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Case-Sensitive vs Case-Insensitive Dedupe

When Apple and apple should count as duplicates — and when they must stay separate. Tools.Town dedupe toggles explained.

14 August 2026 4 min read By Tools.Town Team Fact Checked

Key Takeaways

  • Case-sensitive — URLs, paths, and codes usually care about case

Case-sensitive keeps Apple and apple as different lines. Case-insensitive merges them (first occurrence’s casing is kept).

Use insensitive for most email lists. Keep sensitive for paths and codes. Try Find Duplicate Lines to audit, then Remove Duplicates from List.

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Frequently Asked Questions

What is the default?
Case-sensitive — URLs, paths, and codes usually care about case.

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