Best Free Online Developer Tools to Use in 2026
A practical, opinionated list of the best free online developer tools worth using in 2026, organized by category so you can find what you need fast.
Aug 08, 2026
Markdown to HTML
Write Markdown on the left, see the rendered HTML preview on the right in real-time.
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- Markdown to HTML
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Markdown
Output
How to Use
- Write Markdown on the left panel — see the HTML preview update in real-time on the right.
- Copy the generated HTML using the Copy HTML button, or Download as an .html file.
- Click Example to load a sample Markdown document that demonstrates all supported syntax.
- Use Clear to reset and start fresh.
Tip
Supports standard Markdown: headings, bold, italic, links, images, code blocks (with syntax hint), lists, blockquotes, tables, horizontal rules, and inline code.
Markdown Syntax Reference
| Element | Markdown | HTML |
|---|---|---|
| Heading 1 | # Heading | <h1>Heading</h1> |
| Bold | **bold text** | <strong>bold text</strong> |
| Italic | *italic text* | <em>italic text</em> |
| Link | [text](url) | <a href="url">text</a> |
| Code Block | ```js ... ``` | <pre><code>...</code></pre> |
| Inline Code | `code` | <code>code</code> |
| Unordered List | - item | <ul><li>item</li></ul> |
| Ordered List | 1. item | <ol><li>item</li></ol> |
| Blockquote | > quote | <blockquote>quote</blockquote> |
| Horizontal Rule | --- | <hr> |
| Image |  | <img src="url" alt="alt"> |
| Table | \| A \| B \| | <table><tr><td>...</td></tr></table> |
Frequently Asked Questions
Does this tool support GitHub Flavored Markdown (GFM)?
This tool supports standard Markdown with common extensions including tables, fenced code blocks (with language hints), strikethrough, and task lists. It covers most GFM features.
Is my data sent to a server?
No. All Markdown parsing and HTML rendering happens 100% client-side in your browser using a custom-built JavaScript parser. Your text never leaves your machine.
Can I use this for README files or documentation?
Yes! This tool is perfect for previewing README.md files, writing documentation, creating blog post drafts, or any content that needs to be converted between Markdown and HTML.
Last updated: 17 Aug 2026
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