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Text Processing

Markdown Lint and Style Checker

· Last updated：2026-06-21

Lint Markdown against ~15 markdownlint rules plus 2 Chinese-typography rules, with line-located reports and one-click auto-fix of safe issues

Details

What this tool helps you do

Tokenizes Markdown into blocks and runs a markdownlint-inspired rule engine (MD001/004/009/012/013/022/024/025/029/031/032/040/041/042/045/047) plus Chinese-typography rules (CN001 space between Chinese and Latin/digits). Reports each issue with its line, rule ID, severity, and a fix hint. Auto-fix applies only safe deterministic fixes (trailing whitespace, blank lines, list markers, trailing newline). Three rule sets: Default, Strict, Lenient.

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Written by the Elysia Tools team
Text311
Text Processing185
Markdown40

Tool usage guide

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

Key facts

Category
Text Processing
Input types
textarea, select, checkbox
Output type
html
Sample coverage
4
API ready
Yes

Overview

The Markdown Lint and Style Checker helps you validate and clean up your Markdown documents by scanning them against 15 standard markdownlint rules and Chinese-typography spacing guidelines. It provides line-by-line issue reports and offers a safe, one-click auto-fix for common formatting errors like trailing whitespaces, inconsistent list markers, and missing blank lines.

When to use

  • Before publishing documentation, README files, or blog posts to ensure consistent formatting and style.
  • When editing mixed-language documents containing both Chinese and English/digits to automatically fix spacing issues.
  • To quickly clean up messy Markdown files by automatically fixing trailing whitespaces, consecutive blank lines, and missing list markers.

How it works

  1. 1Paste your Markdown content into the text area and select your preferred rule set (Default, Strict, or Lenient).
  2. 2Enable the auto-fix option if you want the tool to automatically resolve safe, deterministic formatting issues.
  3. 3Review the generated report highlighting specific rule violations, line numbers, severity levels, and suggested fixes.

Use cases

  • Standardizing project README files before committing them to version control repositories.
  • Polishing technical documentation to ensure correct heading hierarchies and code block formatting.
  • Formatting bilingual Chinese-English articles to automatically insert proper spacing between different character sets.

Examples

1. Standardizing a Project README

Technical Writer

Background

A technical writer is preparing a project README that has inconsistent list markers, trailing whitespaces, and missing code block languages.

Problem

The document looks messy, violates standard Markdown guidelines, and lacks consistent formatting.

How to use

Paste the README content into the Markdown input, select the 'Default' rule set, check 'Auto-fix safe issues', and run the checker.

Rule Set: Default, Auto-fix: Enabled

Outcome

Trailing whitespaces are removed, list markers are unified to dashes, and a report highlights the missing code block language on line 8.

2. Fixing Bilingual Spacing in Documentation

Localization Engineer

Background

An engineer is translating documentation into Chinese and needs to ensure proper spacing between Chinese characters and English terms or numbers.

Problem

The translated text lacks spaces between Chinese and Latin characters (e.g., '使用Python3'), violating typography standards.

How to use

Input the translated Markdown text, select the 'Default' rule set, and run the lint check.

FAQ

What rules does the Markdown Lint and Style Checker validate?

It checks ~15 standard markdownlint rules (like heading levels, list markers, and code fences) and Chinese-typography rules (like spacing between Chinese and Latin characters).

What issues can the auto-fix feature safely resolve?

It automatically fixes trailing whitespaces, consecutive blank lines, inconsistent list markers, missing blank lines around headers/lists, and missing trailing newlines.

What is the difference between the Default, Strict, and Lenient rule sets?

Default checks standard rules; Strict adds strict line length (MD013) and ordered list prefix checks; Lenient suppresses style warnings to focus only on errors.

Does the tool modify my original Markdown structure or content?

No, it only fixes safe formatting issues. Structural issues like skipped heading levels or missing code block languages are reported for manual correction.

How does the Chinese-typography rule (CN001) work?

It detects and flags missing spaces between Chinese characters and Latin characters or digits, helping you maintain clean, readable bilingual text.

Hub

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Review stock-phrase and repetition findings in an English or Chinese Markdown draft, protect facts and quotations, reconcile revisions and links, and deliver an approved source with a review ledger.

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Turn selected RSS and Atom feeds into a reviewed weekly digest with explicit dates, cross-source deduplication, traceable summaries and verified HTML or PDF delivery.

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Release Notes Review and Website, Slack, and PDF Delivery

Review one release against its changelog, validate version syntax and Markdown references, then prepare consistent website, Slack, and PDF release notes.

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Editorial Copy Review and Brand Voice

Review an existing draft for brand voice, titles, readability, typography, whitespace, and Markdown quality without flattening the author's intent.

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Rule Set: Default, Auto-fix: Enabled

Outcome

The tool flags the spacing issues and automatically inserts spaces to format the text correctly as '使用 Python 3'.