Skip to content

Alt Text Checker for Pasted HTML

Check your images for missing, empty, or generic alt text that hurts accessibility and SEO.

Runs entirely in your browser — your files are never uploaded to a server.

Last updated

This tool processes your input entirely in your browser. Nothing is sent to our servers.

How It Works

1. Choose Your File

Drag & drop or select the file you want to work with.

2. Processed in Your Browser

Everything happens locally on your device — your file is never uploaded anywhere.

3. Download Your Result

Get your finished file instantly, ready to save or share.

About Alt Text Checker for Pasted HTML

Scans a page for images missing alt text — the descriptive text attribute that describes an image for screen readers and for search engines, which can’t otherwise interpret what an image actually shows.

Missing alt text is both an accessibility gap (screen reader users get no information about the image) and a missed SEO opportunity (search engines have no textual context for that image at all).

Good alt text describes what’s actually in the image concisely and specifically — “chart showing quarterly revenue growth” is meaningfully more useful than “chart” or a blank attribute, for both purposes.

Frequently Asked Questions

How to check alt text?

Paste your page's HTML into the box and click Check Alt Text. The tool lists every image tag with a status: Missing when there is no alt attribute, Empty for alt with no text, Generic for filenames or placeholder words, and Good otherwise.

How to check alt text on a website?

This tool does not crawl sites, so get the HTML first. Open the page, press Ctrl+U (Cmd+Option+U on Mac) to view source, copy it and paste it above. For images added by JavaScript, copy the rendered HTML from Inspect instead.

How to test alt text?

This checker finds missing, empty and filename-like alt text, but it cannot judge whether a description is accurate. To test quality, read the alt text aloud as if the image were absent, or try a screen reader such as NVDA or VoiceOver.

What should alt text include?

Describe what the image shows and why it matters in the context of the page, in a short natural phrase. Skip words like image of or photo of. Purely decorative images should use an empty alt attribute, which this tool reports as Empty so you can confirm.

Robots.txt File Generator Generate a robots.txt file to control which parts of your site search engine crawlers can access. SEO Tools Use Now → Meta Tag Generator for SEO Generate ready-to-paste HTML meta tags — title, description, Open Graph, and Twitter Card — from one form. SEO Tools Use Now → UTM Builder for Campaign Links Build campaign tracking URLs with UTM parameters for accurate marketing analytics. SEO Tools Use Now → URL Slug Generator Convert any text into a clean, URL-friendly slug — with separator and stop-word options. SEO Tools Use Now → Open Graph Preview Tool Preview how your page will look when shared on Facebook, Twitter/X, LinkedIn, and other social platforms. SEO Tools Use Now → Heading Checker for Pasted HTML Check your page's H1-H6 heading hierarchy for SEO and accessibility issues like missing H1s or skipped levels. SEO Tools Use Now →