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Remove Duplicate Lines

Normalization
Matching & Order
When duplicates exist
Output order
Other

Tip: Trim + Case-insensitive catch common near-duplicates like “Apple ”, “APPLE”, and “apple”.

Original lines
9
Considered (after ignore/trim)
7
Unique lines
5
Removed
2

Original List

Unique List

apple
banana
 orange
BANANA
Grape
TL;DR — paste a list, choose options, get a clean unique list

Drop in any list (or an Excel/Sheets column). Turn on trim/case/whitespace/Unicode normalization if needed, keep the first or last occurrence, preserve order or sort, and copy/download your Unique List. There’s also a Duplicates‑only audit view. Everything runs locally in your browser.

Remove Duplicate Lines — fast, private, and flexible

Paste any list and this lightweight online duplicate finder removes duplicate lines immediately. Choose whether to keep the first or last occurrence and whether to preserve the original order or sort the output. It’s perfect for mailing lists, tags, SKUs, log entries—any text that arrives with repeats.

Working in spreadsheets? Treat this like a quick “Excel remove duplicates” helper: copy a column from Excel or Google Sheets, paste here, then copy the Unique List back—no dialogs or formulas. Use the Duplicates‑only view to verify what was removed with counts before exporting.

Cleaning messy inputs? Turn on Case‑insensitive, Trim, Collapse inner whitespace, and Unicode normalization (NFC) to merge near‑duplicates like “Apple”, “ apple ”, and “APPLE”. Need alphabetized output? Switch to Sort. Want more cleanup first? Try Advanced Text Cleaner or Sort Lines. Pattern issues? Use the Regex Tester or Find & Replace.

How to use this duplicate remover

  1. Paste or import: One item per line in Original List or load a .txt file.
  2. Normalize: Toggle Trim, Case‑insensitive, Collapse inner whitespace, and Unicode NFC as needed.
  3. Decide behavior: Choose Keep first or Keep last and Preserve order or Sort.
  4. Review & export: Check Unique List or Duplicates‑only, then Copy or Download .txt.

Key features

  • Instant deduplication (client‑side; no uploads)
  • Normalization options: Trim, Case‑insensitive, Collapse inner spaces, Unicode normalization (NFC)
  • Keep mode: First occurrence or Last occurrence
  • Order modes: Preserve original order or Sort alphabetically
  • Duplicates‑only view with occurrence counts for auditing
  • Live stats: originals, uniques, removed
  • One‑click copy, .txt download, and .txt import
  • Great for Excel/Sheets columns—copy/paste in both directions

Tips

  • Enable Trim + Case‑insensitive to catch the most common near‑duplicates.
  • Collapse inner whitespace to merge variants like “New York” vs “New York”.
  • Use Unicode normalization (NFC) when your list mixes accent encodings (e.g., café vs café).
  • Prefer Preserve order for log or SKU streams; use Sort for clean, alphabetized outputs.
  • Check Duplicates‑only with counts before exporting to spot unexpected merges.

Frequently asked questions

How do I delete duplicate rows in Excel with this?
Copy a column from Excel/Google Sheets, paste it here, choose normalization (Trim/Case/Whitespace/Unicode) as needed, then copy the Unique List back and paste over your original column.
Can I keep the last duplicate instead of the first?
Yes—switch Keep mode to Last to retain the final occurrence.
Is matching case‑sensitive and whitespace‑aware?
Default is exact, case‑sensitive matching. Toggle Case‑insensitive, Trim, Collapse inner whitespace, and Unicode NFC to merge look‑alikes.
Does it preserve order?
Your choice: Preserve order keeps the input sequence; Sort alphabetizes the output.
Can I audit what was removed?
Yes—open Duplicates‑only to see removed values and counts before copying or downloading.
Is my data private?
Completely. Processing is 100% client‑side; nothing is uploaded.

Related tools

Sort Lines · Advanced Text Cleaner · Regex Tester · Find & Replace

Last updated: Aug 25, 2025