, read what SEO is and see the technical SEO service.