Markdown Footnote Helper
Insert [^n] footnotes in Markdown — without losing your flow
Drop numbered citation markers exactly where your cursor is and auto-append a matching definition at the bottom of the document. Detects orphans, picks the next free index, and runs entirely in your browser.
Footnotes in document
[^1]L5First edition publishers, 2024.[^2]L6Especially in long-form essays or spec drafts.
How to use the footnote helper
- Place your cursor in the document where you want a footnote.
- Type the definition text in the input at the top (e.g., "Source: Smith 2024").
- Click Insert marker + definition — the next free index is added inline at your cursor and appended to the bottom of the document.
- Need only one? Use Marker only or Definition only buttons. The next index updates automatically.
The status row shows your reference / definition counts and what the next marker will be.
Markdown footnote syntax (GFM)
This claim needs a citation[^1].
We can stack multiple references at once[^2][^3].
[^1]: Smith, J. (2024). Title of the source.
[^2]: Doe, A. (2023). Another reference.
[^3]: See also the discussion at https://example.com.
When rendered on GitHub, each [^1] becomes a small superscript link that scrolls to the definition.
Why use footnotes?
- Cleaner reading. Long parenthetical asides drop out of the sentence and into a structured "Notes" section.
- Better citation hygiene. Reviewers can audit sources without re-reading the body.
- Reusable references. The same definition can be cited multiple times from different paragraphs.
- Compatible with academic workflows. Pandoc-based pipelines (often used for books, theses, and journal submissions) understand the same syntax.
Things the helper checks for you
| Check | Meaning |
|---|---|
| References without definitions | A [^n] marker exists but no matching definition. |
| Definitions without references | A [^n]: definition exists but no marker uses it. |
| Next free index | The next numeric ID that won't collide. |
Both kinds of orphans break the cross-link experience on GitHub: markers without definitions render as plain text, definitions without markers become dead weight at the bottom of the file.
Renaming footnote numbers
If you delete a citation in the middle of a long document, the numbers will look out of order. Two approaches:
- Leave it. Renderers don't care about order — the link still works.
- Renumber. Open the entire body in your editor and find-replace from highest to lowest to avoid clobbering. Then re-run this helper to verify nothing was orphaned.
For frequent renumbering, consider using named footnotes ([^author2024]) instead of numbers. They're stable across edits at the cost of being slightly less compact.
Companion tools
- Markdown Editor — full editor with live preview, perfect for long-form drafting.
- Markdown Word Counter — track length while drafting cited content.
- Markdown Slug Generator — generate IDs for the "Notes" / "References" section.
Privacy & data
The helper runs inside your browser. Your document, every marker, and every definition stay local.
Frequently asked questions
- GitHub-Flavored Markdown supports reference-style footnotes. An inline marker like `[^1]` appears where you cite, and a matching definition `[^1]: explanation here` lives at the bottom of the document. GitHub renders the marker as a superscripted link to the definition.
- It picks the next free numeric index automatically, inserts the marker at your cursor position, and appends a matching definition block at the end of the document — all without breaking your flow. The orphan checker flags any markers without definitions and vice versa.
- Footnotes keep prose readable by moving citations, links, and asides out of the main flow. They're especially useful for technical specs, academic-style writing, blog posts that cite sources, and changelogs that reference issue numbers without cluttering the line.
- GitHub (in GFM), GitLab, Obsidian, Pandoc, Hugo, and most static-site generators support the `[^n]` syntax. Some older or stricter renderers (the original CommonMark spec, Bear, some chat platforms) do not. When in doubt, render a small sample on your target platform first.
- Yes — GFM supports both numeric and named footnotes. This helper focuses on numeric indices because they're easier to auto-increment, but you can hand-type named markers and definitions in the editor; the orphan checker still works for any `[^xxx]` pattern by index.
- No. The helper is a small client-side text transform. We never upload, log, or store the document content.