Free Tool
Write clear, accessible image descriptions for social media and web images. Answer the subject, action, setting, and detail prompts, then copy the result into the alt text field.
Fill in the prompts to generate alt text...
Quick Rules
Screen reader users hit a post with no description, hear silence, and scroll on. Search engines and newer AI search surfaces get less context from an image they cannot read, so a clear sentence gives both people and crawlers something useful to work with.
This free image alt text generator walks through the four pieces that actually matter: the subject, what is happening, where it is, and the detail or mood that made the image worth posting. Fill in what applies, copy the sentence, and paste it into the alt field on Instagram, LinkedIn, Facebook, Pinterest, X, or your CMS.
Answer the prompts. The image description generator stitches the subject, action, setting, and detail line into one clean sentence that reads the way a person would describe the photo out loud. Since you supply the facts, the result stays grounded in what the image really shows.
Most screen readers cut alt text around 125 characters, so the counter turns red once you cross that line. Trim the wording until the most important detail lands inside the limit.
Instagram, LinkedIn, Facebook, X, Pinterest, and most CMS image blocks all expose an alt text field on the image itself. Use it every time, not only on the launch posts.
Every major social platform now exposes an alt text field somewhere in the upload flow, and the rule for alt text on social media is the same everywhere: write a sentence that tells a person who can't see the image what is in it. The field name changes a little, and the limits vary, but the writing job does not.
Tap Advanced Settings before posting and edit the Accessibility line. Instagram autogenerates a generic one from its own vision model, and pasting in a real description from this Instagram alt text generator almost always does a better job.
LinkedIn shows an Add Alt Text button when you attach an image to a post. It supports a longer field than Instagram, but screen reader behaviour is similar, so keeping the 125-character habit still serves the people relying on it.
Facebook also autogenerates a description and lets you replace it. Edit the alt text on each image before publishing, since the autogenerated version often misses the part of the photo that actually mattered.
Pinterest treats the alt text as part of the pin's accessibility and visual search context. A specific, honest description helps the pin surface for the right searches and reads cleanly to screen reader users at the same time.
X exposes an Add description button while you compose the post. It supports a longer field, but the rule still holds: lead with what matters, stop when you have said it, do not stretch the sentence for the sake of filling space.
On a website the alt attribute on the img tag is what screen readers and search engines read, which is why an alt attribute generator and an alt text generator end up doing the same job. The sentence the tool produces works for a blog post image, a product photo, or a marketing page hero.
Treating alt text as subject, action, setting, detail is a habit that scales. Once you can name what each piece does, swapping a weak description for a stronger one stops being guesswork.
Who or what the image is of. 'A golden retriever' beats 'a dog'. Specific nouns help screen reader users picture the image quickly and help search engines understand what the page is really about.
What the subject is doing or how it is. A still product shot still has a state, like 'sitting on a marble countertop'. Without this line the description sounds like a label rather than a description.
Where the image is. A studio, a kitchen, a sunset, a city street, a window-lit desk. Setting is what separates a generic stock-image description from one that sounds like your actual photo.
The one thing that made the image worth posting. A colour, a texture, a small detail in the frame, the feeling it carries. This line is optional, and it is the line that makes the alt text feel written rather than auto-described.
If the image supports a product, post, or article keyword, include that wording only when it honestly describes the image. A product photo can mention the product name; a generic office photo should not be stuffed with the page keyword.
If the image is a button, icon, chart, or screenshot, describe what it does rather than how it looks. Accessibility alt text for a Buy Now button is 'Buy Now', not 'orange rectangle with white text'.
If the image is only a divider, background pattern, or visual flourish, leave the alt attribute empty with alt="" so screen readers skip it. Empty alt is better than forcing a description where no information exists.
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Read the practical guide to writing accessible image descriptions for social media and web images.
Resize the image to the right dimensions for the platform before writing its description.
Write the caption that goes alongside the image once the alt text is set.
Pressure-test captions, bios, and alt text against the limits each platform actually enforces.
Pair an accessible image with a tighter hashtag list instead of stuffing them into the alt field.
See how the image fits the feed before locking in the alt text for it.
Format captions with line breaks that hold when you paste them in.
Plan posts with the alt text, caption, and image lined up in one workflow.
Alt text, short for alternative text, is a short sentence written into the alt field on an image. Screen readers read it out loud to describe the image to people with low or no vision, and search engines use it to understand what the image shows on the page it sits on.
Close enough that the search terms get used interchangeably. Strictly, 'alt' is an attribute on the img HTML tag rather than a tag of its own, but most people typing 'alt tag generator' into Google are after the same thing this alt text generator produces.
Aim for under 125 characters when you can. Shorter descriptions are easier to listen to, easier to scan in a CMS, and less likely to be cut short by a platform or screen reader. The character counter inside the tool turns red once you go over.
Specific nouns, a real action or state, and a setting that sounds like your image rather than any image. 'A photo of a dog' tells a screen reader user almost nothing, while 'a golden retriever sitting on a beach at sunset' tells them what you actually posted. Don't start with 'image of' or 'photo of' since screen readers already announce the element as an image.
Yes. Search engines use alt text, surrounding copy, and the page context to understand what an image shows. A clear description can help the image appear for the right searches, especially when the wording is specific and the keyword only appears where it naturally fits.
It is a guided alternative text generator. You provide the visual facts from the image, and the tool turns them into a clean sentence with a live character count. That keeps the result accurate for product photos, screenshots, charts, and social images where small details matter.
No. If an image is purely decorative, like a divider, background pattern, or visual flourish, use an empty alt attribute, alt="", so screen readers skip it. Save written alt text for images that carry real information.
Yes. Instagram, LinkedIn, Facebook, X, and Pinterest each expose an alt text field on the image during upload, and most CMS image blocks expose the alt attribute on the img tag. The sentence the generator produces drops into any of them.
No. The tool runs free in the browser. Describe your image with the prompts, copy the result, paste it into the alt field. No sign-up, no usage limit, nothing to install.