Free AI Alt Text Generator
Free alt text, no signup
A free AI alt text generator turns a plain description of your image into concise, screen-reader-friendly alt text in seconds, without creating an account. You tell Marisol what the image shows, where it is used on the page, and an optional target keyword, and she writes alt text that fits under 125 characters, describes the subject accurately, skips the 'image of' opener that screen readers already announce, and slots in the keyword only when the image genuinely represents it. She handles batches from a numbered list, calls out when an image should get an empty alt because it is purely decorative, and refines on request: more descriptive, shorter, for a product page, for a blog hero, add the brand. One honest note: in this free chat she works from your description of the image in words, not from the image file itself, so the alt text is only as accurate as what you describe. There is no signup and no credit card to start, and when you want more than writing individual alt strings, the same specialist can become a full AI employee that audits your live site and keeps your image SEO and accessibility current.
alt-text-generator, seo-images, accessibility-a11y, no-signup, free-content-tool
How it works
- Describe your image: What it shows, where it sits on the page, and an optional target keyword. One line is enough to start.
- Get copy-ready alt text: A concise, accurate string under 125 characters in a code block, with a short note on the keyword, character count, or any assumption made.
- Refine or send a batch: Ask for shorter, more descriptive, a specific keyword, or paste a numbered list and get alt text for every image at once.
Why alt text matters for SEO and accessibility
WCAG alt text is a core Web Content Accessibility Guidelines requirement, missing it makes your images invisible to screen readers and fails accessibility audits
125 characters is the soft cap for alt text before screen readers clip or pause, concise and accurate beats long and keyword-stuffed every time
$0 to write as many alt text strings as you want, for any image type, with no signup and no credit card
Seconds from a description of your image to copy-ready alt text optimized for both search engines and screen readers
How the ways to write alt text compare
| Option | No signup | SEO + a11y quality | Cost | Speed |
|---|---|---|---|---|
| Leaving alt text blank | n/a | Fails accessibility audits | Free | No effort |
| Using the filename as alt text | n/a | Rarely accurate or useful | Free | Instant |
| Hiring an SEO or a11y specialist | n/a | High | Expensive | Days |
| This free AI generator | Yes | Concise, accurate, keyword-aware | Free | Seconds |
Alt text that serves SEO and screen readers at the same time
Most images on the web have no alt text, a vague filename pasted in, or a string stuffed with keywords that reads nothing like a real description. None of those help a screen reader user understand the image, and none of them help a search engine index it accurately.
This is built to do both at once: describe the image clearly enough that a screen reader user knows what it shows, and include the target keyword once, naturally, when the image genuinely represents it. You get copy-ready alt text in a code block, under 125 characters, in seconds.
Built around the rules that actually matter
Good alt text follows a short, clear set of rules: no 'image of' opener because screen readers already announce it, start with the subject, describe what is actually there, stay under 125 characters, and leave purely decorative images with an empty alt attribute so screen readers skip them.
The generator applies all of those by default. It also handles functional images, where the alt text should describe the link destination or the button action, not just the visual, and flags when a complex image like a chart or infographic needs a visible caption rather than alt text alone.
Honest about how it works
In this free chat, Marisol works from your description of the image in words. She cannot access a URL, scan your site, or read an uploaded image file. That means the alt text is only as accurate as the description you give her. If you leave out the main subject, she will note the assumption she made.
That is a real limit, and it is worth knowing upfront. It is also exactly why the alt text stays truthful: she will not invent colors, faces, or text that you did not describe, because accurate alt text is the entire point.
How it compares to other alt text generators
Most automated alt text tools either spit out a generic caption from image recognition that misses the page context, or just rename the file. Neither approach considers whether the image is decorative, what the surrounding page is about, or what keyword the page is targeting.
This one is context-aware: you describe the image and tell it where it sits and what keyword you want, and it writes the alt accordingly. No signup to start, handles batches, and talks back when you want to refine. Unlike a one-off tool, the same specialist can carry on as a real AI employee once you want your whole image library audited.
