When an SEO company optimizes the images on a website, it works through a sequence of steps that make each image smaller, faster to load, easier for search engines to understand, and more likely to appear in image search. The goal is to keep images looking sharp to visitors while removing the weight and ambiguity that slow pages down or hide images from search. Here is how that process typically works.
Choosing modern formats and compressing files
The first step is usually format and compression. Older formats like JPEG and PNG are heavier than newer ones, so an SEO company will often convert images to modern formats such as WebP or AVIF, which produce noticeably smaller files at comparable visual quality. Compression is applied carefully, so the file size drops without any quality loss that a visitor would actually notice. For browsers that do not support the newest formats, the company sets up a fallback so an older format is served instead, keeping the image visible for everyone.
Sizing images to display dimensions
A common problem on unoptimized sites is images uploaded at far larger dimensions than they are ever displayed. The browser then downloads a large file and shrinks it on screen, wasting bandwidth and slowing the page. An SEO company resizes images so their actual dimensions match the space they occupy in the layout. It also reserves that space in the page code, which prevents the layout from shifting around as images load, a stability issue that affects both user experience and Core Web Vitals scores.
Descriptive file names and alt text
Search engines rely on text cues to understand what an image shows. An SEO company replaces generic camera file names, such as a string of numbers, with short descriptive names that reflect the actual content of the image. It also writes alt text for each meaningful image. Alt text serves two purposes: it describes the image for people using screen readers, and it gives search engines context about the image. Good alt text describes the image plainly and accurately rather than stuffing in keywords, since unnatural alt text harms accessibility and does not help rankings.
Lazy loading and responsive images
Lazy loading tells the browser to delay loading images that are below the visible area until the visitor scrolls toward them. This speeds up the initial page load and saves bandwidth. An SEO company applies lazy loading to off-screen images, but deliberately leaves the main above-the-fold image loading immediately, because delaying that image would slow down the metric Google uses to measure when the main content appears.
Responsive images are the related step. Instead of serving one image to every device, the company provides several versions at different sizes and lets the browser pick the most appropriate one for the visitor’s screen. A small phone screen receives a smaller file, while a large desktop monitor receives a sharper one. This is handled through standard HTML attributes that browsers already understand.
Image sitemaps and optimizing for image search
To help search engines find every image, an SEO company can list image URLs in a sitemap. This is especially useful when images are loaded through scripts that a crawler might not fully process on its own. Listing the images makes them easier to discover and index.
Optimizing for image search pulls these steps together. Images that load quickly, carry descriptive file names and alt text, sit near relevant on-page text, and are technically accessible to crawlers have a far better chance of appearing in image search results and visual search tools. The surrounding page content matters too, since search engines read the words around an image to judge what it represents.
A repeatable process, not a one-time task
A capable SEO company treats image optimization as a documented, repeatable workflow rather than a single cleanup. It sets standards for formats, sizes, naming, and alt text, applies them across the existing site, and builds them into how new images are added. The result is a site where images stay light, load fast, remain accessible, and contribute to search visibility over time.