Are NanoTools completely free to use?

Yes, all basic tools on NanoTools are completely free to use with no registration required. We offer premium features for power users.

Is my data secure when using NanoTools?

Your files are processed securely and are automatically deleted after processing. We do not store your files or data on our servers.

Do I need to install any software to use NanoTools?

No installation required. All tools work directly in your browser on any device - computer, tablet, or smartphone.

What file formats are supported?

We support a wide range of formats including PDF, JPG, PNG, WebP, GIF, JSON, XML, CSV, and many more depending on the tool.

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Markdown Link Validator - Check Broken Links

Validate Markdown links online for free. Check for broken links in Markdown files. Fix dead links.

Paste Markdown Content

About Link Validation

What does this tool check?

Validates markdown link format: [text](url)
Checks URL format and structure
Identifies relative links, anchors, and email links
Flags malformed or invalid URLs

Limitations

Does not check if URLs are actually reachable (would require server-side validation)
Relative links cannot be validated without context
Anchor links (#section) are marked as warnings

Privacy Note: All validation is performed locally in your browser. Your markdown content is never sent to any server.

What This Tool Does

Scans Markdown files for all links
Checks HTTP status of external URLs
Validates internal file references
Reports broken links and redirects
Provides detailed error messages

How to Use

1
Upload Markdown file
Select .md file to validate links
2
Start validation
Click validate to check all links
3
Review results
See which links are working, broken, or redirecting
4
Fix broken links
Update your Markdown based on validation report

How it works

Upload Markdown file

Select .md file to validate links

Start validation

Click validate to check all links

Review results

See which links are working, broken, or redirecting

Fix broken links

Update your Markdown based on validation report

Use Cases

Maintaining README files in GitHub repositories
Validating documentation before publishing
Checking blog post links before posting
Auditing internal wiki links
Quality assurance for technical documentation

Frequently Asked Questions

What types of links are checked?

HTTP/HTTPS URLs, internal file references, and anchor links within documents.

How long does validation take?

Depends on number of links. External URLs require HTTP requests which take time.

Can it fix links automatically?

No, it reports issues. You need to manually update the Markdown file.

Does it check image links?

Yes, validates both text links and image URLs in Markdown.