Property Photo Alt Text Preview

How Property Photo Alt Text Preview 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 Analyze locally. 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.

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

Suggested file name

bench-dog-miniature-poodle.jpg

File weight

Light

The model

The files are served from this site, versioned so a cached copy is never stale. Nothing is fetched from a third party while you use the tool.

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.
• This is not financial, tax or legal advice. Confirm anything important against your own records and with a qualified professional.

Good uses

• Batch-drafting alt text for a new listing gallery before it goes live
• Retrofitting an existing site where hundreds of photos ship with empty or filename alt
• Checking whether a photo is descriptive enough to caption at all, or is a duplicate angle worth cutting
• Sanity-checking vendor or MLS-imported alt text you did not write