Bulk Alt Text Generator
Paste a URL. The Image Alt Checker's scan runs first, then a vision model writes alt text only for images that have none or sit in an unnamed link, up to 8 a run. Decorative images are left alone, useless alt gets a rewrite button, and every description is checked against the checker's rules first.
Short answer
A bulk alt text generator reads the images on a page and writes descriptions for the ones that need them. It decides the way the checker does: images with no alt and image-only links with no name are written for, decorative images and usable alt are left alone, and each description is checked on the way out.
The checker decides which images get words
A vision model will describe anything you show it, including the spacer gif and the divider that a careful developer already marked decorative. So the model is not shown the page. It is shown the images the Image Alt Checker classified as errors, and nothing else.
| The checker's finding | What this tool does | Why |
|---|---|---|
| No alt attribute | Writes a description | The image has nothing; a screen reader reads the filename |
| Image-only link, no name | Names the destination | The alt becomes the link's accessible name |
| Filename, image-of, too long, duplicate | Rewrite button per image | Present and useless, but each one is a judgement and a bill |
| Decorative, alt="" | Nothing | Correct markup for decoration. Writing over it makes the page worse |
| Already described | Nothing | Finished. Rewriting it would be spending money to change a working page |
| Named by aria-label, role conflict | Nothing | Markup fixes, not writing problems; the checker explains each |
The rules are one module shared by both tools, so a page run through the checker and then through this generator gets one opinion about each image, not two.
What the model writes is checked before you see it
The generated descriptions are tested against the same rules the checker applies to the alt already on your page. A description that fails is still shown, with the rule named, because the fix is usually a word:
- Under 125 characters. Alt is read in one uninterrupted pass, so anything longer is skipped. The model is asked for less; the length is checked anyway.
- No "image of". A screen reader announces the image before reading the alt. The prefix is stripped mechanically when it appears.
- Not a filename. A filename-shaped answer usually means the model could not see the image. It is flagged, not trusted.
- Names the link, for image-only links. The link's URL is in the prompt so the alt says where it goes rather than what the picture shows.
Why 8 images a run
Every image is one vision call, which makes this the costliest tool on the site by some distance. The cap keeps a run affordable and a 300-image page from becoming a bill. When more images qualify the page says so, and a second run takes the next batch.
What this generator cannot know
It reads one page and the images on it. It can write a description that is the right shape and length, and it cannot know three things that decide whether the description is right:
- What the image is for. A photo of a laptop on a pricing page and the same photo in a review mean different things. The model sees the page title; you see the intent.
- Whether the same gap repeats. A missing alt here is usually a missing alt in the template, on every page that uses it. That is a crawl.
- Which pages matter. Fixing alt on a page nobody visits is tidy. Fixing it on the page that earns image-search impressions moves something.
The second and third are what CrawlRaven answers by joining a technical crawl with your Search Console data: the finding repeats 340 times, and here are the pages worth fixing first. This tool is the fix for one of them, done by hand.
Using the generator on a real page
Start from the Image Alt Checker, which links every page with errors straight here. Then:
- Read the scan first. It says how many images have no alt, how many links have no name, and how many are decorative and correctly so.
- Read each description against its thumbnail. The model names what it sees. You know what the image is doing on the page; edit where they differ.
- Rewrite the useless ones deliberately. A filename as alt is worth a rewrite; a duplicate may be a template and better fixed once in the template.
- Copy all or download the CSV, paste the alt into your CMS, then run the checker again to confirm the page comes back clean.
An image that is skipped says why: a bot block, a login, a format the model does not read, or a file over the size ceiling. None of those is billed. For what good alt text looks like, and where it sits in image optimization more broadly, the glossary entries are the short version.
