Duplicate Finder

Find Duplicate Items in Any List Instantly

Paste any list and instantly see which items are duplicated. This fast, privacy‑friendly tool counts duplicates, sorts them by frequency, and helps you clean data in seconds. It’s ideal for spreadsheets, exports from SaaS tools, tags, email lists, SKUs, and more.

How it works

Before counting, you can normalize inputs using two options: Trim whitespace removes leading and trailing spaces, while Ignore case treats values like Apple and apple as the same item. This prevents subtle formatting issues from hiding duplicates. After processing, the results panel lists each repeated value with an accurate count so you can prioritize fixes.

Great for

• Cleaning CSV columns before importing into a database
• Checking sign‑up lists for repeated emails or names
• Deduplicating tags, categories, or labels exported from CMS tools
• Auditing SKUs, IDs, or codes in inventory spreadsheets

Tips

• Sort by count to tackle the most frequent duplicates first
• Use Clear between runs to avoid mixing datasets
• Copy results and reconcile them in your spreadsheet for bulk edits

All processing happens locally in your browser. There are no uploads or accounts—just a focused, efficient tool that works great on both desktop and mobile.