Free AI Alt Text Generator
Upload an image or describe it — our AI writes WCAG-accessible, SEO-optimised alt text in seconds. Five styles, 3-variation mode, session history, and CSV export. Completely free, no signup.
Input Method
Type what the image shows and AI generates the alt text.
Choose Alt Text Style
Full scene detail for screen readers
Include objects, people, actions, setting, and colours for best results.
0 charsThe page topic helps AI pick more relevant keywords.
✍️
Generated alt text will appear here
Try a sample description to get started
What Is Alt Text and Why Does It Matter for SEO and Accessibility?
Alt text (alternative text) is the written description inside an <img> tag. It does two critical things: screen readers read it aloud for visually impaired users, and Google uses it as the primary signal to index and rank your images. Missing or poor alt text means lost Google Image Search traffic, lower Lighthouse accessibility scores, and potential WCAG 2.1 compliance failures. Our free AI alt text generator goes further than any text-only tool — you can upload your actual image and let the AI look at it directly, or type a description if you prefer. Choose from five specialised styles (Descriptive, SEO-Focused, Short & Simple, E-commerce, Technical/Docs), get up to three variations to compare, and copy a ready-to-paste HTML snippet — all in under 10 seconds, no account needed.
How to Use the AI Alt Text Generator
- 1
Choose your input method
Switch between Describe Image (type what the image shows) and Upload Image (let the AI analyse the actual file). The upload mode supports JPG, PNG, WebP, and GIF.
- 2
Pick a style
Choose the output format that matches your goal — Descriptive for accessibility-first content, SEO-Focused for higher Google Images rankings, Short & Simple for breadcrumbs or thumbnails, E-commerce for product listings, or Technical/Docs for UI screenshots.
- 3
Add page context (optional)
Enter the topic of the page where the image lives (e.g. "organic skincare products"). This lets the AI weave relevant keywords into the alt text naturally.
- 4
Generate or get 3 Variations
Click Generate Alt Text for a single best result, or 3 Variations to get three options to compare side-by-side. The colour-coded character bar shows whether you are within the recommended 125-character limit.
- 5
Copy and paste
Click Copy next to your preferred result, or Copy the HTML snippet ready for your img tag. Your recent generations are saved in the history panel and can be exported as a CSV.
Alt Text Best Practices
Be specific — describe the actual scene, not just the subject.
Stay under 125 characters — screen readers often truncate longer text.
Include keywords that genuinely relate to the image and page topic.
Mention text visible in the image (banners, labels, signs).
Do not start with "Image of" or "Picture of" — screen readers say that automatically.
Do not keyword-stuff — it reads as spam to both users and Google.
Do not leave alt blank on informational images — only for purely decorative ones.
Do not repeat the caption word-for-word if a visible caption already exists.
Alt Text Examples: Bad vs Good
Bad — filename used as alt text
<img src="DSC_0489.jpg" alt="DSC_0489" />Mediocre — too vague
<img src="photo.jpg" alt="woman working" />Good — Descriptive style
<img src="photo.jpg" alt="Woman in red blazer presenting bar charts on a large screen in a sunlit boardroom" />Good — SEO-Focused style
<img src="photo.jpg" alt="Remote team collaboration — professional woman reviewing project analytics dashboard" />Why This AI Alt Text Generator Stands Out
Direct Image Upload
Upload a real image and let AI analyse it visually — no manual description needed. Supports JPG, PNG, WebP, GIF.
Five Specialised Styles
Descriptive, SEO-Focused, Short & Simple, E-commerce, and Technical/Docs — purpose-built prompts for each.
Three Variations at Once
Generate three options in one click and pick the one that fits your tone and character-count target.
Page Context Awareness
Tell the AI what the page is about and it will weave relevant keywords into the alt text naturally.
Visual Character Bar
Colour-coded progress bar (green/yellow/red) shows at a glance whether you are within the 125-char limit.
Session History
Your last 20 generations are saved in the history panel so you can revisit and compare results.
CSV Export
Download your session history as a CSV — useful for batch workflows or handing off to a content team.
One-Click Copy + HTML Snippet
Copy the alt text or the full ready-to-use HTML img snippet directly to your clipboard.
Common Use Cases
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E-commerce
Product images on Shopify, WooCommerce, or Amazon listings need keyword-rich alt text for Google Shopping visibility.
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Blogs & Editorial
Featured images and inline photos on WordPress, Ghost, or Webflow sites benefit from both accessibility and image SEO.
📱
Social Media
Facebook, Instagram, X/Twitter, and LinkedIn all have alt text fields for uploaded images. Make them meaningful.
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SaaS & Docs
UI screenshots in help centres and technical documentation need clear, functional alt text for visually impaired developers.
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Photography Portfolios
Photography sites rank better when each portfolio image has a well-written descriptive alt attribute.
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Marketing & Ads
Landing page hero images, blog banners, and ad creatives all need alt text for both SEO and accessibility audits.
How Alt Text Improves SEO Rankings
Google confirms that alt text is the most important on-page signal for ranking in Google Image Search. When a user searches for a product, place, or concept, Google cross-references page text, file names, and alt attributes to decide which images to surface. A page with well-written alt texts is far more likely to appear in both regular and image search results than an identical page with empty or generic alt text.
- →Alt text is the primary ranking signal for Google Image Search, which drives a significant share of image-related queries.
- →Poorly written alt text is flagged in Core Web Vitals accessibility checks, which indirectly affect overall ranking.
- →Alt text reinforces the semantic theme of the page, helping all keywords rank — not just image results.
- →For e-commerce sites, optimised product image alt text is directly linked to Google Shopping impression share.
Frequently Asked Questions
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