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Markdown Link Checker

· Last updated：2026-06-21

Statically check Markdown links for format errors, broken anchors, and undefined references (no network requests)

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Written by the Elysia Tools team
Markdown40

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category
Development
Input types
textarea, select
Output type
text
Sample coverage
4
API ready
Yes

Overview

The Markdown Link Checker is a static analysis tool designed to scan your Markdown documents for formatting errors, broken internal anchors, and undefined reference links without making any external network requests.

When to use

  • Before publishing documentation or blog posts to ensure all internal headers and reference links resolve correctly.
  • When refactoring large Markdown files and you need to verify that anchor links still match the updated headings.
  • During offline editing sessions where you want to validate link syntax and reference definitions without internet access.

How it works

  1. 1Paste your Markdown content into the input area.
  2. 2Select your preferred check level, choosing between basic validation or strict validation for unused references and duplicate anchors.
  3. 3Choose the output report format as either plain text or structured JSON.
  4. 4Run the check to instantly view a detailed report highlighting syntax errors, missing targets, or broken anchors.

Use cases

  • Validating README files and project documentation before committing changes to a repository.
  • Auditing long-form Markdown books or guides to clean up unused reference-style links.
  • Checking generated Markdown files from static site generators for broken internal cross-references.

Examples

1. Validating Documentation Anchors

Technical Writer

Background

A technical writer is updating a software user guide written in Markdown with numerous internal section links.

Problem

Several headings were renamed, potentially breaking internal links like [Setup Guide](#installation-setup).

How to use

Paste the Markdown text into the input, select 'Basic' check level, choose 'Text Report', and run the check.

Check Level: Basic, Report Format: Text

Outcome

The tool flags the exact line numbers where anchor links point to non-existent headings, allowing quick fixes.

2. Cleaning Up Reference-Style Links

Open Source Maintainer

Background

A maintainer is reviewing a large README file that uses reference-style links at the bottom of the document.

Problem

Over time, edits have left several unused link references and duplicate anchor definitions cluttering the file.

How to use

Paste the README content, select 'Strict' check level to catch unused references, and choose 'JSON' report format for automated parsing.

FAQ

Does this tool check external HTTP URLs to see if they are online?

No, this tool performs static analysis only and does not make network requests to verify external websites.

What is the difference between basic and strict check levels?

Basic level checks link formats and broken anchors, while strict level also flags unused reference definitions and duplicate anchors.

Can it detect broken internal section links (anchors)?

Yes, it parses headings to verify that internal anchor links like #section-name point to valid headings in the document.

What formats can I export the validation report in?

You can generate the validation report in either plain text format or structured JSON format.

Does my Markdown data get uploaded to a server?

No, the validation is performed entirely in your browser, keeping your document content private and secure.

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Check Level: Strict, Report Format: JSON

Outcome

The tool outputs a JSON report listing all unused reference definitions and duplicate anchors, making cleanup straightforward.