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Markdown Heading Extractor

Extract ATX Markdown headings with levels and line numbers.

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  1. 01

    Add your input

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  2. 02

    Make it yours

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  3. 03

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Extract ATX Markdown headings with levels and line numbers online

Extract ATX Markdown headings with levels and line numbers. Use this for the specific transformation described above. Start with the fixed sample and compare its result before replacing it with your own representative input.

How to use it

Paste the multi-line input in the format shown below. Choose Run tool. Review the output, then copy or download it.

Worked examples

Use this for the specific transformation described above. Start with the fixed sample and compare its result before replacing it with your own representative input.

Reproducible worked example

Settings: No additional settings.

Input:

# Main
Text
## Details

With the input and settings above, the tool produces:

Output:

[
  {
    "level": 1,
    "text": "Main",
    "line": 1
  },
  {
    "level": 2,
    "text": "Details",
    "line": 3
  }
]

The example returns 2 top-level items in an array. Each item is a record; the first record contains “level”, “text”, “line”.

Limitations and common mistakes

  • ATX line pattern only; headings in fenced code blocks are not excluded.
  • Combined input is bounded to 150,000 characters; output text is bounded to 1.2 million characters. Some algorithms impose smaller limits, stated in their error messages.

Frequently asked questions

What format should I enter?

Paste the multi-line input in the format shown below. The worked example shows the supported structure and actual output.

How can I pull out ATX Markdown headings with levels and line numbers online?

Paste the multi-line input in the format shown below. Choose Run tool. Review the output, then copy or download it.

Where is my input processed?

The bundled tool processes input in your browser. It does not upload tool input to a conversion service. Other site plugins, analytics, advertising and browser extensions may have separate behavior.

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