Free Alt Text Generator for Images

Upload any image or paste a URL — get 3 AI-written alt text options instantly. Accessible, SEO-friendly, free. Works for JPG, PNG, WebP and GIF.

✦ Powered by AI
⚡ No signup required
🆓 Always free

Drop image here or click to browse

JPG, PNG, WebP, GIF — max 4MB

What is alt text for images?

Alt text (alternative text) is a short written description added to an image's HTML img tag via the alt attribute. It serves two purposes: it lets screen readers describe the image to visually impaired users, and it tells search engines what the image shows — helping your pages rank in Google Image Search.

Example:
<img src="team-meeting.jpg" alt="Three colleagues reviewing a project plan on a whiteboard">
Good alt text
"Woman smiling while working on a laptop in a coffee shop"
Bad alt text
"image1.jpg" or "photo" or leaving it blank

How to write good alt text for images

Be specific
"Red bicycle leaning against a brick wall" not "bicycle"
Keep it short
Under 125 characters. Screen readers truncate longer text.
Add keywords naturally
Include relevant keywords but write for humans first.
Skip "image of"
Screen readers already announce it as an image.

Alt Text Character Limit — How Long Should It Be?

The recommended alt text limit is 125 characters. Most screen readers (JAWS, NVDA, VoiceOver) stop reading after 125 characters, so anything longer gets cut off for visually impaired users. Google also processes the first ~100–125 characters most reliably for image SEO.

125
Max characters (screen readers)
50–100
Ideal range for most images
0
For decorative images (use alt="")

Our AI-generated alt text options stay under 125 characters by default — each result shows a live character count so you can confirm before copying.

Frequently Asked Questions

What is alt text?
Alt text is a written description of an image in the HTML img tag. It helps screen readers describe images to visually impaired users and helps search engines understand image content.
Does alt text help SEO?
Yes. Alt text helps Google understand your images, improving rankings in Google Image Search and contributing to on-page SEO. Include relevant keywords naturally.
How long should alt text be?
Under 125 characters. That's short enough for screen readers to read naturally while still describing the image accurately.
Is this tool free?
Yes, completely free. No signup, no account, no limits.
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