AI Alt Text Generator
Upload an image and get accessible, SEO-ready alt text in seconds. Free, no login.
What this alt text generator does
Upload a photo, screenshot, chart, or product shot and the AI describes what is actually in it — then writes that description the way alt text should be written: short, literal, and free of filler. You get five options so you can pick the one that fits the surrounding context, because the right alt text depends on why the image is on the page.
Nothing is stored. The image is resized in your browser, sent to the model for a single request, and discarded.
What good alt text looks like
- Keep it under 125 characters: most screen readers truncate past that point
- Skip "image of" and "photo of": the screen reader already says it is an image
- Describe function, not just appearance: for a button or icon, say what it does
- Leave decorative images empty:
alt=""tells assistive tech to skip them - Do not keyword-stuff: Google treats stuffed alt attributes as spam, and it makes the page worse for the people alt text exists for
- Include text that appears in the image: if a chart or screenshot contains words, they belong in the description
Why alt text matters
- Accessibility: WCAG 1.1.1 requires a text alternative for non-decorative images. It is the single most common accessibility failure on the web.
- Image SEO: alt text is how Google Images understands a picture, which is how you show up in image search.
- Broken images: when a file fails to load, the alt text is what the visitor sees instead.
- Legal exposure: accessibility lawsuits routinely cite missing alt attributes on e-commerce catalogs.
- Context for AI: answer engines reading your page use alt text to interpret the images in it.
How to use it
- Upload the image, or drag it straight onto the box
- Leave the tone on Alt Text — it is already selected on this page
- Add context in the Additional Info box if the image needs it (product name, chart subject, location)
- Pick your output language — alt text should match the language of the page it sits on
- Generate, then copy the option that fits and paste it into your
altattribute
Frequently asked questions
What is alt text?
Alt text (alternative text) is a written description of an image in the HTML alt attribute. Screen readers read it aloud to people who cannot see the image, and search engines use it to understand what the image shows.
How long should alt text be?
Aim for under 125 characters. Most screen readers cut off around that length, and a single clear sentence is easier to listen to than a paragraph.
Should alt text start with "image of"?
No. Screen readers already announce that the element is an image, so "image of" or "picture of" wastes the listener's time. Describe the content directly.
Is this alt text generator free?
Yes. You can generate alt text for several images without an account. There is a fair-use limit per visitor; RightBlogger removes it if you need unlimited runs.
Do decorative images need alt text?
No. Purely decorative images — dividers, background flourishes, spacers — should use an empty alt attribute (alt="") so screen readers skip them.
Doing this at scale
Writing alt text one image at a time is fine for a landing page and painful for a 400-product catalog or an archive of old blog posts. If you need volume, RightBlogger runs the same kind of generation without the per-visitor limit, alongside 80+ other content and SEO tools.
Need captions instead of alt text? Use the image caption generator, or the Instagram caption generator for social posts.