Remove Duplicate Lines

Clean up text by removing duplicate lines. Choose case sensitivity, trimming, keeping first/last, sorting, and counts. Run locally or via Django API.

Use Django API

Case sensitive Trim whitespace Ignore empty lines Show counts

Keep

First occurrence
Last occurrence

Order

Sort output (A→Z)

Line endings

Status

Idle

Input

Tip: Ctrl/Cmd + Enter to run.

Output

Read‑only. Use Copy or Download.

Removing Duplicate Lines — Practical Tips

Deduping is essential when cleaning logs, email lists, CSV extracts, and scraped data. This tool removes repeated lines, optionally trimming whitespace, ignoring blanks, and counting occurrences. Use “Keep Last” when downstream data needs the most recent entry.

Common scenarios

Normalize subscriber lists (case-insensitive)
Collapse noisy logs by unique message
Quick dedupe of exported IDs

Settings to try

Trim + Ignore empty to avoid false duplicates
Keep last to prefer latest occurrences
Show counts to see frequency

Line endings

Use CRLF for Windows tools
Use LF for Unix/Git
Keep to auto‑match the input

Example

Input:
alice
bob
Alice
bob
alice

Options: Case-insensitive, Trim, Ignore empty, Keep First
Output:
alice
bob