Image Alt Text Checker
An alt text checker is a tool that scans HTML for img elements and reads each alt attribute. It treats a…
Free alt text generator
Describe the image in a few words and get clean alt text plus ready to paste HTML.
Result
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0Keyword uses
The free alt text generator runs in your browser, needs no sign-up and never sends what you type anywhere.
Quick answer
An alt text generator turns what an image shows, its purpose and its context into a short description for the img alt attribute. Good alt text describes the subject and the detail that matters on this page, usually in one phrase under about 125 characters, uses a keyword only if it is accurate, and is empty (alt="") for decorative images.
What is a alt text generator?
An alt text generator is a tool that builds the alt attribute for an image from structured details: the subject, the action or key detail, and the setting. It changes the logic by purpose: informative images describe content, linked images describe the destination, images of text repeat the text and decorative images get an empty alt.
How do you use the Alt Text Generator?
- Choose the image purpose: informative, product, functional, image of text, chart or decorative.
- Describe the main subject, then add the action or key detail and the setting if they matter.
- For buttons, links or text images, enter the destination or the exact words in the image.
- Optionally add the page keyword and file name to check for stuffing and generic names.
- Copy the generated img tag, set the real width and height, and paste it into your page.
What is good alt text for SEO?
Good alt text is a short, accurate description of what the image shows in the context of the page, such as "Dalmatian puppy playing fetch". Google's image SEO best practices call alt text the most important attribute for image metadata and warn against filling it with keywords.
How long should alt text be?
There is no official character limit, but one concise phrase or sentence, often under about 125 characters, works for most images. Write as much as a sighted reader would take from the image on this page, no more. Put long explanations of charts in the page text or a caption.
When should alt text be empty?
Use an empty alt (alt="") when the image is purely decorative or repeats text that is already next to it. The W3C decision tree recommends this so screen readers skip the image. Never remove the alt attribute completely, because some screen readers then read out the file name.
Quick reference
| Image type | Alt text approach | Example |
|---|---|---|
| Informative photo | Subject, action, setting | Golden retriever puppy chewing a blue rope toy on a wooden kitchen floor |
| Product photo | Brand or product, variant, view | Stainless steel water bottle, 750 ml, matte black, side view |
| Linked image or icon | Where it goes or what it does | Download the SEO checklist PDF |
| Image of text | The exact text | Free shipping on orders over $50 |
| Chart or diagram | Short summary plus pointer to data | Bar chart of organic clicks by month. Full data in the text below. |
| Decorative | Empty alt | alt="" |
Worked example
Example
Example: on a page about puppy chew toys, a photo shows a golden retriever puppy with a rope toy. The tool writes "Golden retriever puppy chewing a blue rope toy on a wooden kitchen floor", 72 characters and 13 words. The keyword "puppy chew toys" is not used word for word, which is fine because the description is accurate and already relevant.
Learn more
Frequently asked questions
Does alt text help Google rank images?
Yes, Google uses alt text together with computer vision and the page content to understand an image. Accurate alt text helps your images appear for relevant searches in Google Images. It works best with a descriptive file name, nearby text and a caption that match.
Should I put keywords in alt text?
Only when the keyword truthfully describes the image. Google shows a stuffed alt like "puppy dog baby dog pup pups puppies" as a bad example. Write for a person who cannot see the image first; relevance for search follows naturally.
Should alt text start with "image of"?
No. Screen readers already announce that the element is an image, so "image of" or "picture of" wastes words. The exception is when the medium matters, for example "Oil painting of" or "Screenshot of the Search Console Page indexing report".
What alt text should a logo have?
A logo that links to the homepage should describe the destination, such as "Brightside Plumbing home". A logo used as a heading or brand mark uses the company name. If the brand name already appears as text right next to it, an empty alt avoids repetition.
Can AI write alt text for me?
AI image captioning can draft alt text, but it does not know why the image is on your page. Always check the draft, correct mistakes and add the detail that matters for the reader. This tool avoids that problem by building the alt from what you tell it.
Is alt text the same as the title attribute?
No. The alt attribute is the text alternative used by screen readers and search engines when the image cannot be seen. The title attribute shows a tooltip on hover for some users only and is not a replacement for alt text.
Sources
Facts checked against these official pages. Read how I check facts in my editorial policy.
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