GitHub README Link Checker: 5 Markdown Mistakes That Break Docs

Your README is often the first product surface users see. If installation, docs, or contribution links fail, trust drops immediately. For most teams, a lightweight GitHub README link checker catches issues faster than manual review.

1. Wrong Relative Paths

Markdown links that work locally can fail in forks, mirrors, or package indexes. Normalize paths and avoid brittle assumptions about current folder context.

2. Hardcoded Branch Names

Links pointing to master break after migrations to main. Prefer relative links or dynamic default-branch references when possible.

3. Case-Sensitivity Mismatch

A file named setup.md will not match Setup.md on Linux-backed systems. This is one of the most common markdown dead link checker findings.

4. Broken Heading Anchors

Renaming headings silently breaks #anchors. Users stay on top of page and think the docs are incomplete.

5. Expired Community Links

Slack/Discord invites expire and break onboarding funnels. Replace with permanent invite URLs and test quarterly.