Deduplicate mailing lists, CSV exports, and CRM phone number contacts. Fast in-memory deduplication ensures confidential customer data never leaves your device.
Processed client-side in your browser — files never leave your device.
Free, with no signup, account, or usage limits.
Works on any modern browser, including mobile.
About this tool
Use Remove Duplicates when you need to remove duplicate lines from text. Processing runs locally in your browser — your input is not uploaded to ThothBox.
How to use
Open Remove Duplicates and paste or type your input.
Choose any options that affect the output.
Run the tool or watch the live result update.
Copy or download the output.
FAQ
Is customer data uploaded to external servers?
No. All text processing and deduplication runs client-side in your browser's local JavaScript memory.