What the generator reports
The checker's scan
Same classification as the Image Alt Checker: missing, unnamed link, decorative, useless, described
Writes only for errors
Images with no alt and image-only links with no name. Never decorative, never usable alt
Links get a destination
For image-only links the alt names where the link goes, with the URL in the prompt
Checked on the way out
125 character ceiling, no image-of, not a filename, applied by the checker's own code
Rewrite on request
Filename, redundant, long and duplicate alt get a button each, never an automatic call
Capped and preflighted
8 images a run, 4MB ceiling, raster formats only, bot blocks and logins skipped before billing
Copy all, or CSV
Every row as image URL and alt, or the full table with finding, flags and link destination
Generated kept apart
The vision model is named and its block drawn in its own colour
What this reads, and what it cannot
Frequently asked questions
What is a bulk alt text generator?
A tool that reads every image on a page, works out which need a description, and writes one for those. This one runs the Image Alt Checker's scan first, sends only images with no alt or in an unnamed link to a vision model, and checks each description against the checker's own rules.
Why does it not write alt text for every image?
Because most images on most pages should not have any. A decorative image marked alt="" is correct markup, and an image with a usable description already is finished. Writing over either would be paying to make the page worse. The tool writes where the checker found an error and nowhere else.
What happens to images with useless alt text?
Filenames, DSC_0431, "image of..." and duplicates are listed with a rewrite button each. They are not rewritten automatically because each one is a billed call and the checker's warning may be wrong about a specific image. You decide, one image at a time.
How does it handle an image that is the whole of a link?
It names the destination rather than describing the picture. When an image is the only content of a link, its alt text becomes the link's accessible name, so a logo linking home should say where it goes. The link's URL is put in front of the model for exactly that reason.
Are the descriptions checked?
Yes, by the same code the checker uses. Each one is tested for the 125 character ceiling, the redundant "image of" prefix, and a filename-shaped answer, and any failure is shown beside it. A generator that hands you alt the checker would flag next week is not much of a generator.
Why is it capped at 8 images a run?
Every image is a separate vision call, which is the most expensive thing any free tool on this site does. The cap keeps a single run affordable and stops a 300-image page from becoming a bill. If more images qualify, the page says so, and running it again takes the next batch.
Which images are skipped before the model sees them?
Anything the image server refuses to a bot, anything behind a login, anything over 4MB, and any format the vision model does not read, such as SVG or AVIF. Each skipped row says why, so a skip is a fact about the image rather than a silent gap.
Which part is AI and which is measured?
The scan, the classification, the caps and the checks are code and would come out the same on a second run. The descriptions are a vision model's, drawn in their own colour with the model named. The two are kept apart so you always know which kind of claim you are reading.
Why is there a daily AI limit?
Because every run bills real model calls, which the fetch-only tools never do. AI runs are limited per day on top of the ordinary tool limit. Asking for the same images again is served from cache and does not spend a run.
Does alt text help SEO?
It is how image search understands a picture and how a crawler reads an image-only link, so missing alt is a real if modest ranking gap. The larger point is accessibility: a screen reader user gets nothing from an undescribed image and reads a raw URL for an unnamed link.
Should I paste the generated alt text straight in?
Read it first. A model can name a photo accurately and still miss what the image is for on your page, which is the thing alt text should say. Treat each description as a draft that is already the right length and shape, and edit the ones where purpose and picture differ.
Can I export the results?
Yes. Copy all gives every row as image URL, tab, alt, ready to paste into a sheet. The CSV adds the checker's finding, the current alt, the character count, any flags on the new description, and the link destination for image-only links.
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Read guideTerms this tool checks
- Alt Text (Alternative Text)
Alt text (alternative text) is an HTML attribute added to image tags that describes the content and function of an image.
- Image Optimization
Image optimization is the process of reducing image file sizes and improving delivery without sacrificing visual quality.
- E-E-A-T
E-E-A-T stands for Experience, Expertise, Authoritativeness, and Trustworthiness.
Alt text for one page, or the 340 pages sharing the same gap
The generator writes descriptions for the images on one page. It cannot tell you that the same template leaves the same image undescribed on every product page, or which of those pages earns image-search impressions. CrawlRaven joins a technical crawl with GSC and GA4 into one plan: what to fix first, ranked by the traffic behind it.