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Add Prefix to Text Lines

Reformat datasets by prepending strings line-by-line or per paragraph. Normalize logs and source code via recursive logic for clean data mapping.

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Mode
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Please configure parameters and execute the action.

About Add a Prefix to Text Lines


Add a prefix to text lines quickly and easily. This tool allows you to prepend a prefix to your text in three different modes: Line-by-line Mode (adds prefix to each line), Paragraph Mode (adds prefix to each paragraph), or Single at Start (adds prefix once at the beginning of the entire text). Useful for adding line numbers, bullet points, timestamps, or any other prefix to your text.

Features


The Add a Prefix to Text Lines tool provides the following features:

  • Multiple Modes - Choose between Line-by-line, Paragraph, or Single at Start mode.
  • Flexible Prefix - Add any text as a prefix, including numbers, symbols, or custom text.
  • Preserve Formatting - Maintains original line breaks and paragraph structure.
  • Easy to Use - Simply enter your text, specify the prefix, choose a mode, and process with a single click.
  • Line-by-line Mode - Adds prefix to each individual line of text.
  • Paragraph Mode - Adds prefix to each paragraph (separated by double line breaks).
  • Single Mode - Adds prefix once at the very beginning of the entire text.

Examples


  • Line-by-line Mode
    Input:
    Hello
    World
    Test
    
    Prefix: - 
    Mode: Line-by-line
    
    Output:
    - Hello
    - World
    - Test
  • Paragraph Mode
    Input:
    First paragraph.
    
    Second paragraph.
    
    Third paragraph.
    
    Prefix: [1] 
    Mode: Paragraph
    
    Output:
    [1] First paragraph.
    
    [1] Second paragraph.
    
    [1] Third paragraph.
  • Single at Start
    Input:
    This is a long text
    with multiple lines
    and paragraphs.
    
    Prefix: START: 
    Mode: Single at Start
    
    Output:
    START: This is a long text
    with multiple lines
    and paragraphs.

Real-World Usage Scenarios


  • Code Documentation - Commenting Blocks - Software developers can prepend comment markers such as //, #, or -- to multiple lines of code at once. This is ideal for quickly disabling blocks of logic or adding standardized documentation headers across script files.
  • Inventory Management - SKU Categorization - E-commerce managers can update long lists of product IDs by prepending warehouse codes or category prefixes (e.g., adding 'ELEC-' to a list of serial numbers) to prepare data for bulk CSV uploads.
  • Content Formatting - Markdown Lists - Copywriters can transform plain text lists into Markdown-ready bullet points by prepending hyphens (-) or asterisks (*) to every line, ensuring consistent formatting for blog posts or documentation.
  • System Administration - Log Tagging - IT professionals can use Paragraph Mode to add timestamps or environment labels like [PRODUCTION] or [DEBUG] to the start of specific log blocks before sharing them for troubleshooting.

Frequently Asked Questions


How does Paragraph Mode differ from Line-by-line Mode?

Line-by-line Mode applies the prefix to every single line break. Paragraph Mode identifies blocks of text separated by double line breaks and only prepends the prefix to the start of those specific sections.

Will the tool process empty lines between my text?

In Line-by-line Mode, the tool will add the prefix to every line, including empty ones. To avoid this, ensure your input text has no unintended empty breaks before processing.

Are there any privacy concerns with the text I paste?

No. All text processing is performed locally within your web browser. Your data is never uploaded to a server or stored externally, ensuring full confidentiality for sensitive logs or code.

Can I use special characters or symbols as a prefix?

Yes, the tool supports all standard UTF-8 characters, including symbols, tabs, spaces, and mathematical operators, allowing for precise technical formatting.

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