Question 1

Which markdownlint rules are implemented?

Accepted Answer

25+ rules: MD001 (heading-increment), MD003 (heading-style), MD004 (ul-style), MD005 (list-indent), MD007 (ul-indent), MD009 (trailing-spaces), MD010 (hard-tabs), MD012 (multiple-blanks), MD013 (line-length), MD018 (no-missing-space-atx), MD019 (no-multiple-space-atx), MD022 (blanks-around-headings), MD025 (single-h1), MD026 (no-trailing-punctuation), MD029 (ol-prefix), MD030 (list-marker-space), MD031 (blanks-around-fences), MD032 (blanks-around-lists), MD033 (no-inline-html), MD034 (no-bare-urls), MD035 (hr-style), MD039 (no-space-in-links), MD040 (fenced-code-language), MD041 (first-line-heading), MD047 (single-trailing-newline), MD058 (blanks-around-tables).

Question 2

Can the linter auto-fix violations?

Accepted Answer

Yes. Most rules are auto-fixable: trailing whitespace, hard tabs, multiple blanks, heading style normalization, list marker consistency, blank lines around blocks, fenced code language defaults, and a single trailing newline. The Fix button applies all safe fixes; rules that conflict (e.g., MD013 line-length vs content) are reported but not auto-broken.

Question 3

Are the rule names compatible with markdownlint config files?

Accepted Answer

Yes — every rule uses the canonical markdownlint ID (MD001, MD003, …). The default config mirrors the markdownlint recommended preset. You can toggle individual rules on/off and adjust parameters (line length, list marker, code fence style) in the UI; the active config is reflected in the shareable URL.

Question 4

Does this conflict with Prettier?

Accepted Answer

No. The formatter applies a Prettier-compatible preset that disables rules which would conflict with Prettier's output (MD013 line-length, MD033 no-inline-html, MD034 no-bare-urls are relaxed) so the cleaned output is stable under both tools. You can also re-enable any rule if you prefer stricter behavior.

Question 5

What extra features does this tool have compared to others?

Accepted Answer

(1) 25+ markdownlint-compatible rules with stable IDs. (2) Auto-fix for safe violations. (3) Per-rule toggle and parameter editor. (4) Line-precise violation list with fixable markers. (5) Configurable line length, list marker, heading style, code fence style, emphasis style. (6) Prettier-reconciled preset. (7) Copy / download (.md) / shareable URL with config. (8) History of recent lints (localStorage, max 20). (9) Stats: total violations, fixable count, by-rule breakdown. (10) Sample messy document loader. (11) Inline-disable comment helper (HTML comment). (12) Pure-JS — no Worker, no install, no upload. 100% client-side.

Markdown Linter & Formatter

How to use