AI Alt Text: Write Accurate Alt Text for Your Product Images
AI alt text tools can describe hundreds of product images in the time it takes to write a few by hand. That makes them useful for stores with large catalogs and missing descriptions. However, AI sees only the image, not why it’s on the page, and it sometimes gets details wrong, so its output works best as a draft that a person reviews before publishing.
Used that way, AI can close an accessibility gap quickly without filling your store with inaccurate or generic descriptions. The difference comes down to what you tell the tool and how carefully you check what it returns.
Should You Use AI for Alt Text?
Yes, for drafting, as long as someone reviews the results. AI is fast and consistent, which helps most when a catalog has thousands of images without alt text. Its weaknesses are context and accuracy: it describes what an image shows, not what a shopper needs to know, and it can misidentify colors, materials or objects.
Accuracy matters more than speed here. Alt text is what screen reader users hear in place of an image, and an incorrect description can be worse than none because it gives them false information. Adding AI text just to fill empty fields doesn’t make a site accessible on its own either.
| AI alt text works well for | Take more care with |
|---|---|
| First drafts across a large catalog | Size charts, diagrams and other complex images |
| Keeping phrasing consistent across many images | Images that contain important text |
| Simple product photos on plain backgrounds | Products with regulated or technical claims |
| Finding images that still have no alt text | Images that act as links or buttons |
For complex images, a short alt text plus a fuller description in the page text usually works better than a long alt attribute. For images that act as links, the alt text should describe where the link goes, such as “Home,” rather than what the icon looks like.
How to Create Accurate AI Alt Text for Product Images
A reliable workflow has five steps: choose which images need descriptions, give the AI product context, set clear rules, review every result and then add the approved text to your store. Skipping the context and review steps is where most poor AI alt text comes from.
1. Decide which images need alt text
Every image that conveys information needs a description, and product photos almost always do. They show shoppers the color, shape, material and details they’re deciding on.
Purely decorative images are different. Background patterns or spacer graphics should have empty alt text (alt="") so screen readers skip them, and AI tools don’t make that judgment for you. Separate decorative images out before you generate descriptions in bulk.
2. Give the AI product context
An AI tool looking at a photo of a bag doesn’t know it’s your “Harbor Tote” in navy waxed canvas. Generic input produces generic output, such as “a blue bag on a white background,” which tells a shopper very little.
Include product details in your prompt or tool settings so the description matches what you sell. For example, a prompt for one image might read:
Write alt text under 125 characters for this product photo. Product: Harbor Tote. Color: navy. Material: waxed canvas with leather handles. View: front. Describe what a shopper needs to know. Don’t start with “image of.”
If you’re generating text for many images, pull these details from your product data, such as title, color option and material, rather than typing them each time. That keeps descriptions tied to the right variant and avoids mismatches between the photo and the listing.
3. Set clear rules for length and wording
Consistent rules make AI output easier to review. Most guidance recommends keeping alt text concise, around 125 characters or fewer. Shopify allows up to 512 characters in its image alt text field, but recommends 125 or fewer.
A few wording rules improve almost every description:
- Skip “image of” or “photo of.” Screen readers already announce that it’s an image.
- Lead with what matters. Name the product and its most important visible details first.
- Avoid keyword stuffing. Write for people. A clear, accurate description serves both accessibility and search better than a list of keywords.
- Describe only what’s visible. Leave out claims the image doesn’t show, such as “waterproof” or “best-selling.”
4. Review every description
Review is the step that turns AI drafts into reliable alt text. Check each description against the image and the product listing, paying particular attention to color, material, quantity and anything shown in a lifestyle photo.
| Typical AI draft | Problem | Reviewed version |
|---|---|---|
| A blue bag on a white background | Generic, no product details | Navy waxed canvas tote with brown leather handles, front view |
| Image of a woman wearing a black dress at a party | Starts with “image of” and focuses on the setting | Black midi wrap dress with three-quarter sleeves, worn by a model |
| Three white mugs on a wooden table | Wrong count; the set includes four | Set of four white stoneware mugs with matte finish |
Also watch for unnecessary descriptions of people’s appearance and for wording that reflects stereotypes. When a model appears in a photo, the product is usually what the shopper needs described.
For large catalogs, review in batches by product type. Patterns show up quickly, such as a tool that consistently mislabels navy as black, and you can fix the prompt instead of correcting each description one by one.
5. Add the approved alt text to your store
Once descriptions are approved, add them in bulk rather than pasting them into each product page. In Shopify’s product CSV, alt text goes in the Image alt text column, on the same row as the image’s Product image URL.
Because those rows also contain image links, test any alt text update on a few products first and keep a backup export. Updates that include image columns can affect the images themselves, so check the live product pages before importing the full file.
If you manage this kind of update regularly, Bulkflow supports updating existing records from a spreadsheet with field mapping for Shopify. That lets you keep approved alt text in a spreadsheet alongside your other product data and send it to your store in bulk.
Privacy and Cost Considerations
Generating alt text usually means sending your images to an AI service. For product photos that are already public, that’s rarely a concern, but check the provider’s data terms before uploading unreleased products or images containing people.
Costs depend on the approach. Dedicated alt text tools typically charge by image volume, while general AI services charge by usage, and image analysis can add up across a large catalog. Some tools can also run with locally hosted AI models, which keeps images on your own systems at the cost of more technical setup.
Conclusion
AI alt text is a practical way to describe a large catalog quickly, as long as it starts with good product context and ends with human review. With clear rules and a careful check of each description, you get alt text that helps shoppers who rely on screen readers and keeps your listings accurate. We hope this guide helps you use AI alt text with confidence. If you manage product data in bulk, you can explore Bulkflow.
