Image Alt Text Generator Online

What is image alt text?

Alt text, short for alternative text, is a written description that lives inside an image tag in your HTML. It looks like this:

<img src="red-running-shoes.jpg" alt="Red running shoes with untied laces on a wooden gym floor">

Nobody sees that sentence while the page is working normally. It does its job in three situations. A screen reader reads it aloud to someone who cannot see the picture. A browser displays it when the image fails to load, which still happens on slow connections and broken links. And a search engine reads it to work out what the image shows, because software understands a sentence far more reliably than it understands pixels.

That makes alt text one of the few pieces of writing on a page that serves accessibility, resilience and search at the same time. It is also one of the most neglected. Most sites have images with no alt attribute at all, or with a camera file name sitting where a description should be.

This image alt text generator online takes the awkward part out of the job. You type a few words about what the image shows, pick the type of image, and the tool shapes that into alt text that reads well out loud, strips the filler people habitually add, keeps the length inside the limit screen readers work with, and hands you the finished img tag ready to paste.

Why alt text matters more than people think

Accessibility comes first

Millions of people browse with screen readers. When they reach an image with no alt attribute, the software often reads the file name instead, so the visitor hears something like "D-S-C underscore zero four eight two one dot jay peg". An image with empty alt is skipped silently, which is correct for decoration. An image with a real description tells them what everyone else can see. That is the whole point of the attribute, and the rest follows from it.

It is a legal requirement in many places

Accessibility standards such as WCAG require text alternatives for non-text content, and those standards are written into law for public sector and many commercial sites across the US, the UK, the EU, Canada and elsewhere. Missing alt text is one of the most common failures found in accessibility audits, and one of the cheapest to fix.

It helps search engines understand your page

Google has said plainly that alt text helps it understand images, and that it uses the text for Google Images ranking. Images that appear in image search, product listings and rich results tend to be ones described clearly. Alt text also adds context to the surrounding page content, which matters when an image carries information that the text does not repeat.

It saves you when images break

Content delivery networks fail, files get renamed, data-saver modes block images. A page whose images are described still makes sense. A page of empty grey boxes does not.

How to use the BlogDada alt text generator

1. Add your image, or skip it. Dropping an image in is optional. When you do, the tool reads its file name and dimensions from your device to prefill the img tag with src, width and height, and turns a descriptive file name into starting words.
2. Describe the subject. A few words are enough: "red running shoes", "woman presenting to a small team", "quarterly revenue bar chart". Leave out "image of" — the tool removes it anyway.
3. Add a detail worth hearing. What is happening, where it is, or the one feature that matters. This is what turns a generic label into a useful description.
4. Pick the image type. A product image, a screenshot, a chart and a logo each follow a different convention, and the tool applies the right one. Choosing Decorative only gives you the empty alt attribute instead, which is the correct answer for images that carry no information.
5. Add your page keyword if it fits. The tool offers a version with the keyword included and warns you when it would not read naturally.
6. Pick a version and copy. You get a short option, a fuller descriptive option and a keyword option, each with a live character count, plus the complete img tag underneath.

The second tab reviews alt text you already have. Paste a list, or paste whole img tags copied from your source code, and each line comes back with the specific problems flagged: too long, starts with filler, reads like a file name, repeats a keyword, shouts in capitals, or is simply empty when it should not be.

Seven rules for writing good alt text

• Describe the purpose, not just the contents. Ask why the image is on the page. A photo of a chef on a recipe page might need "Chef folding dough for croissants", not "man in a kitchen".
• Be specific but brief. One clear sentence beats a paragraph. Under 125 characters is the practical target, because several screen readers truncate around there.
• Skip "image of" and "picture of". The screen reader already announced that it is an image. Those words are pure overhead.
• Use plain, natural language. Write what you would say to a friend on the phone who asked what the picture shows.
• Include text that appears inside the image. If a banner or screenshot contains words, those words carry meaning and must reach someone who cannot see them.
• Do not repeat the caption. If a caption already describes the image and is read aloud, a matching alt text means hearing it twice. Add something the caption leaves out, or use an empty alt.
• Leave decoration silent. Dividers, background textures and spacing images get alt="" so screen readers pass over them.

