I Built Markups: A Free, Open-Source Markdown Editor That Doesn't Need an Account

Description and use

Markups is a browser-based Markdown editor that opens instantly, requires no account, offers live preview, supports Mermaid diagrams, KaTeX math, and exports to Markdown, HTML, and PDF.

Problem

Developers often face friction when editing Markdown because many tools require accounts, cloud workspaces, or complex onboarding before they can write and preview documents.

Outcome

Markups eliminates onboarding friction, offers a developer-friendly editing experience with live preview, supports advanced Markdown features, and allows easy export to multiple formats, making it a practical tool for README editing, technical documentation, and architecture notes.

Workflow

• Open markups.dev in a browser
• Start writing Markdown in the Monaco-based editor
• View live preview side-by-side or in a single pane
• Use features like Mermaid diagrams, KaTeX math, syntax-highlighted code blocks, and linting
• Export the document as .md, HTML, or PDF
• Save or commit the file to a repository

Evidence

Open it. Write Markdown. See the result. Keep control of your document.

Source

Markups is an open-source, browser-based Markdown editor designed to make Markdown work feel simple again.

Source