How do I remove duplicate lines online?

Paste your text, check 'Remove duplicate lines', and click Clean. The tool removes all repeated lines, keeping the first occurrence. Optionally sort them first for a clean deduplicated list.

How do I remove blank lines from text?

Check 'Remove empty/blank lines' and click Clean. Lines containing only whitespace are also removed when 'Trim lines' is enabled.

Line Cleaner — Remove Duplicates, Empty Lines, Comments

Remove duplicate lines Remove empty / blank lines Trim whitespace from each line Remove # comment lines Case-insensitive dedup Sort lines (A–Z) Add line numbers Reverse order

What is the difference between empty lines and blank lines?

An empty line has no characters at all. A blank line may contain spaces or tabs that make it visually empty but not technically empty. The Line Cleaner handles both — trim lines first, then remove empty ones to catch both cases.

Can this fix Windows/Unix line ending issues?

Yes — set the output line ending to LF (Unix) to convert CRLF Windows line endings to Unix format, or vice versa. This is commonly needed when sharing files between Windows and macOS/Linux systems.

How to Use line-cleaner

Paste or enter your input into the text field.
Configure any options (format, delimiter, encoding, or mode) using the controls above the output.
The result updates instantly — no submit button required for most operations.
Click Copy or Download to take the output to your next step.

Remove duplicate lines, empty lines, and clean up text. Completely free and browser-only: your data never leaves your device, no uploads involved.

How line-cleaner Works

line-cleaner is a browser-side text utility built for speed and simplicity. Paste your input and the result appears within milliseconds. The tool handles edge cases — empty inputs, special characters, large datasets — without crashing or producing silent incorrect output. If you need a related operation, check the Related Tools section below.

Accepts large inputs — no size limits imposed by this tool
Handles edge cases: empty fields, special characters, and Unicode
Copy-to-clipboard and file download for every output
Works on Chrome, Firefox, Safari, and Edge without any extensions

Frequently Asked Questions

What does line-cleaner do?

line-cleaner remove duplicate lines, empty lines, and clean up text. Results appear immediately — no page reloads, no waiting for a server response.

What input does line-cleaner accept?

Paste text directly into the input field, or type your data. Most operations handle Unicode, special characters, and multi-line inputs without issue.

How large an input can I process?

There is no hard limit imposed by this tool. Very large inputs (multi-MB text) process within your browser's available memory. For files larger than 50 MB, a command-line tool may be faster.

Can I download the output?

Yes — every output panel includes a Copy to Clipboard button and a Download as file option. Outputs are saved as plain text or the appropriate file format for the operation.

Explore the full suite of Text tools and 290+ other free utilities at Chunky Munster.

Line Cleaner online

Remove duplicate lines, empty lines, and clean up text — runs in your browser