⚡ Instant Tools

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, upload, or take a photo

JPG, PNG, WebP, AVIF, and HEIC. HEIC is decoded on your device.

Writing alt text for accessibility

This page covers all four modes. If you only need WCAG-oriented alt text for screen readers, the dedicated accessibility page opens on that mode and explains what screen-reader users need from an image description.

WCAG alt text for screen readers

Open the accessibility-focused page for screen-reader alt text.

How to Use

  1. 1Upload the image you need alt text for
  2. 2Pick SEO, accessibility, social, or decorative mode
  3. 3Generate alt text with AI
  4. 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 queries

Accessibility

Any informative image that screen-reader users need described

Social

Captions for Instagram, LinkedIn, or X when auto-captions are weak

Frequently Asked Questions

How does this compare with other free alt text tools?

Many free generators return only plain text and set tight daily limits. This tool includes SEO, accessibility, social, and decorative modes, plus plain text, HTML attribute, and Markdown formats shown together. No signup is required.

What is decorative mode?

Decorative images (borders, spacers, pure visual 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 run longer when screen-reader context needs it. Avoid stuffing keywords.

Is my image stored?

No. The image is sent to one of several AI providers for description and is not stored on Instant Tools servers.

Related Tools

EXIF Viewer

View & strip photo metadata

Image Converter

Convert HEIC, AVIF, JPG, PNG, WebP

Identify From a Photo

Name plants, objects, and landmarks

AI Image Analyzer

Analyze any photo with AI

Prompt Diff

Compare system prompts and agent rules side-by-side

robots.txt Generator

Generate/validate robots.txt with AI bot controls