Generate alt text that improves SEO and accessibility
Describe your image and get 3 AI-generated alt text variations — concise, descriptive, and detailed. Each one is optimized for search engines and screen readers.
AI readiness tip
Alt text serves two audiences: screen readers for visually impaired users and search engine crawlers. Well-written alt text helps your images appear in Google Image Search and gives AI models context about your visual content.
Why alt text matters for SEO and accessibility
Alt text is one of the most overlooked SEO opportunities. It makes your images discoverable in Google Image Search, improves your page's topical relevance, and is legally required for accessibility compliance. Yet over half of all images on the web are missing it.
of images on the web are missing alt text on average
of all Google searches happen in Google Image Search
accessibility improvement with proper alt text on all images
Alt text best practices
Be specific and descriptive
Describe what the image actually shows, not what it's about. 'Golden retriever puppy playing with a red ball on a green lawn' is better than 'dog image' or 'cute puppy photo'.
Keep it under 125 characters
Most screen readers cut off alt text at 125 characters. Keep your descriptions concise but informative. For complex images like infographics, use a longer description in the surrounding text.
Include keywords naturally
If your target keyword fits naturally in the image description, include it. But never stuff keywords — 'SEO tool SEO software SEO platform' is harmful. The image description must make sense as a sentence.
Skip 'image of' and 'photo of'
Screen readers already announce that an element is an image. Starting alt text with 'image of' or 'picture of' is redundant. Jump straight to the description.
Use empty alt for decorative images
Decorative images (borders, spacers, background textures) should have empty alt text (alt=""). This tells screen readers to skip them, reducing clutter for visually impaired users.
Consider the image's context
The same image might need different alt text depending on context. A photo of a laptop on a tech review page should describe the laptop model; on a remote work blog, it should describe the work setup.
Stop writing alt text manually for every image
UnlimitedVisitors generates every article with optimized images, descriptive alt text, schema markup, and complete on-page SEO. Zero manual work.
Frequently asked questions
What is image alt text?
Alt text (alternative text) is an HTML attribute added to image tags (alt="description") that describes the image content. It's used by screen readers for visually impaired users, displayed when images fail to load, and read by search engine crawlers to understand image content.
Is this alt text generator free?
Yes, completely free with no signup or usage limits. Generate alt text for as many images as you need. The tool uses AI to create 3 variations — concise, descriptive, and detailed — so you can choose the best fit.
How long should alt text be?
Most screen readers truncate alt text at around 125 characters, so keep it concise. Our tool generates three lengths: concise (under 50 characters) for simple images, descriptive (50-100 characters) for most use cases, and detailed (100-125 characters) for complex images.
Does alt text help with SEO?
Yes, significantly. Alt text helps search engines understand image content, which improves your visibility in Google Image Search (10% of all Google searches). It also adds topical relevance to your page, strengthening your overall SEO for related keywords.
Is alt text required for accessibility?
Yes. The Web Content Accessibility Guidelines (WCAG 2.1) require alt text on all non-decorative images. Many countries enforce this through laws like the ADA (US), EAA (EU), and EN 301 549. Missing alt text creates legal risk and excludes visually impaired users.
Should every image have alt text?
All meaningful images should have descriptive alt text. Decorative images (borders, spacers, purely visual elements) should have empty alt attributes (alt="") so screen readers skip them. Never leave the alt attribute missing entirely — always include it, even if empty.