Duplicate Line Remover

Q: Does this remove exact or case-insensitive duplicates?

Both options are available. Case-sensitive mode treats 'Hello' and 'hello' as different lines. Case-insensitive mode treats them as the same and keeps the first occurrence.

Q: Can I see how many times each line appears?

Yes. Enable 'Show frequency' mode to see each unique line with its occurrence count, sorted by frequency (highest first).

Q: What happens to empty lines?

You can choose to ignore or keep empty lines using the 'Ignore empty lines' toggle. Empty lines are defined as lines with only whitespace.

Remove duplicate lines from any text. Choose exact or case-insensitive matching, sort output, and analyze line frequency.

Input Text (one line per entry):

Deduplication Options

Exact Match Case Insensitive

Sort Order

Keep Original A – Z Z – A

Trim whitespace from lines before comparison Ignore empty lines Show frequency (count occurrences)

How to Use the Duplicate Line Remover

Paste Your Text

Type or paste your text into the input area. Each line should contain one entry — a word, email address, URL, or any text string.

Choose Options

Select exact or case-insensitive matching. Toggle trimming, empty line filtering, and frequency analysis. Pick a sort order for the output.

Process & Copy

Click Remove Duplicates to clean your list. View the stats, then copy the result or swap it back to the input for further editing.

Modes Reference

Operation	Input	Output	Use Case
Exact Dedup	apple, banana, APPLE, apple	apple, banana, APPLE	Remove identical lines only
Case Insensitive	apple, banana, APPLE, Apple	apple, banana	Merge duplicates ignoring case
Frequency Mode	apple, apple, banana, apple	apple (3), banana (1)	Count how often each line appears
Sort A–Z	cherry, apple, banana	apple, banana, cherry	Alphabetical ordering

Frequently Asked Questions

Both options are available. Case-sensitive mode treats "Hello" and "hello" as different lines. Case-insensitive mode treats them as the same and keeps the first occurrence.

Yes. Enable "Show frequency" mode to see each unique line with its occurrence count, sorted by frequency (highest first).

For simple CSV cleanup, yes. For complex CSV with quoted fields containing newlines, a dedicated CSV tool is better. This tool works line-by-line.

You can choose to ignore or keep empty lines using the "Ignore empty lines" toggle. Empty lines are defined as lines with only whitespace.