Find images with missing alt text, empty URLs, localhost paths, oversized data URIs, and invalid syntax.
Paste Markdown with images to scan them.
Free Markdown Dead Image Detector scans every image reference in your document for missing alt text, empty URLs, invalid syntax, localhost paths, and oversized data URIs. No HTTP requests are made -- the analysis is instant and runs entirely in your browser.
Privacy: This tool runs entirely in your browser. Your text is never uploaded, logged, or cached. Close the tab and it's gone. Verify in DevTools → Network: zero requests fire.
Broken images make docs look unprofessional. Catching them shouldn't require a paid service. The scanner runs 100% client-side.
| Input | Output | Typical size | Speed | Login needed |
|---|---|---|---|---|
| Markdown (.md) | Issue report | Any document size | < 10 ms | No |
Here's what this free tool does in detail — every feature is built to solve real problems, runs entirely in your browser, and is free forever.
Images without alt text break accessibility for screen reader users and hurt SEO. The detector flags every  with an empty alt attribute as a warning so you can add descriptive text.
For checking link references, see the Broken Link Finder.
Empty image URLs, malformed URLs (spaces, missing protocol), and localhost references are all caught. These are the most common causes of broken images in production documentation.
Inline images encoded as base64 data URIs work but bloat file size. The detector flags data URIs larger than 5KB as informational, suggesting you host the image externally instead.
Need to extract images from your Markdown? Try the Image Extractor.
Click Copy report to get a formatted plaintext summary grouped by severity, with line numbers and image details. Paste it into a GitHub issue or PR review comment for easy triage.
Paste any Markdown document with images into the input, or click Load example.
The detector reports issues grouped by severity with line numbers and image details.
Click Copy report to get a plaintext summary for your issue tracker or PR.
Scan README and docs for broken image references before pushing a new version.
Find images with missing alt text and fix accessibility issues systematically.
Catch missing alt text and broken image URLs that hurt page quality.
Identify all images lacking descriptive alt text in one scan.
Verify that all image references survived the migration process.
Yes. Free forever, no account required.
Missing alt text, empty URLs, invalid syntax, localhost paths, extensionless relative paths, and oversized data URIs.
No. Structural analysis only. No HTTP requests are made.
Alt text is required for accessibility and SEO. Screen readers need it to describe images.
An inline image encoded as base64. Large ones bloat your file and are flagged when over 5KB.
No. Runs 100% in your browser.