Free Alt Text Generator - AI Image Alt Text Tool
Generate descriptive alt text for any image.
Alt text on every image - automatically.
Sight AI generates descriptive alt text for every image we add to your articles. Accessible, SEO-friendly, never missing. 1,500 free AI credits to try.
How it works
- 1
Upload an image
JPG, PNG, WebP, or GIF up to 6MB. Runs locally up until the AI call - no permanent storage.
- 2
Add page or product context
Optional but powerful. "Product image for a black aluminum standing desk" yields way better alt text than a generic call.
- 3
Pick image type
Descriptive (most common), product (e-commerce), or decorative (returns empty alt).
- 4
Copy the alt text
Paste into your CMS or HTML. Long descriptions go in figure captions or aria-describedby.
A small detail that compounds.
Alt text is the cheapest accessibility win you can make - and a measurable SEO signal. Google Images is a major traffic source, and AI assistants increasingly use alt text to understand visual content on your pages.
Most teams either skip alt text entirely or auto-generate "image1.jpg"-style placeholders. A real, descriptive alt text takes 30 seconds and lifts both your SEO and your accessibility score.
Generated images, generated alt text - every article.
Sight AI doesn't just write your articles - our Image Agent generates custom, on-brand visuals for every post. Every one ships with descriptive, accessible alt text by default.
No more articles with hero images that say "image1.png" in the alt slot. Your published library is consistently accessible, image SEO–optimized, and ready for Google Images traffic.
- Custom AI-generated images per article (no stock photos)
- Accessibility-first alt text on every image
- Image filename + caption auto-set for image SEO
- Image schema markup included where relevant
Common questions.
How long should alt text be?
Under 125 characters. Screen readers cut off after that, and search engines stop weighting beyond it.
When should alt text be empty?
For purely decorative images that don't carry meaning - borders, dividers, dust effects. Use empty alt="" so screen readers skip them.
Can I just use the file name?
No - file names like "DSC_2837.jpg" are useless. Even "happy-dog.jpg" only describes one image. Real alt text is specific to the visible content.
Does my image data get stored?
No. We send the image to the AI for one-time analysis and then discard it. We don't persist images server-side.
Get 1,500 free AI credits with Sight AI
Sight AI writes long-form, SEO-optimized articles for you and tracks how AI assistants like ChatGPT and Claude see your brand. Create a free account to claim your 1,500 free AI credits.
1,500 free AI credits, AI visibility tracking, and our full publishing suite included.
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