Source versus preview
The left side remains plain Markdown source; the preview shows how headings, lists, links, tables, code, and emphasis render.
Developer Tools · Local processing
Markdown Previewer
Preview GitHub-flavored Markdown through sanitized local HTML.
GFM + sanitized HTML
Markdown Previewer
Inputs and results stay in this page and are not sent to any server.
The practical guide
Edit Markdown and review the rendered result side by side.
The preview supports common GitHub-flavored Markdown features, then sanitizes the generated HTML before it enters the document.
GitHub-flavored features
Tables, task-list style syntax, fenced code, and other supported GFM constructs can be reviewed without sending drafts to a hosted editor.
Unsafe HTML is removed
Sanitization strips scripts and unsafe markup. The preview is for rendering and editing, not for running embedded web applications.
Privacy by architecture
Your files and tool inputs stay in your browser.
The selected files, inputs, settings, and outputs are processed in this page and are not uploaded to any server.
Questions, answered
Frequently asked questions
Can scripts inside Markdown run?
No. Generated HTML is sanitized before rendering.
Does the preview exactly match GitHub?
It follows GitHub-flavored Markdown syntax, but styling and every edge case may differ from GitHub itself.
Can I download the rendered HTML?
The current workflow focuses on local source editing and live preview; use the controls actually shown by the tool for available output.
Is the Markdown saved?
No. The tool does not store drafts after you leave the page.