Alt text (alt attribute) describes an image's content or function for users and assistive technologies.

What are common alt text mistakes?

Missing alt on informative images, using filenames or generic words, keyword stuffing, and not describing the purpose of linked images.

Alt Text Checker

Q: When should alt be empty?

Use empty alt for decorative images or when the surrounding text fully conveys the same information.

Q: How long should alt be?

Keep alt concise and specific—often under ~125 characters, focusing on what's meaningful in context.

Scan a page to evaluate the presence and quality of image Alt, Title, and Description (from <figcaption> / aria-describedby). Built for accessibility and SEO workflows.

Tips: For SEO + a11y, keep Alt concise & task-oriented, use Title sparingly (it’s not a ranking factor), and put human-friendly context in Descriptions via <figcaption> or a referenced element (aria-describedby).

Alt Text – FAQ

What is alt text?

Alt text (alt attribute) describes the content or purpose of an image. Screen readers announce it, and it displays if the image fails to load.

When should alt be empty?

Use empty alt (alt="") for purely decorative images or when the image is sufficiently described by adjacent text (e.g., a detailed <figcaption>).

How long should alt be?

Keep it brief and specific—often under ~125 characters. Focus on what’s meaningful in context.

Common mistakes

❌ Missing alt on informative images.
❌ Using filenames or generic text (“image”, “photo”).
❌ Keyword stuffing or overly long descriptions.
❌ Not describing the purpose of linked images.