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Add Line Numbers

Add line numbers to text with a custom start and separator. Adds line numbers with custom start and separator for code and docs.

วิธีใช้งาน

Paste text and set the starting number to add line numbers.

Overview

Add Line Numbers is a text tool that Add line numbers to text with a custom start and separator. Adds line numbers with custom start and separator for code and docs. It runs 100% in your browser with no upload, so you get instant results with privacy. Whether you need a quick answer or batch processing with precise control, you can enter, validate and export in seconds. The UI is responsive on mobile, tablet and desktop and supports one-click copy.

Use cases

  • Count words/chars and reading time
  • Format JSON/HTML snippets
  • Batch process CSV columns
  • Clean duplicates and whitespace
  • Use it to cross-check “行号添加、文本行号” in reports, docs or APIs to avoid manual conversion errors

How to use

  1. 1 Paste text
  2. 2 Choose cleaning actions (dedupe, trim, case)
  3. 3 Preview diff with line numbers
  4. 4 Copy or download

Highlights

  • Local & private: processing stays in your browser
  • Live validation with tolerant parsing
  • One-click copy and export for docs, code or sheets
  • Batch and offline support under poor network

Notes

  • Word vs char counts differ
  • Split very long texts
  • Dedupe is case-sensitive by default

FAQ

Regex supported?
Yes in find/replace tools.
Preserve formatting?
Line breaks preserved by default.
How is Add Line Numbers different?
It runs locally with a focus on speed and privacy, plus tolerant parsing for “行号添加、文本行号” and one-click copy for reuse.
Can I use results in official reports?
Use it as a working draft and cross-check with authoritative sources; keep the exported log and parameters for traceability.
Tip：Tip: Bookmark this page or pin the tab; find related tools via categories and search (convert → calculate → export).
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All calculations run locally in your browser; nothing is uploaded.