行番号を追加

テキストの各行に行番号を追加します。

Input text

Start at

Increment

Separator

Numbers are added to each line · processing is local

Result

Total lines0

Characters0

PNG · ブラウザー内で作成、アップロードなし

Industry use cases

Code Review Discussion Developers add line numbers to code snippets in pull requests so reviewers can reference specific lines in comments.

Contract Clause Reference Legal teams add line numbers to contracts and agreements for precise cross-references during negotiations and review.

Academic Paper Citation Researchers add line numbers to source documents and excerpts to provide exact quotation references in academic work.

System Log Troubleshooting IT professionals add line numbers to server logs to quickly locate and discuss specific error entries during incidents.

Frequently asked questions

What does an add line numbers tool do?

It prefixes each line of your text or code with its sequential line number, making it easier to reference, debug, or discuss specific lines.

Can I add line numbers to code without changing the code itself?

Yes, the tool only adds number prefixes to the output; it does not alter the original characters, indentation, or formatting of your code.

What number does line numbering start from?

Line numbering starts at 1 for the first line and increases by one for each subsequent line, including blank lines.

Is adding line numbers the same as code minification?

No. Adding line numbers inserts reference numbers for readability, while minification removes whitespace and formatting to reduce file size; they are opposite goals.

Why would I add line numbers to a log file or contract?

Line numbers let you point to an exact spot, such as a specific error entry in a log or a clause in a contract, making references precise during reviews or discussions.

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