Merge Lines Tool

What Is the Merge Lines Tool?

The Merge Lines Tool joins multiple vertical lines of text into a single continuous string, replacing each line break with a custom separator — a comma, space, pipe, or any character you choose. It is the exact complement of the Split Text tool: where Split breaks one string into many lines, Merge collapses many lines into one.

How to Combine Multiple Lines into One

1. Copy your vertical list of items — from a spreadsheet column, text file, or database export.
2. Paste the list into the left text area.
3. Set your desired Separator in the input box, or click a preset button (Comma + Space, Pipe, etc.).
4. The merged output appears instantly in the right box. Click the copy icon to save it.

Where Can You Use the Merge Lines Tool?

Separator Options

• Comma + Space (, ): Standard CSV-style separator. Suitable for SQL, JSON arrays, and tag inputs.
• Space Only: Joins lines as words in a sentence — useful for merging a broken paragraph back into one line.
• No Space: Concatenates lines with nothing between them — for building compound strings or identifiers.
• Pipe ( | ): Common delimiter for database exports, TSV variants, and Boolean OR searches.
• Custom separator: Type any string — a word, \n for a newline, \t for a tab, or any multi-character delimiter.

Best Practices and Limitations

All processing runs locally in your browser — no text is sent to any server, making it safe for confidential IDs, API keys, or internal data exports.

Empty lines in your input are automatically skipped — they are not joined with the separator. This prevents extra delimiters in the output when your list has blank rows between items. The tool handles tens of thousands of lines instantly; performance only degrades for inputs above several megabytes, where a command-line tool would be faster.