What is YAML frontmatter?

Frontmatter is a block of YAML or TOML at the top of a Markdown file (between --- markers) that contains metadata like title, date, tags, and categories.

Which static site generators use frontmatter?

Jekyll, Hugo, Gatsby, Astro, Next.js, and many other Markdown-based systems use frontmatter for page metadata.

YAML Frontmatter Editor

Build and edit YAML or TOML frontmatter visually. Add fields like title, date, tags, and categories through a form, then copy the formatted frontmatter block.

Format:

YAMLTOML

Key

Type

Value

Key

Type

Value

Key

Type

Value

Key

Type

Value

Key

Type

Valuefalse

Output

---
title: ""
date: 2026-04-21
description: ""
tags: []
draft: false
---

Frequently Asked Questions

What is YAML frontmatter?: Frontmatter is a block of YAML or TOML at the top of a Markdown file (between --- markers) that contains metadata like title, date, tags, and categories.
Which static site generators use frontmatter?: Jekyll, Hugo, Gatsby, Astro, Next.js, and many other Markdown-based systems use frontmatter for page metadata.

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About YAML Frontmatter Editor

Visual editor for YAML/TOML frontmatter. Free online frontmatter builder for Jekyll, Hugo, and Astro. This tool runs entirely in your browser — no data is sent to any server. Your content stays private and secure. MarkdownMe provides free, fast, and reliable Markdown tools for developers, writers, and anyone who works with Markdown.