Online Line Tools with 8 processing modes for deduplicating, sorting, filtering, merging, and splitting lines

• Deduplicate lines

  Remove duplicate lines with support for case sensitivity and keeping the first or last occurrence.

• Sort lines

  Sort lines alphabetically, numerically, by length, or using natural sort order in ascending or descending order.

• Add line numbers

  Prepend line numbers with configurable start value, step, zero-padding, and separator.

• Add prefix and suffix

  Wrap every line with a prefix, suffix, or both. Useful for adding quotes, commas, or HTML tags.

• Filter lines

  Keep or remove lines that match a text pattern or regular expression.

• Merge lines

  Combine all lines into a single line with a custom separator.

• Split into lines

  Split whole input text into multiple lines using a separator or regex.

• Regex per line

  Apply a regex find-and-replace to each line independently.

1. 1

   Paste multi-line text into the input area.

2. 2

   Select a processing mode from the mode buttons.

3. 3

   Adjust mode-specific options as needed.

4. 4

   Toggle general options like case sensitivity, trimming, or empty line handling.

5. 5

   Copy the result, or send the output back to the input to chain another operation.

• Use Deduplicate when you need to remove repeated lines from logs, lists, or CSV exports.
• Use Sort when you need to organize lines alphabetically, by length, or numerically.
• Use Add Line Numbers when preparing code listings, step-by-step instructions, or enumerated lists.
• Use Add Prefix/Suffix when you need to wrap each line with quotes, HTML tags, or CSV commas.
• Use Filter when you need to extract or remove specific lines based on a pattern.
• Use Merge when you need to combine multiple lines into a single comma-separated or formatted line.
• Use Split when you need to break a single line of comma-separated values into multiple lines.
• Use Regex Per Line when you need to transform each line independently with a regular expression.

If the source text already contains extra blank lines, trailing spaces, or copy-paste whitespace noise, start with Text Cleaner to normalize the structure. When repeated terms, paths, field names, or fixed patterns need batch changes, continue with Text Replace . For variable names, headings, and list labels that need consistent casing, use Case Converter ; before publishing or submitting the result, Text Counter helps check character and byte limits. If the organized lines are really table rows, pasted exports, or values that need columns, move them into CSV Tools for preview, filtering, and export.

• Enable Trim Each Line if the input has inconsistent indentation or leading/trailing spaces that could affect deduplication or sorting.
• Enable Skip Empty Lines when empty lines in the input should not be counted or processed.
• Use natural sort for file names or mixed text-and-number content where alphabetical sorting would produce unexpected order.
• When using regex per line, test your pattern on a small sample first to verify it produces the expected result.
• Use the output-as-input action to chain multiple operations: send the current result back to the input, then apply the next processing mode.

• Very large texts with thousands of lines may cause brief rendering pauses during processing.
• Deduplication removes consecutive or non-consecutive duplicates based on the current sort order.
• Regex per line uses JavaScript regular expressions. Complex patterns with lookbehind may not work in all browsers.
• The split mode splits text by a separator or regex. If the separator is not found, the entire text remains as one line.
• All processing happens locally in the browser. Nothing is uploaded to a server.