AI Alt Text Generator — SEO & Accessibility
Free AI image alt text for SEO, WCAG accessibility, social captions, or decorative images. Get plain text, HTML alt="...", and Markdown in one click — no signup.
Drag and drop or click to upload
How to Use
- 1Upload the image you need alt text for
- 2Pick SEO, accessibility, social, or decorative mode
- 3Generate alt text with AI
- 4Copy the format you need (plain, HTML, or Markdown)
When to Use Each Mode
SEO
Blog heroes and product thumbnails that should rank for visual queriesAccessibility
Any informative image that screen-reader users need describedSocial
Captions for Instagram, LinkedIn, or X when auto-captions are weakFrequently Asked Questions
What makes this different from other free alt text tools?
Most free generators only return plain text with tight daily limits. Here you get SEO, accessibility, social, and decorative modes — plus plain, HTML attribute, and Markdown formats shown together — with no signup.
What is decorative mode?
Decorative images (borders, spacers, purely aesthetic flourishes) should use alt="". Decorative mode tells you when empty alt is appropriate and why.
How long should alt text be?
SEO mode targets under 125 characters. Accessibility mode may be a bit longer when needed for screen-reader context. Avoid stuffing keywords.
Is my image stored?
No. The image is sent to Google Gemini for description and is not stored on Instant Tools servers.