Text Line Numbering Tool
About Line Number Generator
The Code & Document Line Numbering Generator formats source code and text documents with synchronized gutter line numbers, right/left text alignment, custom padding widths, and syntax-preserving indentation.
How to Use Line Number Generator
Step 1
Paste your code or text into the editor.
Step 2
Select gutter separator style and starting line number.
Step 3
Inspect the right-aligned line number gutter preview.
Step 4
Click "Copy Code with Line Numbers".
Practical Use Cases for Line Number Generator
Preparing Code Snippets for Printed Documentation
Add clean, right-aligned line number gutters to code snippets before inserting into PDF technical manuals or research papers.
Line Reference Numbering for Legal Depositions
Generate exact line numbers on legal transcripts so specific testimony lines can be cited accurately during trials.
Input & Output Examples
Adding Gutter Line Numbers to 3 Lines of Code
Code: const x = 1;\nconst y = 2;\nconsole.log(x + y); | Gutter Separator: " | "
1 | const x = 1;\n 2 | const y = 2;\n 3 | console.log(x + y);
Key Features & Performance
- ✓Right-aligned line number gutters with automatic padding based on total line count.
- ✓Custom gutter delimiters: ` | `, `: `, ` `, `] `.
- ✓Preserves original code indentation tabs and spaces perfectly.
- ✓100% Client-Side memory execution.
- ✓1-Click Copy formatted code.
Key Terminology & Definitions
Gutter (Typography & IDE)
The narrow vertical column alongside the text area used in text editors to display line numbers and code fold markers.
Right-Aligned Gutter Numbers
Aligning line numbers to the right edge of the gutter so that ` 9` and `10` align neatly along the column separator.