Merge & Split Lines – Free Online Text Line Tool

Merge two lists of lines side-by-side — pairing line 1 of list A with line 1 of list B using any separator (space, comma, tab, pipe, or custom). Or split each line of a text by delimiter (comma, semicolon, tab, pipe, or custom) or by fixed character width, turning each segment into its own line. Both modes support whitespace trimming and handle unequal list lengths gracefully. All processing is instant and runs entirely in your browser — your data never leaves your device.

Separator between columns

Preview:abc def
Column A
Column B
Result

How to Use the Merge & Split Lines

Features:

  • Merge two lists line-by-line with a custom separator.
  • Split each line by delimiter or fixed character width.
  • Supports space, comma, tab, pipe, or custom separators.
  • Handles unequal list lengths gracefully.

How to use:

  1. Enter your text in the Input area.
  2. Choose Merge or Split mode and configure options.
  3. View instant results in the Output area.
  4. Click Copy to copy results, or Clear to start over.

Tips:

  • All processing runs entirely in your browser — your data never leaves your device.
  • Works instantly with no server requests or API calls.