Markdown Frontmatter Generator
Visual YAML, TOML, and JSON metadata builder for static site generators and documentation portals.
Core Post Metadata
Free Online Markdown Frontmatter Generator (YAML, TOML, JSON)
Generate clean, valid YAML, TOML, or JSON frontmatter headers for static site generators including Astro, Nextra, Hugo, Jekyll, Gatsby, and Obsidian. Automatically injects metadata at the top of your Markdown posts.
How to Use the Markdown Frontmatter Generator
Fill In Post Metadata
Enter your article title, description, publication date, author, tags, and draft state.
Choose Header Syntax
Select YAML (for Astro/Nextra/Jekyll), TOML (for Hugo), or structured JSON.
Copy or Download
Copy the frontmatter header or download the full assembled Markdown document.
Key Features & Capabilities
Pro Tips & Best Practices
- •Keep your slug short and lowercase with hyphens for the highest Google SEO crawlability.
Frequently Asked Questions
What is frontmatter in Markdown?
Frontmatter is a block of metadata defined at the very beginning of a Markdown file between delimiter lines (such as --- in YAML). Static site generators parse this block to configure page titles, SEO descriptions, tags, and layouts.
Which static site generators support YAML frontmatter?
Almost all modern SSGs support YAML frontmatter out of the box, including Astro, Nextra, Hugo, Jekyll, Docusaurus, Nuxt Content, Eleventy, and Obsidian notes.
Will this tool overwrite my existing document text?
No. If your document already contains an old frontmatter header, MarkdownKite safely replaces only the header block while preserving all of your article's body content.
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