Image Alt Text Generator
Free AI image alt text generator — upload an image and get 3 descriptive, SEO-friendly alt text options under 125 characters. No signup.
About the Image Alt Text Generator
This free AI alt text generator looks at your image and writes three descriptive alt text options, each under 125 characters and ready to paste into your HTML, CMS or social post. Drop in an image, optionally add the page context (like "blog post about hiking in the Alps") so the description matches how the image is used, and copy the option you like.
Your image is downscaled in your browser before being sent for analysis, so uploads are fast even for large photos, and the original file never leaves your machine at full resolution. There is no signup and no watermark.
Good alt text serves two audiences: screen reader users, who rely on it to understand the image, and search engines, which use it to index images and understand the page. Review the AI's suggestion before using it — you know the image's purpose on your page better than any model — and remember that purely decorative images should get an empty alt attribute instead.
How to Use the Image Alt Text Generator
- 1Upload or drag in an image (JPG, PNG, WebP and other common formats).
- 2Optionally describe the page context so the alt text matches the image's purpose.
- 3Click Generate alt text and review the 3 options with character counts.
- 4Copy the best option into your image's alt attribute.
Frequently Asked Questions
Is this alt text generator free?
Yes — free with no signup. Requests are rate-limited per visitor to keep the service fast for everyone.
How long should alt text be?
Aim for under 125 characters — historically the point where some screen readers began chunking text, and still a good discipline for keeping descriptions concise. Every option this tool generates targets that limit, and the counter flags any that exceed it.
Should alt text start with "image of" or "picture of"?
No — screen readers already announce that an image is present, so those phrases waste characters. The generator is instructed to skip them and describe the content directly, e.g. "Golden retriever catching a frisbee on a beach at sunset".
What about decorative images?
Images that add no information — spacers, background flourishes, purely aesthetic dividers — should have an empty alt attribute (alt="") so screen readers skip them entirely. Missing the attribute altogether is worse than empty: some screen readers then read the file name aloud.
Does alt text help SEO?
Yes — it is the primary signal for Google Images and helps the page's overall topical relevance. Describe the image honestly and include a keyword only when it genuinely fits; keyword-stuffed alt text harms accessibility and can be treated as spam.
Is my image uploaded at full size?
No — your browser downscales the image to a maximum of 800 pixels before it is sent for AI analysis, then the description comes back to your browser. Avoid uploading images containing sensitive or private information to any online AI tool.