Duplicate Line Remover - Remove Repeated Lines

A duplicate line remover scans your text and deletes repeated lines while keeping the order you choose. It helps clean lists, logs, or datasets without manual editing. Processing stays in your browser, so the content never leaves your device.

1. Paste text: Add any list, log snippet, or dataset lines.
2. Set options: Choose to keep the first occurrence, remove blanks, and toggle case sensitivity.
3. Get results: See the de-duplicated list instantly. Copy it or download as a text file.

• Save time: Strip repeats from big lists in seconds.
• Better data: Clean tags, emails, or IDs before importing.
• Local privacy: Logs and lists stay on your device.

Use case 1: Email lists

Remove repeat addresses before uploading to a mailing tool.

Use case 2: Log cleanup

Deduplicate repeated error lines to focus on unique entries.

Use case 3: Tag normalization

Clean product tags or keywords to avoid duplicates in filters.

Basic example

Input:

alpha
beta
alpha
gamma

Setting: Keep first occurrence
Output:

alpha
beta
gamma

Advanced example

Input: 500-line server log
Settings: Case sensitive off, remove blank lines on
Output: Unique lines only, ready to export.

Hidden whitespace

Trailing spaces can make lines look unique. Enable trim whitespace before deduping.

Case differences

If "Error" and "error" should be the same, turn off case sensitivity.

• Run the remove line breaks tool first if your list is wrapped.
• For sorting plus deduping, sort lines externally after this step to keep order predictable.
• Export cleaned lists and version them in your repo for repeat use.

• Count words with the word frequency counter.
• Strip formatting first using the plain text converter.

All processing runs locally in your browser. No text is uploaded or stored.