How to Build Notion Formula for Markdown to Rich Text Conversion

Notion databases store text as plain strings. When you paste Markdown content into a database property, Notion displays the raw syntax instead of rendering it as styled text. This article explains how to build a Notion formula that converts Markdown syntax into rich text formatting within a formula property. You will learn the exact steps to parse bold, italic, code, and link Markdown patterns and output a formatted result.

How Notion Formulas Interpret Markdown Syntax

Notion formulas do not natively parse Markdown. The formula property outputs text that can include bold, italic, inline code, and links, but you must explicitly define those styles using the style() function. The replaceAll() function lets you find Markdown patterns and replace them with styled substrings. Because replaceAll works on strings, you chain multiple calls to handle each Markdown type one after another.

The formula reads a source text property — for example, a property named “Markdown Input” — and outputs a formatted string in the formula property. Every Markdown token (like or __ for bold, or _ for italic, ` for inline code) must be matched by a replaceAll call that wraps the matched text in the corresponding style() function.

Prerequisites

You need a Notion database with at least two text properties: one to hold the raw Markdown text (call it “Markdown Input”) and one formula property (call it “Formatted Output”). The Markdown text must use standard syntax: bold, italic, `code`, and [link text](url). The formula will not handle nested Markdown (e.g., bold inside italic) or block-level elements like headings or lists.

Steps to Build the Markdown-to-Rich-Text Formula

1. Create the source property
   In your Notion database, add a new text property named “Markdown Input”. Paste or type your Markdown text into this property. This property will serve as the raw input for the formula.
2. Add a formula property
   Click the + icon in the database header and select “Formula”. Name it “Formatted Output”. Open the formula editor by clicking the property name.
3. Write the bold replacement
   Enter the following code to convert bold into bold:
   replaceAll(prop("Markdown Input"), "\\\\(.?)\\\\", style("$1", "b"))
   This matches text between double asterisks and applies bold styling. The .? captures the inner text. The backslashes escape the asterisks in the regex pattern.
4. Add italic replacement
   Wrap the previous call in another replaceAll to handle italic:
   replaceAll(replaceAll(prop("Markdown Input"), "\\\\(.?)\\\\", style("$1", "b")), "\\(.?)\\", style("$1", "i"))
   The inner replaceAll first handles bold, then the outer one handles italic. This prevents the italic pattern from matching inside bold text that was already processed.
5. Add inline code replacement
   Extend the formula to convert `code` into code:
   replaceAll(replaceAll(replaceAll(prop("Markdown Input"), "\\\\(.?)\\\\", style("$1", "b")), "\\(.?)\\", style("$1", "i")), "`(.?)`", style("$1", "c"))
   The "c" argument in style() applies inline code formatting.
6. Add link replacement
   Finally, add a replacement for [link text](url):
   replaceAll(replaceAll(replaceAll(replaceAll(prop("Markdown Input"), "\\\\(.?)\\\\", style("$1", "b")), "\\(.?)\\", style("$1", "i")), "`(.?)`", style("$1", "c")), "\\[(.?)\\]\\((.?)\\)", style("$1", "a", "$2"))
   The style("$1", "a", "$2") creates a hyperlink where $1 is the link text and $2 is the URL.
7. Test the formula
   Enter sample Markdown in the “Markdown Input” property, such as This is bold and italic and `code` and [a link](https://example.com). The “Formatted Output” property should display the text with proper rich text styling. If the output shows raw Markdown, check that all backslashes are correct and that the regex patterns use double backslashes.

Common Mistakes and Limitations

Formula shows raw Markdown syntax

The most common cause is missing double backslashes before asterisks or brackets in the regex pattern. Notion formulas require two backslashes to represent a literal backslash in regex. For example, \\ matches a literal asterisk. If you use a single backslash, the formula treats the asterisk as a regex quantifier and fails to match.

Nested Markdown is not supported

The formula uses non-greedy matching (.?) which works for simple cases. Nested syntax like bold and italic inside will not render correctly because the outer bold pattern captures the entire string, leaving the italic pattern unmatched. The formula processes replacements in order, so any unprocessed Markdown remains as plain text.

Links with special characters in the URL

The link regex \\[(.?)\\]\\((.?)\\) expects the URL to be enclosed in parentheses without spaces. If the URL contains parentheses (e.g., https://en.wikipedia.org/wiki/Notion_(software)), the regex stops at the first closing parenthesis. For such cases, encode parentheses in the URL as %28 and %29 before pasting into the input property.

Formula Capabilities: Plain Text vs Rich Text Output

Item	Plain text formula output	Rich text formula output
Bold support	Shows text literally	Renders text using style("$1","b")
Italic support	Shows text literally	Renders text using style("$1","i")
Inline code support	Shows `text` literally	Renders text using style("$1","c")
Link support	Shows [text](url) literally	Renders clickable link using style("$1","a","$2")
Nested Markdown	Not applicable	Not supported — outer pattern captures inner tokens
Performance on large text	No delay	May slow down for text over 500 characters due to multiple regex passes

You can now convert Markdown text into formatted Notion database entries using a single formula property. Test the formula with your most common Markdown patterns first. For more advanced conversions, consider chaining additional replaceAll calls for strikethrough (~~text~~) or image syntax, but keep in mind that formula complexity increases the risk of hitting Notion’s character limit for formula expressions.