ALT text is a short description you add to every image on your store. When an image fails to load, visitors see this text instead. Screen readers also read it aloud for visually impaired users — and search engines use it to understand what your image is about.
You already know alt text matters for rankings and AI search visibility. Now you're ready to fix it.
But before you fill in a single field — the mistakes merchants make at this exact stage are enough to undo every gain you're chasing.
You already know image optimization is one of the factors that helps your Shopify store rank higher — and increasingly, get cited by AI search engines like Google's AI Overviews and Bing Copilot. You've done the research. Alt text is on your list.
But here's where most Shopify merchants lose the gains they should be getting: the execution.
Adding alt text feels straightforward until you realize there are specific ways to do it that actively hurt your rankings — and they're easy to stumble into right at the start. Before you touch another image field, read this first.
Mistake #1: Leaving Alt Text Blank
Shopify does not auto-generate alt text when you upload images. Every field starts empty, and nothing reminds you to fill it in.
When Lighthouse flags "Image elements do not have [alt] attributes," this is what it's seeing. According to Google's image SEO guidelines, alt text is a primary signal Google uses to understand and index your images. Blank means invisible — to Google Image Search, to AI engines parsing your page, to screen readers.
The fix: In Shopify, go to your product page → click any image → fill in the alt text field. Every product image, collection image, and blog image needs one — no exceptions. For large catalogs, use a bulk-fix tool (see the tools section below).
Mistake #2: Using the File Name as Alt Text
When products are imported via CSV or third-party apps, Shopify sometimes auto-pulls the file name into the alt text field.
But alt text reading DSC_00493.jpg or product-image-1 is not optimization — it's noise. Google confirms that file names and alt text both contribute to image understanding, but neither substitutes for the other.
The fix: Rename image files descriptively before uploading — womens-navy-suede-ankle-boots.jpg. After any bulk import, audit your alt text fields immediately to catch anything auto-populated with file name strings.
Mistake #3: Writing Alt Text That's Too Generic
"product image". "photo". "blue shoes". Technically present, practically useless. Generic alt text gives Google no keyword signal and fails the users who depend on screen readers to understand your content — a group WebAIM's survey consistently identifies as underserved by ecommerce stores.
The fix: Use this formula — [Descriptive detail] + [Product name or keyword] + [Context if relevant]
| ❌ Too Generic | ✅ Optimized |
|---|---|
| "blue shoes" | "women's navy suede ankle boots with block heel" |
| "shirt photo" | "men's slim fit white linen shirt with button collar" |
| "bag image" | "brown leather crossbody bag with gold chain strap" |
Imagine writing it for a blind person first. If it's descriptive enough for them, it's descriptive enough for Google.
Mistake #4: Keyword Stuffing Alt Text
If you go from blank fields to cramming every possible keyword variation into a single image description: "red dress buy red dress cheap red dress online free shipping women."
That's not SEO — it's a spam signal.
The fix: One primary keyword per image, used naturally inside a descriptive phrase. If the keyword fits the description organically, it belongs. If you're forcing it, cut it.
Mistake #5: Copy-Pasting the Same Alt Text Across Variant Images
A product with 6 color variants gets the same alt text on every image: "classic cotton t-shirt". Efficient to write. Damaging rankings.
Identical alt text across variant images creates duplicate signals across your image index. Google can't distinguish your red variant from your navy one, so they compete against each other instead of each owning their own search territory.
The fix: Differentiate by whatever makes each image visually distinct.
| Image | Alt Text |
|---|---|
| Flat lay, red | "classic cotton t-shirt in red flat lay" |
| Flat lay, navy | "classic cotton t-shirt in navy flat lay" |
| Lifestyle shot, red | "woman wearing red classic cotton t-shirt outdoors" |
Mistake #6: Writing Alt Text That's Too Long
AI tools without character limits and over-thorough merchants produce the same result: alt text that reads like a product description. Therefore, the keyword you actually want indexed may be buried past the cut-off point.
The fix: Target 50–125 characters — roughly 8 to 15 words. Lead with the most important detail. If you're generating alt text with AI in bulk, always set a hard character limit in your prompt.
Mistake #7: Adding Keyword Alt Text to Decorative Images
Background textures, divider lines, and decorative theme elements should have a different type of alt text, which is alt="" This signals Google to skip these images, avoiding diluting the signal strength of your actual product images
The fix:
- Content images (products, banners, blog images) → descriptive alt text, always
- Decorative images (backgrounds, dividers, theme styling elements) → alt="", deliberately
While you're at it: check your Shopify theme's default image markup. Some themes incorrectly leave alt attributes missing entirely on content images — flag this with your developer or theme support.
Quick Reference: Alt Text by Image Type {#formula}
| Image Type | Formula | Example |
|---|---|---|
| Product image | Product name + descriptor + variant | "women's wool camel coat double-breasted in beige" |
| Lifestyle shot | Context + product + setting | "woman wearing camel wool coat on city street" |
| Collection banner | Category keyword + intent | "shop women's winter coats collection" |
| Blog image | Topic keyword + context | "Shopify alt text audit in Google Lighthouse" |
| Decorative | Empty, intentional | alt="" |
Best Free Tools to Find and Fix Alt Text Issues {#tools}
Audit First — Find Every Problem
Google Lighthouse — Already in your browser. Open Chrome DevTools → Lighthouse → run an SEO or Accessibility audit. Flags every image missing alt text with a direct element reference. Runs one page at a time.
Screaming Frog SEO Spider (free up to 500 URLs) — Crawls your entire Shopify store and exports every image with missing or thin alt text in one report. The most complete free audit available for stores under 500 pages.
WAVE Accessibility Tool (free browser extension) — Visually highlights every problematic image directly on your live page. Best for quick page-level checks.
Google Search Console (free) — Doesn't flag alt text directly but surfaces image indexing gaps under Coverage reports — a downstream signal that your image optimization isn't working. Access here.
Then Fix — Especially at Scale
Shopify's native editor — Products → select product → click image → edit alt text. Reliable for stores with small catalogs. Completely unscalable beyond 50 products.
Shopify Bulk Editor — Handles product fields in bulk but does not include image alt text fields natively. Not useful here.
SEO apps on the Shopify App Store — The practical solution for any store with a real catalog. Look for apps that run a store-wide alt text audit, support bulk editing across products, collections, and blog images, and offer AI-generated suggestions based on your existing product data — without requiring CSV exports or manual re-imports.
Start Clean, Stay Consistent
Take the time to audit before you write. Once done correctly, every image in your store becomes a legitimate ranking asset — one Google can index, understand, and surface to the customers already searching for what you sell.
Drop your experience in the comments — what worked, what didn't. Also, get in touch now to discuss further and get expert help from Tapita.