ToolNest
HomeToolsFavoritesAbout
ToolNest

Practical tools for work and study—no signup. Policies and operator info are published on-site.

Navigation

  • Tools
  • About ToolNest
  • Guides
  • Favorites
  • Popular Tools

Legal

  • Terms of Service
  • Privacy Policy
  • Licenses
  • Contact
© 2026 ToolNest
  1. Home
  3. Tools
  5. Duplicate Line Finder

Duplicate Line Finder

Find duplicated lines in a pasted list. Show duplicated values separately.

Result
—

Add to favorites for quick access from the home page

Related tools

Tools often used together with this one

Remove Duplicates

Remove duplicate lines from a list. Paste your list, get unique items.

⚡ Browser Only🔒 No Upload🚀 Instant Processing

Line Sorter

Sort lines alphabetically or randomly. A-Z, Z-A, reverse, shuffle. Optional deduplication.

⚡ Browser Only🔒 No Upload🚀 Instant Processing

Text Difference

Compare two texts and highlight differences. Side-by-side or unified view.

⚡ Browser Only🔒 No Upload🚀 Instant Processing

Text Finder

Find specified strings within text. Add multiple search strings and discover all occurrences.

⚡ Browser Only🔒 No Upload🚀 Instant Processing
›How it works
  1. 1Paste a list with one item per line into the input area.
  2. 2The tool scans all lines and identifies which appear more than once.
  3. 3Duplicated lines are displayed separately from unique lines.
  4. 4Useful for identifying duplicates before removing them with the Remove Duplicates tool.

Example

Input: apple
banana
apple
cherry
Output: Duplicates: apple. Unique: banana, cherry