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To convert a web page to Markdown, separate the job into three steps: fetch the page, isolate the content you want, then convert its HTML structure. A converter such as Turndown can serialize HTML you already have, but that alone does not guarantee it will find an article inside a live website. If the page depends on client-side JavaScript, you may also need a browser-rendering step before conversion.
Choose the right workflow for your input
| Approach | Best fit | What to account for |
|---|---|---|
| Turndown (JavaScript) | Convert an HTML string or DOM node in a JavaScript application. | You must fetch the page and select relevant content separately. Turndown supports configurable conversion rules; its documentation does not establish comparative output-quality results. |
| Microsoft MarkItDown (Python or CLI) | Convert HTML as part of a Python workflow that may also handle other document formats. | It targets Markdown for text analysis and may not be the best fit for high-fidelity, human-facing conversion. Its current README lists HTML support and CLI/Python usage. |
| Hosted URL conversion API | Send a public URL to a managed service for fetching and conversion. | Check authentication, account terms, credit use, rendering behavior, and whether longer jobs finish asynchronously. Capabilities and prices are vendor-specific and can change. |
These are workflow distinctions, not a universal quality ranking. Pick based on whether you already have HTML, your runtime, and whether the target page needs browser rendering.
Fetch the page and isolate the content
If you start with a URL, decide whether a regular HTTP request can retrieve the content or whether the page needs JavaScript to render it. A normal fetch retrieves the server response; it does not execute the page’s client-side scripts. A browser-rendered fetch can expose content that appears only after scripts run, but it adds browser setup and resource costs.
Next, select the part you actually want to convert. A page’s HTML often includes navigation, cookie notices, related links, and footer content alongside the main article. HTML-to-Markdown conversion serializes the HTML it receives; do not assume that it reliably identifies the article body on arbitrary sites. Test representative pages from the site you need to process and use an appropriate selector or extraction step.
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For hosted URL conversion, markitdown.ai documents a POST /v1/convert/url endpoint and render modes named auto, force, and skip. Its documentation says auto renders when fetched HTML has no readable content. That behavior is specific to that service, not a general feature of Markdown converters. The service documents API-key authentication, active-subscription requirements for conversion requests, and synchronous or asynchronous completion with polling or webhooks; confirm its current setup and terms in its URL conversion documentation and API overview.
Convert HTML with Turndown in JavaScript
Use Turndown when your JavaScript code already has the HTML or a DOM node you want to serialize. Install the package:
npm install turndownThen pass it an HTML fragment or a selected element’s HTML:
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const TurndownService = require('turndown');
const turndown = new TurndownService();
const html = '<h1>Example page</h1><p>Text with a <a href="https://example.com">link</a>.</p>';
const markdown = turndown.turndown(html);
console.log(markdown);For a DOM node in a browser environment, pass the node directly, or pass its HTML where you run Turndown:
const article = document.querySelector('article');
if (!article) throw new Error('Article element not found');
const markdown = turndown.turndown(article);
console.log(markdown);Use Turndown’s rules and options when you need to adjust how particular HTML elements serialize. The package documentation describes it as an HTML-to-Markdown converter with configurable rules; it does not claim automatic, reliable main-article extraction for every site. See the Turndown documentation for current installation and configuration details.
Convert HTML with Microsoft MarkItDown in Python
MarkItDown is a Python option when HTML conversion sits alongside other document-to-Markdown work. Its repository recommends using a virtual environment and currently lists Python 3.10 through 3.14; check the current README before installing because supported versions may change.
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Install the package with the documented all-formats extra:
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Convert a local HTML file from the command line and save the output:
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markitdown input.html > output.md -
For Python code, use the package’s MarkItDown interface with an input file or supported stream, then write the returned Markdown to your chosen destination. Consult the repository README for the current API pattern and input options.
MarkItDown describes its focus as preserving document structure for text analysis, and notes it may not be ideal for high-fidelity human-facing conversion. Treat the generated Markdown as a starting point when presentation fidelity matters.
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If your immediate need is a screenshot rather than Markdown, ScreenshotNeo takes a URL in one request and returns an image or PDF. It is not an HTML-to-Markdown converter, so it does not replace the extraction-and-conversion workflow above. Its API can be useful when you need a visual capture of a rendered page instead.
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For example, request a WebP screenshot of a page with cURL:
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Review and troubleshoot the Markdown
Conversion is not complete until you compare the result with the original page. Structural preservation is a stated goal of the documented tools, not a guarantee of perfect or lossless conversion; no comparative accuracy measurement is established by their documentation.
- Navigation or footer overwhelms the output: the converter received too much page HTML. Select the main content element before conversion, or add a site-appropriate extraction step.
- Content is missing from a JavaScript-heavy page: a basic HTTP fetch may not include rendered content. Use a browser-rendering stage or a hosted service whose documented render behavior meets your needs.
- Headings, lists, tables, code, images, or links look wrong: compare the Markdown structure and targets with the source HTML. Adjust conversion rules or handle complex structures explicitly; Markdown cannot represent every visual layout faithfully.
- Relative links or image paths break: conversion may preserve relative URLs without resolving them. Resolve them against the source page’s base URL when your downstream use requires absolute links.
- The CLI or package interface differs from an older example: check the current package README for supported Python versions, installation extras, and usage because package interfaces can change.
- A hosted request does not finish in one response: the service may return an asynchronous job. Follow its documented polling or webhook flow and verify current account and credit requirements.
Secure server-side conversion
Treat URLs and files submitted to a server-side converter as untrusted input. Microsoft warns that MarkItDown performs I/O using the current process’s privileges. Validate inputs, restrict permitted URL schemes and destinations, block access to private or metadata-service addresses where appropriate, and run conversion with only the permissions it needs. These are safeguards to apply as part of a broader security review, not a complete security guarantee.
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Quick Recap
Quality-check each conversion
- Confirm the heading hierarchy and reading order.
- Check that lists, code blocks, tables, and emphasized text retain their meaning.
- Verify links and image references, including whether relative URLs need resolving.
- Look for dynamic or inaccessible content that was absent from the fetched HTML.
- Keep a sample of source pages and expected output for regression checks when changing extraction or conversion rules.
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