AI Image Alt-Text Generator
Generate accessibility-ready image alt text with free AI — a short version under 125 characters plus a longer description. No sign-up.
Thinking…
Generate descriptive alt text from a description of your image. Tell the AI what the image shows — objects, people, actions, setting, and any visible text — and it returns a concise short version under 125 characters plus a longer 2–3 sentence version for contexts that allow it.
How to use AI Image Alt-Text Generator
- Describe what is in the image, including any visible text.
- Click "Generate alt text" to get short and long versions.
- Copy the version that fits where you will use it.
Who it is for
AI Image Alt-Text Generator is for making images accessible and findable: a shop with thousands of product photos, a blog post with diagrams, or a site that needs to meet accessibility requirements without describing every image by hand.
How it works
- You describe what the image shows, and a concise alt text under 125 characters is produced, plus a longer version for contexts that allow it.
- The short version is the length that actually gets read by a screen reader in a sentence flow.
- Two lengths are offered because alt text serves two purposes: a label in a sentence, and a description on a page that needs one.
What it cannot do
- It works from your written description, not from the image itself, so the quality of the alt text is the quality of the description.
- It cannot know what the image is for on the page, and purpose decides what alt text should say.
- Decorative images should have empty alt text, and this tool will not tell you that — it is a judgement about the page.
- Your description is sent to a third-party AI provider.
Frequently asked questions
Why do I describe the image instead of uploading it?
Free-tier text models cannot see images directly, so you provide a short description and the AI turns it into polished, accessibility-ready alt text.
What length should alt text be?
The short version stays under 125 characters — the accepted best practice for screen readers — while the long version gives 2–3 sentences for richer contexts.
Does it avoid "image of"?
Yes. It skips filler like "image of" or "picture of" and describes the content directly, which is what accessibility guidelines recommend.
Is it free?
Yes. The alt-text generator is free with no sign-up required.
Why can it not see my image?
The tool works from your written description rather than analysing the picture, which is why it costs nothing to run and why the quality depends on what you describe. Describe the content, not the file name.
Should decorative images have alt text?
No — a decorative image should have an empty alt attribute so a screen reader skips it. This tool will always write a description, so that judgement stays with you.
What length should I use?
The short version for an image inside a sentence, the longer one where the image carries information on its own. Around 125 characters is the practical ceiling for the short form.