Text-Tools

Add Prefix to Lines

Add text before each line.

100% Private - Your text never leaves your browser
0 chars · 0 lines
0 chars · 0 lines
Prefix:

About Add Prefix to Lines

Insert a custom prefix at the beginning of every line. This free online tool processes your text instantly in your browser - no data is ever sent to any server, ensuring complete privacy.

How to Use Add Prefix to Lines

  1. Paste or type your text in the input field on the left
  2. The result appears automatically in the output field
  3. Adjust any options below the text fields if available
  4. Click "Copy Result" to copy the output to your clipboard
  5. Use "Download" to save the result as a text file

Features

  • ✓100% Free - No registration required
  • ✓Instant processing as you type
  • ✓Complete privacy - works offline
  • ✓No file size limits
  • ✓Works on all devices
  • ✓Download results as text file

Why Use Our Add Prefix to Lines?

Unlike other online tools that require uploads or send your data to servers, our add prefix to lines runs entirely in your browser using JavaScript. This means your sensitive text never leaves your computer, making it perfect for processing confidential documents, personal information, or any text you want to keep private. The tool is also lightning-fast since there's no network latency involved.

When to Use This Tool

Code Commenting

Add comment prefixes like // or # to multiple lines of code at once.

Bullet Points & Lists

Convert plain text lines into bulleted lists by adding "• " or "- " prefix.

Log Formatting

Add timestamps, severity levels, or identifiers to each line of log entries.

Email Quoting

Add "> " to each line when quoting text in email replies or forum posts.

Examples

Comment Code

Prefix: "// "
Lines: First line
Second line
// First line
// Second line

💡 Each line now has comment prefix

Create Bullet List

Prefix: "• "
Lines: Apple
Banana
Cherry
• Apple
• Banana
• Cherry

💡 Plain text converted to bullet list

Add Timestamps

Prefix: "[2024-01-15] "
Lines: Server started
User logged in
[2024-01-15] Server started
[2024-01-15] User logged in

💡 Add consistent timestamps to log entries

Common Mistakes to Avoid

⚠️

Forgetting trailing space in prefix

Solution: Include a space after your prefix: "// " not "//". Otherwise text runs together with no separation.

⚠️

Empty lines getting prefix too

Solution: Decide if blank lines should get prefixed. For comments, usually skip empty lines. Check tool options.

⚠️

Not escaping special characters

Solution: If prefix contains special characters (like regex symbols), they may need escaping depending on the tool.

Related Tools

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Add Suffix to Lines

Add text after each line.

Add Line Numbers

Number each line of text.

Add Quotes to Lines

Wrap each line in quotes.