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Tools

Markdown tools that just work

A free, open-source suite for editing, previewing, converting, and formatting Markdown. Everything runs in your browser — no signup, no upload, no watermark.

Edit & preview

Write and read Markdown in the browser.

Convert

Move between Markdown, HTML, and PDF.

Generate & clean up

Format messy documents and create snippets in seconds.

Analyze & extract

Counts, readable excerpts, and anchor IDs.

Advanced Markdown workflows

Diffs, structure audits, diagrams, releases, and multi-doc simulations.

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Markdown Diff Tool

Paste two Markdown revisions side by side and see added and removed lines with a unified-style highlight.

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Markdown Syntax Tutor

Short guided drills for headings, links, lists, code fences, and tables — check your answer against hint patterns.

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Markdown Redaction Helper

Heuristic redaction for emails, IPv4, bearer tokens, and common secret-shaped strings before sharing drafts.

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CSV / TSV ↔ Markdown Table

Turn delimiter-separated rows into GitHub-flavored pipe tables and extract CSV back out of Markdown tables.

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Mermaid Diagram Validator

Validate Mermaid diagram source with the official parser — instant pass/fail with line-level error messages. Catches syntax mistakes before they silently break GitHub or Docusaurus renders.

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Changelog & Release Notes Helper

Lightweight Keep-a-Changelog hints plus normalization of release headings into standard Added / Changed / Fixed sections.

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Markdown List Normalizer

Convert `*` and `+` unordered bullets to `-` while skipping fenced code blocks so snippets stay untouched.

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Heading Hierarchy Auditor

Flag heading jumps (for example h2 → h4), multiple top-level titles, and missing H1 scenarios.

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GFM Compliance Checklist

Quick pass over GitHub-flavored Markdown conventions: H1 count, fence languages, empty links, first table parse.

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Outline Reorder Mode

Split Markdown into heading-bound sections, reorder them with up/down controls, and copy the recombined document.

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Slug Collision Simulator

Paste several Markdown sources and see where GitHub-style heading IDs would collide across files or merged sites.

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Footnote Helper

Drop numbered reference markers at the cursor and append `[^n]:` definitions using the next free index.

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Markdown Emoji Picker

Filter common release-notes and README emoji, copy with one click for GitHub-flavored Markdown bodies.

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Merge & Split Markdown

Merge two Markdown files with a horizontal rule delimiter or split one document at ## / ### boundaries.

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Audit & quality

Link checking, image audits, MDX validation, and an aggregate README health score.

Author & publish

TOCs, frontmatter, callouts, reading time, badges, slides — the publishing toolkit.

Inventories & math

Curated copy-paste libraries of Mermaid diagrams and LaTeX equations, plus a live equation editor.

Document & file conversion

Convert between Markdown and Word, PDF, and live web pages — plus a hub that links every converter.

Data & structure

JSON, table manipulation, and code-block extraction for content pipelines.

Cross-format converters

Bridge Markdown to Confluence, BBCode, AsciiDoc, and reStructuredText.