Alt text that says what matters
People who use a screen reader hear your post instead of seeing it. Alt text is how they get the image: who or what is in it, what is happening and any words it shows. The generator looks at your image and writes one alt text within the length you choose, plus a shorter alternative for networks or posts where less is better.
It follows the W3C's advice for text alternatives: describe the image's purpose as concisely as possible, put the most important detail first and leave out words like "image" or "picture". Text inside the image, such as a headline on a graphic, is copied word for word.
If the AI part is switched off, the checklist on this page works the same way.
Tips for better alt text
- Write for the post. The same photo may need different alt text in a product launch and in a team update: add what the post is about.
- Describe, don't guess. Leave out names, ages or feelings you cannot see in the image.
- Keep numbers and text exact. For a chart or a quote card, include the key figure or the words.
- Skip decorative images. An image that adds nothing to the message can have empty alt text.
- Check before you post. AI can misread small details, so read the result against the image.
From alt text to a published post
Alt text belongs to the image you post. In PostBoost you can add alt text to each image in the composer, write it with AI, check the image sizes for every network and schedule the post to all of them from one calendar.