Smart heuristics that add Markdown structure to plain text — headings, lists, URLs, paragraphs.
Free Plain Text to Markdown Converter turns unstructured text into clean Markdown using pattern heuristics. ALL-CAPS lines become headings, bullet-like lines become list items, numbered lines become ordered lists, URLs become autolinks, and paragraph breaks are preserved. No NLP, no LLM — just shape detection on the text you already have.
Privacy: This tool runs entirely in your browser. Your text is never uploaded, logged, or cached. Close the tab and it's gone. Verify in DevTools → Network: zero requests fire.
Converting an old txt README or a raw blog draft into Markdown shouldn't take 20 minutes of manual formatting. One ad pays for hosting, the heuristics run 100% in your browser, and you never need to upload a file.
| Input | Output | Typical size | Speed | Login needed |
|---|---|---|---|---|
| Plain text (.txt) | Markdown (.md) | Any document size | < 20 ms | No |
Here's what this free tool does in detail — every feature is built to solve real problems, runs entirely in your browser, and is free forever.
Short lines written in ALL CAPS (like INSTALLATION or REQUIREMENTS) are a strong signal of a heading in ASCII-era docs, RFCs, and old READMEs. The tool detects lines of 3–60 characters that are entirely uppercase letters (with optional digits, spaces, colons, and parentheses) and rewrites them as H2 headings with sentence-case text. Toggle off if your text uses caps for emphasis instead.
For converting the other direction, use the Free Markdown to Plain Text tool.
Lines starting with -, *, •, or · become Markdown bullet list items. Lines starting with 1. or 2) become ordered list items with their original numbering preserved. Adjacent list lines are grouped into a single list block so the output renders correctly in any renderer.
To format an existing Markdown document, use the Free Markdown Formatter.
Plain URLs like https://example.com/page become <https://example.com/page> autolinks that render as clickable in every Markdown renderer. Email addresses are detected separately and kept as plain text by default (to avoid rewriting addresses that appear in code samples); toggle Linkify emails to convert them to mailto: autolinks.
Blank lines are preserved as paragraph separators. Single newlines inside a paragraph — which often appear as hard-wrapped text in old documents — are collapsed into single spaces by default so paragraphs reflow naturally. Toggle off if your source uses intentional line breaks (poetry, code, addresses) that must be preserved.
Once converted, render the result to HTML with the Free Markdown to HTML tool.
Drop in a README.txt, a blog draft, an old doc, or any unformatted block.
Enable or disable caps-as-headings, list detection, URL linkification, and email handling.
Click Copy Markdown and paste into your editor, GitHub repo, or blog.
Turn an ancient README.txt into a proper README.md in seconds.
Draft in a plain-text editor, convert once, publish to any Markdown blog.
Turn a typed paper into Markdown for submission or note-taking.
Migrate plain text technical docs into a Markdown-based knowledge base.
Import text from a PDF or Word export and add Markdown structure with one paste.
Yes. Free forever, no account required.
ALL-CAPS headings, bullet and numbered lists, URL and email linkification, paragraph detection, and horizontal rules.
Yes. Each heuristic has its own toggle, so you can enable only what you want.
No. Only pattern detection — no NLP, no LLM, no network calls.
No. Runs 100% in your browser.