What is Alt text?

Alt text (short for "alternative text") is a short written description of an image, written into your site's code so it can be read aloud by screen readers and understood by search engines. It's the sentence that takes the place of a picture when the picture can't be seen — by a shopper using assistive technology, by a browser that fails to load the file, or by Google trying to figure out what's actually in your photo. For a first-time founder, alt text is one of those tiny details that quietly does three jobs at once: it makes your store usable for everyone, it helps your product photos show up in image search, and it keeps you on the right side of accessibility law. It costs nothing but a few honest words per image.

Why Alt text matters

Start with the people. According to the World Health Organization, at least 2.2 billion people worldwide live with near or distance vision impairment, and roughly 43 million are blind. Many of them browse and buy online using screen readers — software that reads a web page aloud, including the alt text on every image. When you skip alt text on a product photo, a blind shopper hears silence, or worse, a meaningless file name like "IMG_4471.jpg." They can't tell your navy hoodie from your charcoal one, so they leave. Research summarized by Fable found that 50% of people with disabilities shop online for physical products at least once a week — this is not a niche audience, it's a weekly customer you're turning away.

And yet most of the web still gets this wrong. The WebAIM Million 2025 report, which scans the top one million home pages every year, found that missing alternative text on images is one of the most common accessibility failures and has been for the last five years running. Across e-commerce specifically, one analysis cited by Nuform Social found that 63% of websites have missing or inadequate alt text. That's a problem for shoppers — but it's also an opening for you. If most stores are doing this badly, doing it well is a cheap way to stand out in both accessibility and search.

There's a legal dimension too, and it's not abstract. In 2024 there were roughly 2,452 website accessibility lawsuits filed under ADA Title III in U.S. federal court, with about 69% of them targeting e-commerce sites, according to data summarized by AudioEye. Missing alt text on product images is one of the single most common complaints plaintiffs raise. You don't need to be a big brand to get a demand letter — small online stores get them too. Good alt text is one of the easiest boxes to check on the road to an accessible, defensible store, and it sits alongside your SSL setup and privacy policy as part of "this is a real, professional business."

Finally, there's discovery. Google confirmed it uses alt text, alongside computer vision and surrounding page content, to understand what an image shows — and it's a confirmed ranking signal for Google Image Search. With Google Lens now handling billions of visual searches a month and a large share of them carrying shopping intent, the picture of your product is increasingly a doorway into your store. Alt text is part of how that doorway gets found. This makes it a quiet but real pillar of e-commerce SEO.

It's worth sitting with the money side for a second, because "accessibility" can sound like a compliance cost rather than a growth lever — and that framing is backwards. The disability community's disposable income is estimated at roughly $1.9 trillion globally, and inaccessible sites quietly leak a chunk of that to competitors every day. When a screen-reader user hits a wall of unlabeled product photos, they don't email you to complain; they tab away to a store that works, and you never even see the lost sale in your analytics. Alt text is one of the lowest-effort ways to keep that shopper — and the friend they tell. For a brand-new founder still defining a target audience, writing off any segment of buyers before you've sold a single unit makes no sense. Accessible-by-default is simply a wider net.

How Alt text works

Under the hood, alt text lives in the HTML of every image as an alt attribute — for example, <img src="lavender-candle.jpg" alt="Hand-poured lavender soy candle in a frosted glass jar">. You almost never edit raw code, though. Your store builder gives you a plain text box next to each image. Here's the workflow, step by step:

1. Look at the image as if describing it on the phone. Imagine telling a friend what's in the photo in one breath. That's your starting draft.
2. Lead with the subject, then the meaningful details. What is it, what color, what material, what's it doing? "Charcoal wool beanie folded on a wooden table" beats "beanie."
3. Keep it short — roughly 8 to 16 words. Most screen readers and search tools handle up to about 125 characters comfortably before the description gets truncated or feels bloated.
4. Skip "image of" and "photo of." Screen readers already announce that it's an image. Starting with "picture of" just wastes the listener's time.
5. Work the product keyword in naturally — once. If your product description targets "lavender soy candle," let those words appear in the alt text where they genuinely fit, not jammed in three times.
6. Use empty alt (alt="") for purely decorative images. Background swirls, divider lines, and pattern flourishes carry no information. An empty alt attribute tells screen readers to skip them silently, which is correct — describing them would be noise.
7. Name the file sensibly too. "blue-ceramic-mug.jpg" gives Google another honest signal; "DSC00219.jpg" gives it nothing.

