GitHub README Files
Verify installation guides, badges, documentation links, and project resources.
Markdown Link Checker
Check Markdown links for common issues before publishing. Detect empty URLs, duplicate links, missing protocols, invalid Markdown link syntax, and internal anchor links in README files, documentation, and Markdown documents.
- Free
- Browser-based
- No signup
- Private
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What Is a Markdown Link Checker?
A Markdown Link Checker analyzes the links in your Markdown document and helps you identify common problems before you publish. Instead of manually reviewing every link, it scans your content and reports issues such as empty URLs, duplicate links, missing protocols, invalid Markdown syntax, and internal anchor links.
Whether you're maintaining a GitHub README, writing technical documentation, publishing tutorials, or updating a knowledge base, checking your links helps ensure readers can navigate your content without encountering avoidable errors.
Unlike live website validators, this tool focuses on the structure and syntax of your Markdown links. It reviews how links are written, making it fast, private, and suitable for checking Markdown files directly in your browser.
What Does This Tool Check?
The checker scans your Markdown document and analyzes every supported link type, helping you quickly identify formatting mistakes and navigation issues.
Empty Links — Detects links that don't contain a destination URL.
Missing Protocols — Flags external links that should include
https:// or http://.Duplicate URLs — Finds repeated links that may be unnecessary.
Invalid URL Formatting — Identifies malformed absolute URLs that do not parse correctly.
Internal Anchor Links — Lists links pointing to headings within the document.
Relative File Links — Detects links to local Markdown files and folders.
Image Links — Reviews image URLs separately from regular hyperlinks.
Reference Links — Resolves reference-style Markdown links when definitions exist.
Types of Markdown Links Supported
The tool recognizes the most common Markdown link formats used across GitHub, documentation platforms, static site generators, and Markdown editors.
Inline Links — ✅
Reference-style Links — ✅
Autolinks (`<https://...>`) — ✅
Image Links — ✅
Internal Heading Anchors — ✅
Relative File Links — ✅
Root-relative Paths — ✅
Mailto Autolinks (`<mailto:...>`) — ✅
This ensures you can validate almost every link type commonly found in README files, technical documentation, project wikis, and Markdown-based websites.
Common Link Problems This Tool Finds
Even experienced Markdown users occasionally overlook link issues. This checker helps you identify the most common problems before publishing your document.
Empty Link — Example:
[Documentation](). Readers have nowhere to navigate.Missing Protocol — Example:
example.com/docs. External links should usually include https://.Duplicate URL — The same destination repeated multiple times can make documentation harder to maintain.
Invalid URL Formatting — Malformed absolute URLs may be flagged when the destination does not parse correctly.
Internal Anchor Links — Example:
[Setup](#installation). Review anchor links when headings are renamed or reorganized.Relative File Links — Example:
./docs/setup.md. Verify paths after files are moved or renamed.Image URL Issues — Example:
 with an incorrect path. Images may fail to display if the URL is wrong.Finding these issues before publishing helps create more reliable documentation and improves the reader experience.
Link Validation Report
After scanning your Markdown document, the tool provides a summary of every detected link along with potential issues.
Total Links — All Markdown links found in the document.
Links With Issues — Links that require attention before publishing.
External Links — URLs pointing to websites outside the current document.
Internal Links — Heading anchors, relative files, and internal references.
Duplicate URLs — Repeated destinations that appear more than once.
Reviewing this report makes it easy to locate formatting problems and understand the overall quality of your Markdown links without manually inspecting every URL.
Why Markdown Link Validation Matters
Broken or incorrect links can make documentation frustrating to use. A single empty URL or outdated anchor can prevent readers from accessing important information.
Running a quick link check before publishing helps you catch formatting mistakes early.
Running a quick link check before publishing helps you improve navigation in README files and documentation.
Running a quick link check before publishing helps you reduce maintenance caused by outdated links.
Running a quick link check before publishing helps you keep internal references accurate as documents grow.
Running a quick link check before publishing helps you publish cleaner, more professional Markdown.
Instead of reviewing every link manually, you can identify potential problems in seconds.
