You write Markdown. At some point you need HTML — for a static page, an email template, a CMS that only takes HTML, or just to see what the rendered output looks like before you publish.
Most online Markdown to HTML converters handle simple cases fine. The differences show up when you need GitHub Flavored Markdown (GFM) tables, fenced code blocks, and a clean HTML download rather than copy-pasting from a preview.
Here is how five free converters compare on the features that matter.
The Five Tools Compared
Dillinger.io
A full-featured editor with GitHub and Google Drive sync. The preview is live and the output HTML is clean. The main limitation: the interface is document-editor-focused rather than converter-focused — if you just want to paste Markdown and copy HTML, the workflow is slightly cumbersome. Requires internet for sync features. GFM tables are supported.
StackEdit
One of the more complete Markdown editors available in a browser. Supports GFM, LaTex math rendering, and sync with GitHub/Google Drive. Requires creating an account to save documents. If you want a persistent editor across sessions, StackEdit is worth the signup. For a one-off conversion, the account requirement is friction.
Marked.js Live Demo
A live demo of the Marked.js library. Bare-bones interface — input on the left, raw HTML output on the right. No styling applied to the output. Supports basic GFM but table rendering in the demo is inconsistent. Useful for developers testing library output, not for a polished conversion workflow.
CommonMark Demo
The reference implementation of the CommonMark spec. Input on left, rendered HTML on right. Does not support GFM tables out of the box — CommonMark and GFM are different specs and the demo implements only the former. Good for verifying CommonMark compliance. Not suitable for GitHub-flavored Markdown workflows.
Ultimate Tools Markdown to HTML Converter
The online Markdown to HTML converter at Ultimate Tools gives you a live two-panel editor: Markdown on the left, rendered preview on the right. Supports GitHub Flavored Markdown — tables, fenced code blocks, strikethrough, task lists. The HTML download button exports a clean HTML file with no styling overhead. No account, no file upload, everything runs in the browser.
Feature Comparison
| Feature | Dillinger | StackEdit | Marked Demo | CommonMark | Ultimate Tools |
|---|---|---|---|---|---|
| Live preview | ✅ | ✅ | ✅ | ✅ | ✅ |
| GFM tables | ✅ | ✅ | Partial | ❌ | ✅ |
| Code syntax highlight | ✅ | ✅ | ❌ | ❌ | ✅ |
| HTML download | ✅ | ✅ | ❌ | ❌ | ✅ |
| No account needed | ✅ | ❌ | ✅ | ✅ | ✅ |
| No upload to server | ❌ (sync) | ❌ (sync) | ✅ | ✅ | ✅ |
When GFM Tables Matter
CommonMark and GFM are different specs. If you write Markdown on GitHub, in a README, or in a static site generator like Jekyll or Hugo, you are almost certainly writing GFM. Tables look like this in GFM:
| Column 1 | Column 2 | Column 3 |
|---|---|---|
| Value A | Value B | Value C |
CommonMark does not support this syntax. If you paste a GFM table into the CommonMark demo, it renders as plain text. Dillinger, StackEdit, and Ultimate Tools all handle it correctly.
The Fastest Workflow for a One-Off Conversion
- Open the Markdown to HTML converter
- Paste or type your Markdown in the left panel
- The HTML preview renders live in the right panel
- Click Download HTML to save the file, or click Copy HTML to copy the raw output
No file upload, no account, no waiting. If your Markdown includes tables, code blocks, or task lists, they all render correctly in the preview.
When to Use Each Tool
- One-off paste-and-export → Ultimate Tools or CommonMark demo (fastest, no account)
- Writing a full document with sync → StackEdit (best persistence features)
- GitHub README preview → Dillinger or Ultimate Tools (both support GFM)
- Testing a Markdown library output → Marked.js demo (closest to raw library behavior)
- CommonMark spec compliance check → CommonMark demo
Related Tools
- minify javascript css html online free no ads no upload — after converting Markdown to HTML, minify the output to reduce file size before embedding in a page
- format and validate JSON online free — when your Markdown contains JSON code blocks, format and validate them here before including in the converted HTML
- encode and decode url query strings online free — percent-encode special characters before embedding Markdown content as a URL parameter value
Convert Markdown to HTML free — live preview, GFM tables, download as file →
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