One nuance worth knowing: if an image is also a link or a button, the alt text should describe where it goes, not just what it shows. A logo in the header that links home should read something like "Maya's Candle Co. — home," not "candle logo." This small distinction is exactly the kind of thing the WebAIM guidance flags as a frequent mistake, and it ties into how a well-built online store handles its logo and navigation.

A few image types trip up first-timers because they need a different approach than a plain product shot. It helps to have a mental rule for each:

• Product photos get a full, specific description — type, color, material, notable detail. These are the ones search and screen readers care about most.
• Infographics and charts need their actual data point summarized, not "an infographic." If a graphic says "Free shipping over $50," the alt text should say "Free shipping on orders over $50," because that's the information the image is delivering.
• Text inside images — a sale banner that reads "20% off this weekend" — must be repeated verbatim in the alt text, or a screen-reader user misses the offer entirely.
• Icons that do something (a magnifying-glass search icon, a cart icon) should describe the function: "Search" or "View cart," not "magnifying glass."
• Decorative or repeated images get alt="" so they're skipped.

Once you've internalized those five buckets, alt text stops feeling like a guessing game. You glance at an image, ask "which bucket is this?", and the right kind of description almost writes itself. This is also the moment to think about product photography as a system rather than a pile of files — clean, well-lit shots are easier to describe accurately, and accurate descriptions are what both shoppers and Google reward.

A real-feeling example

Say Maya runs a small soy-candle store she launched from her kitchen. She has 24 products, and each one has four photos — so 96 images. When she first opened, she uploaded everything fast and left the alt text blank. Her product photos were beautiful, but invisible to Google Images and silent to screen readers.

Over one quiet Sunday, Maya wrote alt text for all 96. For the hero shot of her best seller she wrote: "Hand-poured lavender soy candle in a frosted glass jar with a wooden wick." For a lifestyle photo: "Lit lavender candle on a nightstand beside an open book." For the decorative swirl behind her testimonials, she set alt="". The whole job took about 70 minutes — under a minute per image.

Eight weeks later, her store analytics showed something new. Google Search Console reported 410 impressions in Google Images for queries like "wooden wick lavender candle," up from basically zero, and 28 clicks landing straight on product pages — visitors who found her through a photo, not text. Two of those turned into sales at a roughly $32 average order value. Meanwhile, a customer who used a screen reader emailed to say hers was the first candle shop she could actually shop independently — and ordered three. None of this required a redesign or a dollar of ad spend. It required 96 honest sentences, and it nudged her conversion rate up at the same time.

The compounding part is what makes Maya's Sunday worth it. Those 96 sentences don't expire. Six months on, that lavender candle ranks for three more image queries she never targeted, because Google's computer vision plus her honest alt text together mapped the photo to phrases shoppers actually type. When she later ran a small batch of retargeting ads, the product pages they pointed to were already clean, fast, and properly described — so the traffic she paid for converted a little better too. One unglamorous afternoon of writing kept paying her back across organic search, paid traffic, and accessibility all at once. That's the quiet leverage of getting the fundamentals right early, before the catalog grows to 200 products and the backlog feels impossible.

Alt text in practice: a writing formula and a checklist

Most founders freeze because they think alt text is an art. It isn't — it's a small format you can repeat. A reliable formula for product images:

[Product type] + [key attribute: color/material/style] + [context if useful]

• "Terracotta ceramic plant pot with drainage tray, 6-inch"
• "Women's olive-green linen jumpsuit with cropped wide-leg fit"
• "Stainless steel pour-over coffee dripper on a marble counter"

Notice each one names the thing, then earns its keywords by simply being accurate. That accuracy is the whole game. As Google's own Search Central documentation puts it:

Google uses alt text along with computer vision algorithms and the contents of the page to understand the subject matter of the image. Also, alt text in images is useful as anchor text if you decide to use an image as a link.

