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Image Alt Text Generator: on-device AI writes alt text, titles, file names and keywords

Alt text matters for accessibility and for image search. Drop in a batch of images; AI on your device drafts the descriptions so you only review them, add your product keyword and paste them into your CMS.

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Privacy: Images are processed only in your browser and never uploaded to a server; nothing is kept after you close the page.

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How to use the Image Alt Text Generator

  1. Choose the output language and image type (product photo, editorial image or decorative).
  2. Optional: enter a product name or page keyword to weave into the alt text.
  3. Drop one or more images; the AI detects objects, counts, colours and background and drafts alt text, a title, a file name and keywords.
  4. Review and edit each one, then copy the HTML or export a CSV.

What makes good alt text?

One sentence describing what in the image matters for understanding the page: the subject, its colour or number, and what is happening. Keep it under about 125 characters, where many screen readers cut off. Do not start with “image of” and do not stuff keywords. For product photos include brand, model and colour; purely decorative images should use an empty alt (alt="") so screen readers skip them.

How does the AI “see” the image?

Two open-source models run on your device. EfficientDet-Lite0 finds and counts 80 kinds of objects, including people, animals, furniture, tableware and electronics. EfficientNet-Lite0 picks the main subject from 1,000 categories. The tool combines them with the main colour and background brightness into a sentence. It cannot read text, brands or fine details, so treat the result as a draft and add key facts.

Rewrite with Chrome built-in AI

If recent desktop Chrome has built-in Gemini Nano enabled, click “Rewrite with Chrome built-in AI” to turn the draft and the image into a more natural sentence, also on your device. Without it, the local model draft remains.

File names and keywords

Search engines read image file names too. The tool suggests lowercase ASCII names with hyphens, such as red-ceramic-mug-white-background.jpg, plus a few keywords for titles and tagging. The CSV keeps the original file name so you can match them up.

Frequently asked questions

Are images uploaded?

No. Both models download from this site (about 10 MB in total, cached afterwards) and run in your browser.

How many images at once?

Up to 50, processed one after another. Edit any result and export them all as CSV.

Can I write Chinese alt text?

Yes. The output language is independent of the page language.

Why doesn’t it know my product name?

General models only know common categories, not brands, models or styles. Add them in the keyword field or edit the result.

Is longer alt text better?

No. Stay under about 125 characters, focus on the subject and what matters for the page, and avoid repeating nearby text.

What about decorative images?

Choose “Decorative” and the tool shows the alt="" markup and why.

Image Alt Text Generator practical guide and common questions

What does an Image Alt Text Generator do?

One sentence describing what in the image matters for understanding the page: the subject, its colour or number, and what is happening. Keep it under about 125 characters, where many screen readers cut off. Do not start with “image of” and do not stuff keywords. For product photos include brand, model and colour; purely decorative images should use an empty alt (alt="") so screen readers skip them.

Who is this for, and when is it useful?

Webmasters, editors and online sellers who need alt text for product and article images for SEO and accessibility.

How do I use this Image Alt Text Generator?

Choose the output language and image type (product photo, editorial image or decorative). Optional: enter a product name or page keyword to weave into the alt text. Drop one or more images; the AI detects objects, counts, colours and background and drafts alt text, a title, a file name and keywords. Review and edit each one, then copy the HTML or export a CSV.

How should I interpret the results?

Two open-source models run on your device. EfficientDet-Lite0 finds and counts 80 kinds of objects, including people, animals, furniture, tableware and electronics. EfficientNet-Lite0 picks the main subject from 1,000 categories. The tool combines them with the main colour and background brightness into a sentence. It cannot read text, brands or fine details, so treat the result as a draft and add key facts.

Where is the work performed, and which services receive data?

Image Alt Text Generator: The recognition models are downloaded from this site and run in the browser; photos and results are processed only on your device and never uploaded, and any saved log stays in this browser.