You spend hours getting a product photo exactly right, upload it, and move on. Meanwhile the file is still named IMG_4821.jpg, and the alt text field is either empty or filled with something generic like “product image.” Neither of those things affects how the photo looks to a customer, but both quietly affect whether that photo, and the listing it’s attached to, gets found at all.

What Alt Text Actually Does

Alt text, short for alternative text, is a written description attached to an image in a page’s code. It exists for two main reasons. First, it’s read aloud by screen readers for visually impaired shoppers (hearing loss greater than 35 decibels (dB) in the better hearing ear, according to WHO). This means well written alt text directly affects whether your store is genuinely usable by that audience, not just a checkbox for compliance. Second, search engines can’t see an image the way a person can, so alt text is one of the main ways search engines understand what an image actually shows, which affects whether it can appear in image search results at all.

Good alt text is specific and accurate, not stuffed with keywords. “Navy blue merino wool sweater, front view” is useful alt text. “Sweater blue sweater navy sweater buy sweater online” is not, and search engines are generally good at recognizing and discounting that kind of keyword stuffing anyway.

What File Names Actually Do

File names are a smaller but still meaningful signal. A file named navy-merino-wool-sweater-front.jpg gives search engines and image search results a relevant clue about the image content before the page even loads. A file named IMG_4821.jpg or 20260714_103522.jpg gives them nothing useful at all.

This matters more than it seems, particularly for image based discovery. A meaningful share of product research starts in image search results rather than standard text search, and both alt text and file names are among the clearest signals available for how an image gets categorized and surfaced there.

How to Actually Do This Without It Becoming a Chore

Rename files before uploading, not after. Batch renaming a folder of product photos with a clear naming pattern, like product name, color, and angle, takes a few minutes and avoids the much slower process of fixing file names one by one after they’re already live on a site.

Write alt text the way you’d describe the photo to someone who can’t see it. Include the product, the color, the material if relevant, and the angle or context (front view, worn on model, close up of detail), without turning it into a keyword list.

Keep it specific to what’s actually in that image. If a listing has six photos, each one should have alt text describing that specific photo, not the same generic description copied across all six.

Don’t skip it because it’s invisible to most shoppers. It’s easy to treat alt text as something that only matters for accessibility compliance, but for a shopper using a screen reader, this text is the entire experience of that image. Treating it as an afterthought means treating part of your customer base as an afterthought.

Also read: Product Photography for Amazon: A Guide to Selling More

Frequently Asked Questions About Alt Text and File Names:

1. What is alt text used for?

Alt text describes an image for screen readers used by visually impaired shoppers, and it also helps search engines understand and index the content of an image, which affects whether it can appear in image search results.

2. Does file naming actually affect SEO?

Yes, though it’s a smaller factor than alt text. Descriptive file names give search engines an additional, earlier signal about what an image contains, which can influence how it’s categorized and surfaced in image search.

3. Should alt text include keywords?

Alt text should be an accurate, specific description of the image, which naturally tends to include relevant terms. Deliberately stuffing alt text with repeated keywords rather than a genuine description tends to be recognized and discounted rather than rewarded.

4. How long should alt text be?

There’s no strict rule, but a concise, specific sentence describing the product, color, and angle is generally more useful than either a single vague word or an overly long paragraph.