Duplicate Line Remover

Remove duplicate lines from lists, CSV exports, and messy pasted text in one click.

1
Original lines
1
Unique lines
0
Duplicates removed
Deduplicated lines
—

About this tool

Exported email lists, CSV dumps, and copy-pasted URLs often contain duplicates that skew counts and break imports.

Deduplication preserves the first occurrence of each line so order stays intact — useful when sequence matters.

How to use the Duplicate Line Remover

  1. 1

    Paste your text with duplicate lines into the input box.

  2. 2

    Choose whether to match lines case-sensitively or ignore case.

  3. 3

    Copy the cleaned list — duplicates removed locally in your browser.

Workflow tips

Run dedupe before sorting — otherwise duplicates may scatter through a sorted list visually.

Case-insensitive mode treats "Apple" and "apple" as the same line.

Pro tips

  • Trim whitespace first with the whitespace remover for cleaner dedupe results.
  • Export deduped lists immediately — browser refresh clears unsaved work.

Social Media Specs & Character Limits

Optimal text formatting, length guidelines, and parameters for all major platforms:

PlatformMax LengthIdeal LengthHashtag Policy
Instagram Feed & Reels2,200 chars125 - 150 chars3 - 5 tags (Recomm.)
TikTok Posts4,000 chars100 - 200 chars3 - 5 tags (Ideal)
YouTube Description5,000 chars1,500 chars (SEO)3 - 10 tags
X / Twitter Post280 chars100 - 140 chars1 - 2 tags
LinkedIn Articles & Posts3,000 chars500 - 1,000 chars3 - 5 tags

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Frequently Asked Questions

Does it preserve line order?▼

Yes. The first occurrence of each line is kept; later duplicates are removed while order stays intact.

Can I remove empty lines too?▼

Use the whitespace remover tool to strip blank lines after deduplicating.