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What Is Alt Text?

Alt text communicates necessary information when an image cannot be seen or loaded. Good alt text depends on the image’s purpose in context, not only what appears in the picture.


Key Takeaways

  • Alt text should communicate the image’s function or information in the current page context.
  • Decorative images should usually be ignored by assistive technologies; informative images need equivalent information.
  • AI can help draft suggestions, but humans still need to judge context, tone, and sufficiency.

Alt text is not an image title

The same image may need different alt text in different pages. A product image may need style and state, a news image may need event context, and a decorative background may not need to be announced at all.

The useful question is: if someone cannot see this image, what information or action cue would they miss?

AI suggestions can help, but they are not the final answer

AI can quickly draft image descriptions, especially when content teams handle many images. But AI may not know the image’s purpose on the page, and it may miss brand tone, key information, or details that should not be described.

DevCheck’s image alt suggestions should be treated as a starting point. They reduce the cost of review, but a human still needs to confirm whether the result fits the content context.

Frequently Asked Questions

Does every image need alt text?

Every image needs correct handling, but not every image needs readable text. Decorative images usually need empty alt text or should be hidden from assistive technologies.

How long should alt text be?

There is no fixed length. It should be long enough to serve the image’s purpose in context, without unrelated details or missing necessary information.

Related Pages

References