MD019 - No multiple spaces after hash in heading¶

Aliases: no-multiple-space-atx

What this rule does¶

Ensures there's only one space between the # symbols and the heading text.

Why this matters¶

• Consistency: Extra spaces create inconsistent visual spacing
• Compatibility: Some Markdown processors may not handle multiple spaces correctly
• Cleanliness: Single spacing looks professional and clean

Examples¶

✅ Correct¶

# Heading 1
## Heading 2
### Heading 3
#### Heading 4
##### Heading 5
###### Heading 6

❌ Incorrect¶

#  Heading 1
##   Heading 2
###    Heading 3
####     Heading 4
#####      Heading 5
######       Heading 6

🔧 Fixed¶

# Heading 1
## Heading 2
### Heading 3
#### Heading 4
##### Heading 5
###### Heading 6

Configuration¶

This rule has no configuration options.

Automatic fixes¶

This rule automatically removes extra spaces, leaving just one space after the # symbols.

Learn more¶

• CommonMark specification for headings - Technical details about heading syntax

Related rules¶

• MD018 - No missing space after hash in heading
• MD020 - No missing space in closed heading
• MD021 - No multiple spaces in closed heading
• MD022 - Headings should be surrounded by blank lines