From one alt string to a full image SEO workflow
Writing one alt text string is the easy part. Keeping every image on a live site correctly tagged as the site grows, new pages ship, and content is updated is the part most teams quietly let slip, and the part that causes ongoing accessibility audit failures.
Here the specialist who wrote your alt text can stay on. Once you sign up, the same person becomes a full AI employee in your workspace, auditing your site for missing or weak alt text, keeping your image SEO current as you publish, and flagging accessibility gaps before they show up in an audit, so your image content stays accessible and indexed instead of invisible.
The short version
- A free AI alt text generator turns a plain description of your image into concise, accurate, screen-reader-friendly alt text under 125 characters in seconds, with no account and no card to start.
- Good alt text describes what is actually in the image without starting with 'image of', includes a target keyword only when the image genuinely represents it, and leaves purely decorative images with an empty alt attribute.
- This is a text-based tool: describe your image in words and it writes the alt text. It works from your description, so the output is only as accurate as what you share.
- It writes the alt text, not the site audit. When you want every image on a live site scanned and flagged, the same specialist can do that as a full AI employee beyond what a free chat can reach.
What it does
- Concise, accurate alt text under 125 characters from a plain image description, in seconds
- No 'image of' opener, subject-first, screen-reader-friendly by default
- Natural keyword inclusion when the image genuinely represents the target term
- Empty alt attribute for decorative images, with a clear explanation of why
- Functional image support: alt text that describes the link destination or button action
- Batch mode: paste a numbered list of image descriptions and get numbered alt text back
- Refines on command: shorter, more descriptive, a specific keyword, product page framing
- No signup and no credit card to start
Who it is for
- Writing alt text for product images on an e-commerce site with target keywords
- Adding accessible alt text to blog post images and hero photos
- Handling a batch of images at once from a numbered description list
- Correctly marking decorative dividers and background images with empty alt
- A founder or content creator who needs fast, accurate alt text without an accessibility specialist
Good to know
- Works from your description of the image in words, cannot access a URL, scan a live site, or read an uploaded image file in this free chat.
- Alt text accuracy depends on the description you provide. The more detail you share about the subject, page context, and target keyword, the better the output.
- Complex images like charts, diagrams, and infographics usually need a visible caption or a separate long description in addition to short alt text.
- It writes individual alt strings. Auditing all images on a live site for missing or weak alt text is a wider task that goes beyond this free chat.
Questions people ask about alt text
Short, direct answers to the questions people search for most when writing alt text for SEO and accessibility.
How do I write good alt text for an image?
Describe what is actually in the image, starting with the subject, without writing 'image of' or 'photo of' at the start. Keep it under 125 characters, include a target keyword once if the image genuinely represents it, and use an empty alt attribute for purely decorative images. This free generator does all of that from a plain description of your image, in seconds.
Is this alt text generator free?
Yes. You can write as many alt text strings as you want with no signup and no credit card. Because it works from your description rather than a fixed template, you can keep refining: shorter, more descriptive, a different keyword, product page framing. After a number of messages it may ask for your email to save your work and keep going.
What is alt text and why does it matter?
Alt text is the text attribute on an image tag that screen readers read aloud to users who cannot see the image, and that search engines use to understand what the image shows. Missing or vague alt text fails accessibility guidelines like WCAG 2.1 and leaves your images invisible to search engines. Accurate alt text serves both: it describes the image to anyone who cannot see it and helps the page rank for image search terms.
Should I use keywords in alt text?
Only if the image genuinely shows what the keyword describes. Include the keyword once, naturally, within the description. Do not repeat the same keyword across every image on the page, do not add keywords the image does not represent, and do not pad a short description with extra terms. Keyword-stuffed alt text is an accessibility failure and a risk for SEO penalties, not a benefit.
