Deduplicate mailing lists, CSV exports, and CRM phone number contacts. Fast in-memory deduplication ensures confidential customer data never leaves your device.
Specifications & Details
Feature
Specification
Execution Mode
In-Browser (Client-Side WebAssembly / JS)
Privacy Guarantee
Zero Server Transfer — 100% Local Device Processing
Supported Formats / Inputs
text, duplicates, unique
Pricing & Usage Limits
100% Free Forever — No Signup, Unlimited Use
Browser Compatibility
Chrome, Firefox, Safari, Edge, Mobile Browsers
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.
Common Use Cases for text tools
When you need to deduplicate mailing lists, CSV exports, and CRM phone number contacts, Remove Duplicate Emails & Contact Lists handles it right in your browser — no download or installation required.
Use Remove Duplicate Emails & Contact Lists to prepare data before sharing or archiving it: everything stays on your device.
Remove Duplicate Emails & Contact Lists works on any computer, including shared or locked-down machines where you cannot install software.
Bookmark Remove Duplicate Emails & Contact Lists for repeatable tasks: open the page, run the job, download the result — free and unlimited.
Key Advantages
Zero server upload. Your files are processed entirely in your browser and never reach ThothBox servers.
Instant results. No upload queues or waiting rooms: the job runs at native browser speed on your own hardware.
No registration. No account, email, or usage limits — open the page and start working immediately.
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.