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GuideCase-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 By Tools.Town Team 5 min read
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.