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Line Numberer

Line Numberer is a completely free, instant-use online text tool that adds or removes line numbers on multi-line text in batches. It is an efficient helper for code sharing, document annotation, log analysis and form arrangement. The tool offers two core operations: add line numbers, which automatically numbers every line with customizable start index, digit padding (such as 001 format) and a separator between the number and the content; and remove line numbers, which intelligently detects and strips number prefixes on the left side of lines, automatically compatible with common formats like 1. , 1), [1] , 01 plus space. Whether you are preparing a code snippet to share on a forum or social platform and want line numbers, locating line positions while reviewing logs, restoring a numbered document to plain text, or batch-numbering list items, it completes the task accurately in an instant. The processed result can be copied or downloaded in one click for immediate use. All processing happens locally in your browser — your text is never uploaded to any server, so your privacy is protected. The interface is clean and simple, available in Simplified Chinese, Traditional Chinese and English, automatically follows the website language, theme color and corner-radius style, and works on both desktop and mobile. No registration, no installation — just open and use. Line Numberer is a high-frequency practical tool for programmers, editors, DevOps staff and students.
Line Numbers 📂 Text 👤 ToolWorld 🏷️ v1.1.12
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Line Number Tool

Add · Remove

Action
Input {count} chars
Result 0

How to Use

📖 Tool Introduction

The Line Number Tool is a free, instant online helper that adds line numbers to multi-line text in one click, or strips them off cleanly when you no longer need them — a practical companion for reading long code, printing documents, marking up essays and arranging lists. Paste your text into the box, choose Add line numbers or Remove line numbers, and the tool processes each line immediately. When adding numbers, every line gets a neatly aligned index on its left so you can easily reference “line 12” and the like; when removing them, the tool automatically recognises common numbering styles (digits followed by a dot, a colon, a space and so on) and deletes them, giving you back the clean original text. The result can be copied in one click for direct use in your editor, document or chat window. All processing happens locally in the browser — nothing is uploaded, so your privacy is safe. The interface is minimal, supports Simplified Chinese, Traditional Chinese and English following the website language, and runs smoothly on desktop and mobile alike. Whether you are a developer pinpointing a line in an error log, a teacher annotating an essay line by line, an editor numbering a manuscript, or someone numbering a checklist, this tool makes the job effortless.

✨ Key Features

  • Add numbers: every line gets a clean, aligned index on its left
  • Remove numbers: recognises common formats like “1.”, “1:” and “1 ” and strips them
  • Line-by-line: blank lines keep their order and numbers stay continuous
  • Neat alignment: indexes are right-aligned with the text following
  • One-click copy: results are ready to paste into editors and documents
  • Local processing: text never leaves the browser
  • Three languages: Simplified Chinese, Traditional Chinese and English
  • Multi-device: works smoothly on phones and desktops

📝 How to Use

  1. Paste your multi-line text into the input box (one item per line)
  2. Choose the action: Add line numbers or Remove line numbers
  3. Click Process and the result appears in the output area instantly
  4. Click Copy result to use it right away

⚠️ Notes

  • Number formats: removal supports common styles like “1.”, “1:” and “1 ”; unusual formats may need manual cleanup
  • Blank lines: empty lines keep a number too, matching document and code reading habits
  • Text size: keep batches below tens of thousands of lines for smooth handling
  • Privacy: text is processed locally only, so source code and sensitive content are safe

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