Paste a list and remove duplicate lines instantly. Choose how to match duplicates and keep the first or last occurrence for clean, consistent data.
How to use this Text Deduplicator effectively?
Paste or type your list with one item per line. Select a matching mode: exact for strict matches, case-insensitive for text variants, trim to ignore surrounding spaces, or trim plus case-insensitive for the widest match. Choose whether to keep the first or last occurrence, then review the output and copy the cleaned list. Use the stats panel to confirm how many lines were removed. If you are cleaning emails, usernames, or tags, start with case-insensitive plus trim to catch duplicates caused by formatting differences. For logs or IDs where case matters, stick with exact matching.
Why use an online Text Deduplicator?
Manual deduplication is slow and error-prone, especially with long lists. An online tool gives you instant results and clear statistics without installing spreadsheets or scripts. It is perfect for quick cleanup before importing data into a database, CRM, or spreadsheet. Because processing happens in your browser, sensitive lists like customer emails or internal IDs never leave your machine. The tool also helps teams standardize how duplicates are handled, which reduces inconsistent data across systems.
Features breakdown
- Multiple dedupe modes: exact, case-insensitive, trim, and trim + case-insensitive.
- Keep first or keep last to control which entry survives.
- Live stats showing original, unique, and removed line counts.
- Instant copy for clean lists ready to paste into tools or docs.
- Works with any text, from names and emails to log entries.
- Local-only processing for privacy and speed.
Common workflows for list cleanup
Use the deduplicator to clean email lists before sending a campaign, merge tag lists for content systems, or remove repeated IDs from export files. For logs, you can isolate unique error messages to speed up debugging. When building a contact list, keep the last occurrence if the newest row has the latest metadata. In file management, dedupe filenames or paths before batch operations to avoid unnecessary processing. These workflows save time and reduce mistakes during imports or automation.
FAQ
Q: What is the difference between exact and case-insensitive modes?
A: Exact mode treats "Apple" and "apple" as different lines. Case-insensitive mode treats them as duplicates, which is useful for names, tags, and emails.
Q: When should I keep the last occurrence?
A: Keep the last occurrence when the most recent entry contains updated information, such as a later timestamp or corrected data.
Q: Can this handle large lists?
A: Yes, it works well for most typical lists. For extremely large files, consider splitting the data into smaller batches for faster browser performance.