Free Alt Text Generator for Accessible Images
Upload an image and get screen reader friendly alt text in seconds. Free AI, nothing to install, and no login needed.
Alt text is generated automatically as soon as your image finishes uploading.
How to generate alt text for an image
Upload the image you need alt text for.
Let the AI draft a short description.
Edit the text so it fits the page or post.
Copy it into your CMS or scheduler.
How to write alt text that actually works
What to include, what to leave out, and when an image needs no alt text at all.
Describe the point, not the pixels
Good alt text tells a screen reader user what the image contributes to the page: the subject, the action, and any context that matters. Skip openers like "image of" or "photo of", because screen readers already announce that an image is present, so those words waste the listener's time. Around 125 characters is a common convention, since some screen readers pause or cut off longer strings, which makes brevity a feature rather than a limitation.
Alt text is an image SEO signal too
Search engines cannot see your images, they read the alt attribute to understand them. Accurate, specific alt text helps your visuals surface in image search and reinforces what the surrounding page is about. Write for the human first and the crawler second: naturally worded descriptions that happen to mention the topic will always beat a string of stuffed keywords, which can actively hurt rankings.
Decorative images are the exception
A divider graphic or background texture adds nothing for someone using a screen reader, so it should carry an empty alt attribute rather than a forced description. Informative images deserve the opposite treatment, and complex ones like charts may need a fuller writeup, which is where an Image Description Generator gives you a longer starting point. If the image is headed for social, Pallyy also lets you add alt text to scheduled social media posts so accessibility does not stop at your website.
Questions, answered
What should good alt text include?
The meaningful subject of the image, what is happening, and any context a sighted visitor would pick up at a glance. Leave out redundant phrases like "image of", and skip details that do not change how someone understands the page.
How long should alt text be?
Aim for one concise sentence, roughly 125 characters, since some screen readers pause or truncate around that point. If an image genuinely needs more explanation, put the detail in the surrounding text or a long description instead.
Does alt text help SEO?
Yes. Search engines rely on the alt attribute to understand images, so descriptive alt text can help your visuals appear in image search and adds relevance to the page. Keyword stuffing has the opposite effect, so keep it natural.
What about purely decorative images?
Decorative flourishes, dividers, and background textures should have an empty alt attribute so screen readers skip past them. Reserving descriptions for images that carry meaning makes the whole page faster to listen to.
Which image formats can I upload?
Standard web formats such as JPG, PNG, and WebP all work. Sharper, well-lit images give the AI more to go on, which shows up as a more precise description.
Can I change the alt text before using it?
You should. The AI produces a solid draft from the image alone, but it cannot know the page context, so a quick edit to align the wording with your content is usually worth the extra minute.
Why is this tool free?
Pallyy builds free tools like this one so marketers can try our AI before ever considering the scheduling platform. Your upload is used only to generate the alt text, and there is nothing to sign up for.
