Replace empty lines with a single line break

Normalize empty lines with options to remove, replace, or preserve whitespace-containing lines. Set custom replacements or trim spaces. Ideal for cleaning logs, code, and document formatting.

Input

Output

Processing Modes:

Basic Replacement Replace multiple empty lines with single line break

Remove All Empty Strip out all empty lines completely

Preserve Whitespace Lines Keep lines with spaces/tabs

Custom Replacement Replace with:

Trim Whitespace Remove whitespace before checking lines

Examples:

Basic Replacement

Before:

Line 1\n\n\nLine 2\n\nLine 3

After:

Line 1\n\nLine 2\n\nLine 3

Remove All Empty

Before:

A\n\nB\n\n\nC

After:

A\nB\nC

Preserve Whitespace

Before:

Line 1\n  \n\t\nLine 2

After:

Line 1\n  \n\t\nLine 2

Custom Replacement

Before:

A\n\n\nB

After (with '-'):

A\n-\nB

Trim Whitespace

Before:

Line 1\n  \n\t\nLine 2

After:

Line 1\n\nLine 2