Quick answer
Good alt text describes the image clearly and concisely for people who cannot see it. When done well, it also gives search systems a cleaner signal about the image context, but its first job is accessibility, not keyword stuffing.
Why this matters
Modern publishing teams often rely on AI to accelerate repetitive tasks, but image description quality still depends on editorial judgment. An automated draft can help, yet it cannot decide what context is most important for your article or your audience.
That is especially true when the featured image is central to Discover performance. A clear image, the right size, and a clean Discover image strategy all work better when the surrounding metadata is disciplined rather than bloated.
A simple framework for writing better alt text
Editors do not need complicated formulas. They need a repeatable checklist that keeps the description readable, specific, and connected to the purpose of the image.
- Name the main subject first, especially if the image illustrates the article's core point.
- Add one useful contextual detail such as the action, comparison, or interface element shown.
- Skip filler like image of or photo of unless it adds meaning.
- Do not cram multiple keywords into a single sentence just because the page targets them elsewhere.
How to use AI without publishing robotic descriptions
AI works best here as a drafting assistant, not a final authority. Let it produce a starting description, then edit for accuracy, tone, and context before the image ships.
- Generate a first-pass description from the visual itself.
- Compare the draft against the article intent and remove details that do not matter.
- Check whether the same phrasing repeats across many posts, then rewrite for specificity.
- Approve the final text only after the image, caption, and headline still tell one coherent story.
Common mistakes
Bad alt text usually comes from either laziness or over-optimization. Both reduce usefulness, and both are easy to spot once a team starts auditing its own library.
- Copying the article headline directly into the alt field for every featured image.
- Publishing AI-generated descriptions that mention irrelevant details or hallucinated objects.
- Stuffing multiple SEO phrases into a single description that no human would say naturally.
- Leaving the field empty for meaningful editorial images that genuinely need description.
Practical implementation note
DiscoverImg's alt text features are most useful when they are embedded inside a review workflow, not treated as a one-click replacement for editorial QA. The tool can accelerate description drafts, but the final standard should remain precise and accessible.
If you want to strengthen the rest of the visual stack, read the featured image guide and the og:image guide, then finalize the file in DiscoverImg Optimizer.
Frequently asked questions
Should alt text include the page keyword?
Only when the keyword fits naturally and truthfully describes the image. Accessibility and clarity come first.
Can AI write alt text for my whole blog?
AI can draft it, but a human should still review for accuracy, repetition, and context before publication.
How long should image alt text be?
Most good descriptions are short. One natural sentence is usually enough for a featured image unless the visual is unusually complex.
Is alt text important for Discover specifically?
Discover is not driven by alt text alone, but good descriptive metadata supports overall image understanding and keeps your publishing workflow disciplined.
When can I leave alt text blank?
Only when the image is purely decorative and adds no informational value. Editorial featured images usually deserve meaningful description.
