What are Line Tools?
Line tools are a collection of text utilities that operate on individual lines of text. Whether you need to sort a list alphabetically, remove duplicate entries from a dataset, reverse the order of log entries, or add numbering to a list, line tools make these repetitive tasks effortless. Every operation runs entirely in your browser — your data never leaves your device.
Use Cases
Data Cleaning
Remove duplicate rows, strip extra whitespace, and sort entries before importing into a database or spreadsheet. Perfect for cleaning CSV columns, email lists, and keyword lists.
Log Processing
Reverse chronological log output, remove empty lines from verbose logs, or shuffle test data. Quickly isolate unique error messages by deduplicating log lines.
CSV & List Prep
Add line numbers for reference, join lines into comma-separated values, wrap entries in quotes for SQL or JSON, or prefix/suffix lines with custom delimiters.
Frequently Asked Questions
Paste your text into the input area and click "Remove Duplicates." The tool keeps the first occurrence of each unique line and discards subsequent duplicates, preserving the original order.
Yes. Click "Sort Numerically" and the tool will parse the leading number from each line and sort in ascending numeric order. Lines without numbers are treated as zero.
Shuffle Lines randomizes the order of all lines using the Fisher-Yates algorithm. This is useful for creating randomized test data, quiz questions, or playlist orders.
No. Every operation runs 100% in your browser using JavaScript. Your text never leaves your device, making this tool completely private and safe for sensitive data.
Type your desired prefix or suffix text into the small input field, then click the corresponding button. Every line in your input will have that text added to the beginning (prefix) or end (suffix). For example, prefixing with "- " turns each line into a Markdown list item.
Remove Empty Lines only removes lines that are completely empty (zero characters). Remove Whitespace Lines also removes lines that contain only spaces, tabs, or other whitespace characters.
Yes. After an operation produces output, copy it back into the input area (or simply run another operation on the current input). Each operation always reads from the input textarea, so you can iteratively process your text.
Join (Comma) takes every line from the input and combines them into a single line separated by ", ". This is handy for turning a vertical list into a comma-separated value string for use in code, SQL IN clauses, or spreadsheets.