Markdown Link Checker vs Manual Review
You can review links by reading through your Markdown document, but this becomes time-consuming as files grow larger. A Markdown Link Checker automates the process, helping you spot common issues in seconds.
| Feature | Manual Review | Markdown Link Checker |
|---|---|---|
| Review every Markdown link | Manual | ✅ Automatic |
| Detect empty URLs | Easy to miss | ✅ |
| Find duplicate links | Manual | ✅ |
| Separate internal and external links | Manual | ✅ |
| Identify missing protocols | Manual | ✅ |
| Check reference-style links | Manual | ✅ |
| Scan large Markdown files | Slow | ✅ Fast |
For short notes with only a few links, manual checking may be sufficient. For GitHub README files, technical documentation, knowledge bases, and larger Markdown projects, an automated checker is much faster and more reliable.
Common Use Cases
Markdown Link Checker is useful anywhere Markdown documents contain hyperlinks.
Technical Documentation
Check API references, setup guides, and developer documentation before publishing.
Documentation Websites
Review internal navigation across Markdown pages used by static site generators.
Knowledge Bases
Keep internal documentation accurate and easy to navigate.
Project Wikis
Validate links before sharing documentation with your team.
Personal Notes
Organize long Markdown notes and ensure references remain valid.
AI-Generated Markdown
Review links created by ChatGPT, Claude, Gemini, or Copilot before publishing.
Best Practices for Markdown Links
Well-organized links improve navigation and make Markdown documents easier to maintain over time.
Use descriptive link text
Instead of generic text like "Click here", use descriptive labels that tell readers where the link leads. Good example: [Installation Guide](https://example.com/install).
Always include the full protocol
For external websites, include https:// whenever possible. This avoids malformed links and improves compatibility across Markdown platforms.
Keep internal anchors updated
If you rename or reorganize headings, review your anchor links to ensure they still point to the correct section.
Remove unnecessary duplicate links
Using the same URL multiple times isn't always wrong, but reducing unnecessary duplicates keeps documentation cleaner and easier to update.
Check image URLs
Markdown images also use links. Verify that image paths remain valid after moving files or reorganizing folders.
Review links before publishing
A quick validation before publishing helps catch small mistakes that are easy to overlook during editing, especially in long documentation projects.
How to Check Markdown Links
Checking your Markdown links only takes a few seconds.
Paste or upload your Markdown
Paste your Markdown document into the editor or upload a supported
.md,.markdown, or.txtfile.Scan your links
Click Check links to analyze every Markdown link in your document. The tool identifies internal links, external URLs, image links, anchor links, and reference-style links while highlighting common formatting issues.
Review the report
Check the validation report for empty URLs, duplicate links, missing protocols, invalid syntax, and other potential issues. Make any necessary corrections before publishing.
Publish with confidence
Once you've resolved the reported issues, your Markdown document is ready to share on GitHub, documentation websites, project wikis, blogs, or knowledge bases.
Why Use This Markdown Link Checker?
There are many general-purpose URL checkers, but they're not designed for Markdown. This tool understands Markdown syntax and focuses on the link issues that matter most when working with README files and documentation.
Built for Markdown
Understands Markdown link syntax, including inline links, reference links, image links, anchor links, and relative paths.
Instant Validation
Analyze your Markdown in seconds without manually inspecting every URL.
Better Documentation Quality
Identify formatting mistakes before readers encounter broken navigation or confusing links.
Organized Link Reports
Separate internal links, external URLs, duplicate links, and detected issues into an easy-to-review report.
Works Across Markdown Workflows
Use it for GitHub README files, technical documentation, API documentation, project wikis, static site generators, knowledge bases, Markdown blogs, and personal notes.
Private and Secure
Everything runs directly in your browser. Your Markdown content is never uploaded, stored, or shared.
Frequently Asked Questions
- 1
What is a Markdown Link Checker?
A Markdown Link Checker analyzes Markdown links and identifies common issues such as empty URLs, duplicate links, missing protocols, invalid syntax, and internal anchor links.
- 2
Does this tool check whether websites are online?
No. This tool validates Markdown link syntax and structure. It does not perform live HTTP requests or verify whether external websites return a successful response.
- 3
Can I check links in a GitHub README?
Yes. Simply paste your README into the editor to review all Markdown links before publishing.
- 4
Does it support internal anchor links?
Yes. The tool detects heading anchors, relative paths, reference-style links, and other common Markdown link types.
- 5
Will this tool modify my Markdown?
No. Your original Markdown content remains unchanged. The tool only analyzes your links and reports potential issues.
- 6
Is my Markdown private?
Yes. Everything is processed locally in your browser, so your content is never uploaded or stored.
Related Tools
Working with Markdown documentation? These tools pair well with the Markdown Link Checker.
Last updated: Category: Markdown Utilities