Before you publish a batch of images, run them through this quick checklist:

• Does the alt text describe what's actually in the frame, accurately?
• Is it under ~125 characters?
• Did you drop "image of" / "photo of"?
• Is the product keyword present once, naturally?
• Are purely decorative images set to alt=""?
• Do linked images describe the destination, not just the picture?
• Are file names descriptive too?

The payoff is bigger than most founders expect. Digital Applied reports that Google Images drives around 22% of all web searches, with visual search via Lens growing roughly 30% year over year. For a product business, that's an entire search channel — one your competitors are mostly ignoring, since the majority of stores still don't write proper alt text. Pairing strong alt text with clean structured data and a sharp title tag and meta description turns each product page into something both humans and machines can read.

Alt text vs. captions vs. title attributes

First-timers often blur three different things that all sound like "text near an image." They are not interchangeable, and using one for another is a common reason alt text fails to do its job.

• Alt text is the description in the image's code, read by screen readers and search engines. The shopper usually never sees it on screen — it's there for accessibility and discovery. This is the one that matters most for SEO and ADA compliance.
• Captions are the visible text printed below or beside an image for everyone to read. A caption like "Our candles are poured in small batches in Austin" adds context and personality, but it does not replace alt text — sighted and screen-reader users both benefit from the two working together.
• Title attribute is the little tooltip that pops up when you hover a mouse over an image. It's optional, inconsistently supported, and ignored by many screen readers and touch devices. Don't rely on it for anything important, and never use it as a substitute for alt text.

The simple rule: alt text answers "what is this image, for someone who can't see it?" Captions answer "what extra context do I want everyone to read?" When you nail the difference, your product pages read cleanly to people, to Google, and to the AI assistants now summarizing the web. That last audience is growing fast — solid image descriptions feed into answer engine optimization and how tools surface your store, the same way they feed schema markup and AI crawlers.

Benchmarks: where good stores actually land

If you want a target to aim at, here's what "done well" looks like in practice, drawn from how strong e-commerce stores handle their images:

• Coverage: 100% of informative images have alt text; decorative ones are correctly set to alt="". There's no in-between to aim for — every meaningful image gets described.
• Length: the bulk of descriptions land between 40 and 125 characters. Short enough to stay clean, long enough to be specific.
• Keyword presence: the main product keyword appears once, naturally, in product-image alt text — never repeated, never stuffed.
• File names: descriptive and hyphenated ("ribbed-knit-beanie-charcoal.jpg"), not camera defaults.
• Uniqueness: no two images on a page share identical alt text. If you have four angles of one mug, each angle gets its own line ("front view," "handle detail," "in use with coffee").

Contrast that with the baseline most of the web sits at. Remember the 63% of sites with missing or inadequate alt text — getting to full, accurate coverage instantly puts your store ahead of nearly two-thirds of the field on this signal. It's rare in marketing to find a lever this cheap with a gap this wide. The same discipline pays off across your whole search footprint, which is why alt text belongs in the same workflow as your keyword research and your long-tail keywords — they all feed the same goal of getting the right shopper to the right page.

Alt text in practice: a quick workflow with free tools

Knowing the rules is one thing; doing it across a full catalog without losing a weekend is another. Here's a lean workflow a first-time founder can actually follow, leaning on free resources to keep momentum:

1. Batch your images by template. Group similar shots — all the "flat lay" photos, all the "on-model" shots — so you can reuse a description pattern and move fast.
2. Anchor each product's keyword first. Before writing alt text, decide the one phrase each product should own. If you're stuck, a tool like the product description generator can surface the natural language buyers use, and that same phrasing flows straight into your alt text.
3. Write the hero image first, then variations. The main product shot gets your fullest description; angle and detail shots get shorter, distinct lines.
4. Cross-check against your brand. Alt text is still copy, so it should match your brand voice where it can — a playful kids' brand and a minimalist skincare line describe the same product differently.
5. Audit before launch. Skim every page once with images "described aloud" in your head, or use a free browser accessibility checker, to catch blanks and file-name leftovers.

While you're tightening up images, it's worth running the rest of your store-launch checklist in the same sitting. The same plain-language clarity that makes good alt text makes good everything: a memorable name from the store name generator, a sharp line from the tagline generator, and the legal basics like a solid return policy and a clear shipping policy. Browse the full free tools library to knock these out fast, and if you're still shaping the idea itself, the getting-started hub walks through the order to tackle them in.

