Image Alt Text Generator

Drop an image to prepare concise alt-text notes, accessibility checks, and model cache behavior without uploading the file.

Last updatedHow we build & check our tools

Interactive Tool

This tool runs in your browser and is loading now.

Enter your values once it appears to see your results.

How Image Alt Text Generator works

Press Load model once: your browser downloads EfficientNet-Lite0 image classifier (MediaPipe, int8) and EfficientDet-Lite0 object detector (MediaPipe, int8) (22 MB) from this site and keeps it in its cache. Then add your file and press Draft alt text. The model runs on this device, so nothing you enter is sent to a server. Until the model is loaded, or if your device cannot run it, the tool falls back to a simple keyword check and labels the result as the fallback.

Two models run on the image. An object detector finds and counts things from the 80 COCO categories (person, dog, car, bottle and so on) with at least 40% confidence, and an image classifier names the overall subject from the 1,000 ImageNet categories.

The draft alt text is assembled from those results with a fixed template ("Photo of two people and a dog, likely a park bench."). It is a starting point: the models cannot read text in the image, recognise people or brands, or know why the image is on your page, which is what good alt text usually needs.

Worked example

The model's output for the built-in sample, recorded on a desktop browser. Your run may word things slightly differently.

The sample image used for this example

Photo: Marco Del Torchio, CC0, via Wikimedia Commons.

Draft alt text
Photo of two benches and a dog, likely a miniature poodle.
Objects found
2 × bench, 1 × dog
Top image label
miniature poodle
Image size
720 × 480 px

Limitations

  • The models only know the categories they were trained on. Anything outside them is reported as the closest category they do know, or not at all.
  • They cannot read labels, text or logos in the photo.
  • Results describe the input you gave, not the real-world situation behind it. Review them yourself before acting.

Good uses

  • Accessibility QA
  • CMS image uploads
  • Ecommerce product pages
  • Blog illustration review

Frequently Asked Questions

Common questions about the Image Alt Text Generator

No. The model files download from this site once, and then everything runs in your browser tab. The file you choose is never sent to a server, and closing the tab discards it.
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