Good and bad alt text examples

Notice the pattern in the right-hand column. Each one answers the question a sighted visitor gets answered instantly by glancing at the image, and stops there.

Alt text for different image types

Product images

Name the product and the attributes a buyer would care about: colour, material, size, angle. If you have five photos of one product, describe what is different in each, such as the front view, the sole, the inside lining. Repeating the same alt text five times helps nobody.

Charts, graphs and infographics

Summarise the finding, not the format. "Bar chart showing revenue rising from $4M to $7M between 2023 and 2026" carries the point. For a complex chart, keep alt text short and put the full data in a table or a paragraph near the image, where everyone can use it.

Screenshots

Say what the screen shows and which part matters. Include any on-screen text a reader needs. "Settings page with the Enable two-factor authentication toggle switched on" is far more useful than "screenshot of settings".

Logos and icons

For a logo that links to the homepage, describe the destination rather than the artwork: "BlogDada home". For an icon button, describe the action: "Search". If the icon sits next to a text label that already says the same thing, use an empty alt so it is not announced twice.

Photos of people

Name the person if their identity is relevant, and say what they are doing. Avoid guessing at age, ethnicity or anything else you cannot know, unless it is genuinely the point of the image.

Decorative images and CSS backgrounds

Use alt="", not a missing attribute. The two behave differently: an empty value tells assistive software to skip the image deliberately, while no attribute at all leaves it guessing, often falling back to the file name. Images added through CSS backgrounds are already ignored, which is one reason purely decorative artwork belongs in CSS.

Using keywords without stuffing

Alt text is a legitimate place for a keyword, as long as the keyword describes the image. If your article targets "best running shoes" and the photo is of running shoes, "Red running shoes lined up on a store shelf" is accurate and contains the phrase naturally. That is all the optimisation the attribute needs.

Stuffing looks different: a comma-separated list of phrases, the same keyword on every image on the page, or a description that mentions a product the image does not show. Search engines have treated this as spam for years, and more importantly it makes the page worse for the people alt text exists to serve, because they hear a list of marketing terms instead of a description.

A simple test: read your alt text aloud. If it sounds like a sentence, you are fine. If it sounds like a meta keywords tag from 2005, rewrite it. The checker tab flags repeated phrases and comma-heavy lines for exactly this reason.

Alt text vs title, caption and file name

A tidy file name is a small win that costs nothing at upload time. It also gives this tool something to work with when you drop an image in.

Adding alt text in WordPress, Shopify and other platforms

• WordPress. Open Media Library, select the image and fill the Alternative Text field, or use the Alt text box in the block settings sidebar of the block editor. The Media Library value applies wherever the image is inserted afterwards.
• Shopify. In Products, click a product image and choose Edit alt text. Theme images such as banners usually have their own alt field in the theme editor.
• Wix and Squarespace. Both put alt text in the image settings panel, labelled "What's in the image?" on Wix and "Alt text" under image design on Squarespace.
• Hand-coded HTML. Paste the complete tag from this tool, which already includes width, height and loading="lazy". Dimensions prevent layout shift, and lazy loading keeps images below the fold from slowing the first paint.

Finding images with missing alt text on your site

Before writing anything new, it helps to know how bad the gap is. Three quick ways:

• Crawl the site. Any SEO crawler reports images with missing or empty alt attributes across every page in one pass, which is the fastest option for a site of any size.
• Use a browser accessibility checker. Free extensions built on the axe or WAVE engines highlight problem images directly on the page, including alt text that duplicates a nearby caption.
• Run Lighthouse. Chrome's built-in audit flags images without alt attributes in its accessibility score, which is handy for spot checks on key templates.

Then work in order of value: pages that get traffic first, product images next, archive posts last. Paste each batch into the checker tab here, fix what it flags, and move on. Most sites can clear their worst image accessibility problems in an afternoon.

Frequently asked questions

Write alt text for your next image

Good alt text takes about fifteen seconds per image once you know the shape of it: subject, the detail that matters, stop. Use the generator above for the images you are publishing today, then paste your existing alt text into the checker and clean up what is already live. Your readers who rely on screen readers will notice, and Google Images will too.