Image SEO And The Easiest Wins Left

Images are where most service sites leak performance. They are the largest files on the page, they are rarely described properly, and they are almost never named in a way that means anything.

Which makes image work one of the few remaining jobs where a morning produces a measurable result.

Filenames

A file called IMG_4471.jpg tells a search engine nothing. A file called steel-balustrade-install-cronulla.jpg tells it the subject, the work and the place.

Rename before upload, in words, hyphen separated, describing what is actually in the frame. Not keyword stuffed, described. This is a two second step per image and it is skipped on almost every site we audit.

Alt text

Alt text exists for people using a screen reader, and it is read by crawlers as a description of the image.

So it describes the image rather than repeating the page heading. "Installed steel balustrade on a residential balcony in Cronulla" is alt text. "Balustrades Sydney balustrade installation Sydney balustrades" is a penalty waiting to happen.

Decorative images, the background textures and dividers, take an empty alt attribute rather than a description, because describing them makes the page worse to listen to.

Format and size

Modern formats, because they are substantially smaller at the same visual quality than the JPEG that came out of the camera.

Sized to the slot, which is the biggest win on most sites. A hero image served at 4000 pixels wide into a container that is 1200 wide is wasting three quarters of the bytes it downloaded.

Responsive sources, so a phone gets a phone sized file rather than the desktop one.

Compressed, which on a photographic image is a very large saving for a difference nobody can see.

Most service sites could cut their total page weight by half with nothing but image work, and page weight is the ceiling on the speed numbers everything else is measured against.

Dimensions declared

Width and height attributes, always, so the browser reserves the space before the image arrives.

Without them the page reflows as each image loads, which is the layout shift metric and the most irritating thing a visitor experiences. It is also the easiest of the three speed metrics to fix permanently.

Loading behaviour

Below the fold images load lazily. The hero image does not, and getting that the wrong way round is one of the most common self inflicted speed problems there is.

The image that is visible on arrival should be requested early and with priority. Everything further down the page waits until it is needed.

Image search is still traffic

For anything physical, image search sends real visitors, and it is a channel almost nobody works on.

Products, finished installations, before and after sequences, materials, site photography. A business with four hundred real photos of its own work and none of them named or described is sitting on a channel it never switched on.

The requirement is the same three things: a real photo, a descriptive filename, and alt text that says what it is. Then the image sits on a page with text around it that gives it context, because an image on a bare gallery page has nothing to rank for.

Structured data

Where images belong to a product, a project or an article, they go into the structured data for that entity rather than existing only in the markup.

Which is how an image gets attached to the thing it depicts rather than to the page it happens to sit on, and it is the difference between an image that can be surfaced and one that cannot.

The gallery problem

Most service sites have a gallery page: forty photos, no text, no structure, one URL.

That page cannot rank for anything, cannot be cited, and buries forty assets behind one title. The fix is project pages: one page per job, with photos, a description, the materials, the location and the outcome. Forty assets become twenty pages that each have something to say.

That is also the content that gets quoted by AI search, because it contains facts rather than pictures.

What to do first

Audit the four heaviest images on the homepage and the main service pages. Resize, convert, compress, declare dimensions, fix the loading order.

Then rename and describe everything new from the day you start, so the problem stops growing while you work through the backlog.

What this unlocks: a faster site, an accessible one, and a channel sitting unused in your category.