Markdown Formatter
Paste messy Markdown and get back a tidy, consistently formatted version — aligned tables, uniform list markers, and clean whitespace, powered by Prettier, entirely in your browser.
Runs entirely in your browser — files never leave your device.
Formatting runs entirely in your browser via the open-source Prettier library — nothing is uploaded. "Wrap" controls how long lines of prose are (re)wrapped; "Indent" controls the space width used for nested lists.
How it works
- 01Paste or type Markdown into the left pane, upload a .md file, or use "Open from URL" to load one from the web.
- 02Optionally adjust "Wrap" (how long prose lines are re-wrapped) and "Indent" (spaces used for nested lists).
- 03Click "Format" to run Prettier's markdown formatter — the tidied result appears in the right pane.
- 04Copy the result or download it as a .md file. Everything runs client-side — your Markdown never leaves the browser.
Frequently asked questions
What does this formatter actually fix?
It normalizes whitespace, aligns table columns, standardizes list markers and indentation, and applies other consistent Markdown style rules — using Prettier's official markdown parser/printer, the same engine used to format Markdown in many code editors.
What does "Wrap" (proseWrap) mean?
It controls how paragraph text is line-wrapped. "Preserve" (default) keeps your existing line breaks as-is. "Always" re-wraps prose to a fixed width. "Never" collapses each paragraph onto a single line. This only affects prose text, not code blocks, tables, or lists.
Will this change my code blocks or tables?
Code block contents are left untouched. Tables are reformatted for readability (columns aligned with padding) but the cell content itself is not altered.
Does my Markdown get uploaded to a server?
No. Formatting runs entirely in your browser using the open-source Prettier library — nothing is sent over the network (unless you use "Open from URL" to fetch a remote file, which is a direct browser request, not a server relay).
Can I format Markdown while editing in the Markdown Editor?
Yes — the Markdown Editor (/editor) has its own "Format" button that runs the same Prettier-based formatter directly on your draft, in place.