Generate Image Alt Text

Alt text that matches the image and the page

Alt text (the HTML alt attribute) is how you describe an image when it cannot be seen: screen readers read it aloud, browsers may show it when an image fails to load, and search systems use it as a strong hint about non-text content. Good alt is specific, truthful, and aligned with why the image appears on this page—not a generic filename or a list of keywords.

A generator will speed up first drafts, especially for large catalogs or social crops, but the best results still come from a quick human pass: fix wrong labels, drop marketing fluff that is not visible in the picture, and merge context from headings and captions. For storefronts and pack shots, describe what each frame uniquely shows—angle, variant, and included items—so alt stays accurate as you publish new crops.

Alt text complements—not replaces—sensible optimizing images for the web: smaller files load faster; clear alt explains what loads. Choosing the right image format for your website still matters for transparency, sharpness, and weight before anyone reads a single word of alt copy.

Alt text quick reference

Typical length target

Under about 125 characters for most images; longer only when complexity demands it

Decorative rule of thumb

Use empty alt="" when the image adds no information beyond ornament

Primary audience

Blind and low-vision users first; search clarity is a secondary benefit

Common automation risk

Over-confident labels for small objects, text in photos, or ambiguous scenes

What this tool will give you when it launches

• Three lengths: short for icons and tight CMS fields, descriptive for charts and heroes, SEO-focused for discoverable prose.
• Optional context: paste product names, article angles, or locale cues so wording lines up with the page.
• Copy buttons: one click per variant to paste into HTML, Markdown, or your CMS.
• Honest limits: the model only sees pixels—verify against the real layout and crop.

Tradeoffs and safe use

Automated alt can miss sarcasm, cultural context, or fine print in screenshots. It may also invent details when the scene is blurry or crowded. Always compare the suggestion to the actual pixels before publishing. For images for social media, remember that platform previews and on-feed crops can change what is visible; alt should reflect what the image communicates in your chosen crop, not a different framing.

Alt text is separate from EXIF and other image metadata: stripping metadata for privacy does not remove the need for alt in HTML. Likewise, a caption visible on the page is not a substitute for alt unless your platform explicitly maps them for assistive tech (many do not).

When not to lean on alt alone

• Charts and data graphics: summarize the takeaway in alt, then put data tables or long explanations in accessible body content.
• Images of text: if the text is essential, include the same words in alt or provide equivalent text nearby.
• Complex diagrams: short alt plus a longer description elsewhere beats a multi-paragraph alt string.

When transparency or cutouts change how an image reads against the background, transparency and the alpha channel can help you decide whether the “subject” is the object, the silhouette, or the interaction with the page chrome—then phrase alt accordingly.

Alt text and page performance

Keyword-heavy alt that repeats the same phrases across a site can read as spam to users and offers little extra signal to search engines. Prefer natural language. After descriptions are right-sized, you can still shrink bytes with our optimize image for web tool so pages stay fast without hiding meaning from assistive tech.

Generate alt text questions, answered