What should decorative images have for alt text?
An empty alt attribute: alt="". This tells screen readers to skip the image entirely because it adds no information to the page. Do not write 'decorative image' as the text, because that still reads out and adds noise. Purely decorative images include dividers, background textures, geometric shapes, and generic stock photos used only for visual filler.
How long should alt text be?
Under 125 characters as a soft cap. Screen readers often clip or pause at that length. A strong alt text is usually one clear sentence: the subject described accurately with any key context. If the image is a complex chart or infographic that cannot be summarized in 125 characters, it usually needs a visible caption or a separate linked long description rather than a longer alt attribute.
What is the difference between alt text and a caption?
Alt text lives in the image tag attribute and is invisible on the page but read by screen readers and crawled by search engines. A caption is visible text below the image that everyone sees. Complex images often need both: a short alt tag for screen readers and a longer visible caption or description for sighted users who want more detail.
Does alt text help with SEO?
Yes. Search engines cannot see images, so they use the alt attribute to understand what the image shows and how it relates to the surrounding content. Accurate, keyword-aware alt text helps your images appear in image search results and contributes to the overall topical relevance of the page. Stuffed or missing alt text does the opposite.
Can I write the same alt text for multiple images?
No, if the images are different. Each alt text should describe the specific image it is on. Using the same string across multiple images tells search engines the images are identical and gives screen reader users no useful difference between them. If you have a batch of images, describe each one and the generator writes a distinct, accurate alt text for each.
Frequently asked questions
Is it really free?
Yes. You can write alt text right now with no signup and no credit card. After a number of messages we may ask for your email to save your work and keep going.
Do I need to sign up?
No. Just describe your image and get copy-ready alt text immediately. Email is optional and only used to save your alt text and unlock more messages.
Does it read the image file or just a description?
Just a description you type. In this free chat it cannot access a URL, scan your site, or read an uploaded image file. You describe the image in words and it writes the alt text from that. The output is only as accurate as the description you give.
Can it handle a batch of images at once?
Yes. Paste a numbered list of image descriptions and it returns numbered alt text to match, one per image, each concise and accurate. Good for tagging a whole page or a product gallery in one go.
Does it know when to use an empty alt attribute?
Yes. If you tell it an image is purely decorative, a divider, a background texture, a generic visual filler, it writes alt="" and explains why. That is the correct accessible choice for decorative images.
Can I add a target keyword to the alt text?
Yes. Tell it the keyword and it includes it once, naturally, if the image genuinely represents that term. It will not pad a description with a keyword that does not belong there, because that is both an accessibility failure and an SEO risk.
Does it work for product images, blog images, and other types?
Any of them. Describe the image and say where it sits, a product page, a blog hero, a team photo, a social share image, and the alt text is framed for that context. Product images name the product, blog images describe the subject, functional images describe the action.
What language can I use?
Any. Marisol reads what you write in and can write the alt text in the same language or a different one if you ask.
Why does my alt text start with 'image of' and is that a problem?
Yes, it is redundant. Screen readers already announce that an element is an image before reading the alt attribute, so starting with 'image of a woman' makes users hear 'image, image of a woman'. Start with the subject directly: 'A woman holding a coffee cup.' This generator removes that opener by default.
Is my information kept private?
Yes. Your conversation is not shared with anyone, not sold, and not used to train AI models. It is handled securely and backed by a clear privacy policy. If you add your email, we use it only to save your alt text so you can come back to it later.
Does it remember the alt text it wrote?
Within a session it builds on what you have already seen. To keep your alt text across visits, save it with your email. If you sign up to keep going, the conversation comes with you into your workspace.
What if I want my whole site's image alt text audited and kept current?
A one-off alt string is the easy part. Keeping every image on a live site correctly tagged as you publish is a wider job. When you are ready for that, you do not have to do it alone. You can hire a team of AI employees to handle your image SEO and accessibility at scale, and start for free.