Free Alt Text Writer & Checker

Write alt text and check it against the rules that matter — length, redundant openings, keyword stuffing — then copy the finished img markup.

Runs entirely in your browser — nothing is uploaded

Read this first. This tool cannot see your image. Nothing that runs in your browser can. What it does is turn the filename into a starting point, check what you write against the rules that matter, and build the markup — the describing is yours, because you are the only one here who has actually looked at the picture.

Drop an image here to see it while you write (optional)JPEG, PNG, WebP, GIF, AVIF or SVG, up to 25 MB each.

Alt text

0 characters — aim for 10 to 125

Target keyword (optional)

Title attribute (rarely needed)

This image is purely decorativeA divider, a background texture, or an icon sitting next to text that already says the same thing. These get alt="" so screen readers skip them.

Checks

Alt text written
Problem
No description yet. A missing alt attribute leaves screen reader users with nothing; an empty one on a meaningful image is just as bad.

Your markup

<img src="your-image.jpg"
     alt=""
     loading="lazy"
     decoding="async" />

Width and height are included because they reserve space while the image loads, which stops the page jumping — one of the three Core Web Vitals.

Your images stay on your device. Every one of these image tools runs entirely in your browser — nothing is uploaded, nothing is stored, and there is no server involved. You can check for yourself: disconnect from the internet after this page loads and the tool still works.

What this tool does not do: This cannot see your image, and no browser-based tool can. It turns the filename into a starting point and checks what you write — the describing is yours.

How to use this tool

Drop the image so you can see it while you write.
Answer one question: if this image vanished, what would the reader miss?
Write that. The checks below will tell you if it is too long, repetitive or padded.
Copy the markup.

What is Alt Text Writer?

Alt text exists so that someone who cannot see the image still gets what it conveys. That is its purpose, and every SEO benefit follows from doing it well — Google uses alt text to understand images, and images described accurately are the ones that show up in image search.

The common failure is treating it as a keyword slot. Alt text stuffed with search terms is unpleasant to listen to, does not describe anything, and has been treated as a spam signal for many years. Accurate description is both the accessible answer and the effective one.

Decorative images are the exception worth knowing. A divider or a background texture conveys nothing, and an empty alt="" tells a screen reader to skip it. Omitting the attribute entirely is different and worse — then the screen reader may read out the filename.

Best practices

Describe what matters about the image in its context, not everything in it.
Keep it under 125 characters; longer explanations belong in the page text.
Skip "image of" and "picture of" — a screen reader already says it is an image.
Use alt="" for purely decorative images, never a missing alt attribute.
For a linked image, describe where the link goes rather than the picture.
For charts, give the takeaway: "Sales rose 40% between January and June", not "bar chart".

Frequently asked questions

Why can this not write the alt text for me?

Because describing a picture requires seeing it, and no code running in your browser can do that. Doing it properly would mean sending your image to a vision model over the internet — which would break the promise that these tools do not upload your files, and would still get the context wrong, since the right description depends on why the image is on the page.

How long should alt text be?

Long enough to convey what matters, usually one clear sentence. Some screen readers cut off around 125 characters. If an image needs a paragraph, that paragraph belongs in the visible text where everyone benefits.

Should I put my keyword in the alt text?

Only if it genuinely describes the image. Accuracy first. A relevant keyword that fits naturally is fine; forcing one in makes the description worse for the people alt text exists to serve.

What about the title attribute?

It is rarely useful. It shows a tooltip on hover, which touch users never see, and screen readers handle it inconsistently. Alt text does the real work. The field is here because people ask for it, not because you should fill it in.