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Alt text (short for alternative text) is a written description you add to an image so software and search engines can understand what the picture shows. It serves two big jobs at once. First, it lets screen readers describe images out loud to people who cannot see them. Second, it helps Google and AI engines figure out what an image contains, which supports your image SEO.
Every image on a web page can carry a hidden text description in its code. That description is the alt attribute, and the words inside it are the alt text. Think of it like a caption that only machines read. The picture itself never changes, but now software has a way to explain it.
A screen reader is software that reads a web page out loud for people who are blind or have low vision. When it reaches an image, it cannot guess what the photo shows. Instead, it reads the alt text you wrote. So a blank alt field leaves that shopper with silence, or a robotic reading of a messy file name like “IMG_4821.jpg”.
Good alt text turns that moment into something useful. For example, “red leather crossbody bag with gold buckle” tells the shopper exactly what is on screen. This is also a compliance issue, since accessibility guidelines expect meaningful images to have text alternatives.
Search engines read images far better than they used to, but they still lean on your alt text for context. It works like a name tag at a busy event: it tells Google who the image is before any deeper analysis. That context helps your product photos show up in Google Images, which can be a quiet source of extra organic traffic.
The stakes are real, because organic search drives roughly 53.3% of all website traffic. AI engines that summarize the web use the same descriptive signals to understand and reference your images. Clear alt text gives them a cleaner, more accurate picture to work with.
In WooCommerce, you set alt text in the media library or the product image panel. The best descriptions are specific and natural, not a pile of keywords. Aim for a short phrase a human would actually say out loud.
Blank fields are a widespread problem, not a rare slip. In one large accessibility study, 16.2% of home page images were missing alternative text entirely. For a store with hundreds of products, an SEO plugin like AIOSEO or Yoast helps you spot and manage image details at scale. Pairing clear alt text with product schema gives search engines an even richer view of each item.
A few habits quietly cancel out the benefit of alt text. The biggest is keyword-stuffing, where you cram in phrases like “coffee mug buy cheap best mug sale”. Google reads this as spam, and a screen reader turns it into a confusing jumble. Instead, describe the item the way you would to a friend on the phone.
Another trap is copying the same description across many photos. If a product has three angles, each shot deserves its own note, such as “front”, “side”, and “close-up of strap”. Meanwhile, avoid starting every entry with “image of”, since screen readers already announce that it is an image. These small fixes keep your catalog clean and genuinely helpful.
Imagine a mid-sized WooCommerce store called Fern & Clay that sells handmade planters. It has 400 product photos, and most alt fields are blank or set to file names. The owner decides to fix this over one weekend.
She rewrites each field with a plain description, like “speckled blue stoneware planter with drainage tray”. Now screen-reader shoppers hear exactly what they are browsing. Google also gains clean context for every image in the catalog.
Over the next few months, several planter photos start ranking in Google Images. That matters because the top three organic results capture 54.4% of all clicks. As a result, visibility near the top compounds fast. Even her best single listing benefits, since the number one result alone averages a 27.6% click-through rate.
The weekend of work pays off in two ways. Fern & Clay becomes usable for more shoppers, and it earns image traffic it never captured before. In practice, that is the double win alt text is built for.
People often confuse alt text with the image title attribute, but they do very different things. The title attribute usually shows as a small tooltip when someone hovers over an image with a mouse. It is optional, and it carries little weight for either accessibility or SEO.
Alt text is the one that matters. Screen readers rely on it, while tooltips are skipped or read inconsistently. Search engines also treat alt text as the real description of an image, not the title.
So the title attribute is a nice-to-have, not a substitute. If you only have time for one field, always fill in the alt text. Think of alt text as the label on a package, while the title is a sticky note that most people never see.
The image file name sits in a similar spot. A clean name like “blue-ceramic-planter.jpg” gives a minor context boost, but it cannot describe the image to a screen reader. Alt text remains the only field that does both jobs well, so it earns your attention first.
Keep it short and specific, usually around a sentence or less. Most screen readers handle roughly 125 characters comfortably. Describe what the image shows, then stop. There is no need to write a paragraph or repeat keywords.
Not always. If an image is purely decorative, like a background flourish, you can leave the alt attribute empty on purpose. That tells screen readers to skip it politely. Product photos and any meaningful image, however, should always have a description.
Yes, though it is one signal among many. Alt text helps your images rank in Google Images and adds context to the page overall. It pairs well with other on-page basics like your title tag, your meta description, and smart internal linking.
Alt text is a small field with outsized impact on your store. It makes your images usable for screen-reader shoppers and readable for search and AI engines. Fill it in with clear, honest descriptions, and you serve accessibility and image SEO in a single step.
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