Accessible image description within a length limit

Content editors and accessibility contributors can prepare alternative text when an image needs an accessible description of bounded length.

Write an accessible, length-bounded image description and obtain useful alternative text that stays within the requested range for the image.

How to use

1. In the input area, describe the main subject of the image, then add the context or action it shows.
2. Add one useful detail if it helps a reader understand the image, without overloading the description.
3. Run the composition step to obtain a length-bounded and readable alt text proposal.
4. Review the description as if you could not see the image, then adapt it to the image's real role on the page.

Example

Imagine a photo showing a team around a whiteboard during a workshop. You enter the subject, the action and a relevant detail such as the type of board. The result offers an accessible description to check against whether the image is informative or merely decorative.

Input

Main subject: a team in front of a whiteboard
Context or action: planning workshop
Useful detail: the board shows coloured notes

Limits and formats

• The tool cannot see the image; it works only from the details you type.
• Alt text that is too long or too vague can hinder screen reader users, so keep the description focused on what matters.
• The picker accepts text-based files, not image files or PDF documents.
• For a purely decorative image, check whether a description is useful at all or whether the attribute should remain empty in your context.

Where processing happens

Alt text composition runs in the browser. The words you enter stay on your device and are not sent to another party, so you can prepare a description without uploading the image or the draft.

Frequently asked questions

What belongs in good alt text?

It should convey the image's purpose on the page: the main subject, the useful action and details that help understanding. Avoid repeating a visible caption or adding facts the image does not show.

Does the tool analyse the image file?

No, it does not receive the image. You describe what the image shows, and the tool helps you phrase a bounded description. The quality therefore depends on how clearly you describe the visual.

How long should the alt text be?

Length depends on the image's role and the surrounding context. The tool suggests a bounded version, but you must confirm that it stays concise, useful and suitable for the space available.

Tools in the same category

• Smart background removal