Common mistakes with Alt text

• Leaving it blank on real images. An empty alt on a meaningful product photo is the original sin — it's exactly what the WebAIM Million keeps flagging across the web's biggest sites. Blank means invisible to screen readers and search alike.
• Keyword stuffing. "Candle lavender candle soy candle best candle buy candle" reads as spam to Google and as gibberish to a screen reader. One natural keyword is plenty; accuracy beats repetition every time.
• Using the file name as the description. "IMG_4471.jpg" or "Screenshot-2026" is not alt text. If your builder auto-fills the file name, overwrite it with a real sentence.
• Writing "image of" or "photo of." Screen readers already say "image." Those two words just slow the listener down — cut them and lead with the subject.
• Describing decorative images. Adding alt text to background swirls, borders, and spacer graphics clutters the experience with noise. Decorative-only images should be set to alt="" so assistive tech skips them.
• Forgetting that linked images need destination text. When an image is also a link or button, the alt should say where it goes ("View the candle collection"), not just what it pictures.
• Writing a novel. A 60-word paragraph crammed into alt text gets truncated and exhausts screen-reader users. Keep it to one tight, vivid line and let captions or page copy carry the rest.

How Zentrix helps

When you build a store on Zentrix, technical SEO isn't a separate chore you bolt on later — it ships with the store. Every Zentrix store comes with Product and Breadcrumb JSON-LD on every page, an automatic sitemap.xml and robots.txt, canonical tags, and fast, Lighthouse-100 pages, so the foundation that makes your product images discoverable is already laid. On top of that, Zentrix writes your SEO titles, meta descriptions, and product descriptions for you — the same descriptive, plain-English instinct that powers good alt text — so a first-time founder isn't staring at 96 empty boxes wondering what to type. You go from an idea to a real online store with the brand, the legal policies, the suppliers, and the marketing tools already in place.

That whole-business approach is the point. Strong alt text only earns its keep when it sits on a fast, well-structured, professionally branded store — and that's exactly what Zentrix assembles from a single prompt, including the brand voice, brand colors, and product copy that make your images worth describing in the first place. If you want to see your idea become a store that's readable by shoppers, search engines, and AI assistants alike, start building your store on Zentrix and explore the full feature set or see what's included on pricing while you're at it.

Frequently asked questions

How long should alt text be?

Aim for roughly 8 to 16 words, or under about 125 characters. That's long enough to describe the image clearly and short enough that screen readers won't truncate it or tire the listener out. If you find yourself writing a paragraph, move the extra detail into a visible caption or your page copy instead.

Does alt text actually help my SEO?

Yes, for image search specifically. Google has confirmed alt text is a ranking signal in Google Images, where it uses your description along with computer vision and page content to understand the photo. It's not a separate ranking factor for normal web search, but with conversion-rate optimization and visual search both growing in importance, descriptive alt text is a low-cost way to get found.

What should alt text be for decorative images?

Set it to empty — alt="" — so screen readers skip the image entirely. Decorative elements like background patterns, dividers, and spacer graphics carry no information, so describing them only adds noise. The empty alt attribute is intentional and correct; it's different from leaving alt off completely.

Is alt text the same as a caption?

No. Alt text lives in the image code and is read by screen readers and search engines, usually unseen by sighted visitors. A caption is visible text printed near the image for everyone to read. They complement each other — a caption adds context and personality, while alt text ensures the image is accessible and discoverable. Use both where it helps.

Do I need alt text to comply with accessibility law?

Effectively, yes. Missing alt text on meaningful images is one of the most common complaints in ADA website accessibility lawsuits, which heavily target e-commerce stores. Writing accurate alt text on every informative image is one of the simplest, cheapest steps toward an accessible, defensible store — though full compliance involves more than images alone.

Will Zentrix write alt text for my product images?

Zentrix builds your store with technical SEO baked in — JSON-LD, sitemaps, canonical tags, fast pages — and writes your SEO titles, meta descriptions, and product descriptions, which lean on the same descriptive approach good alt text uses. The best move is to review the image descriptions on your key product photos so each one accurately reflects what's in the frame. You can spin up your store and refine from there.