Dedupe5000

Duplicate & phone carrier checker — deduplicate by business name, phone, personal name, or email, then identify each phone's carrier. Processes 100k+ contacts entirely in your browser.

1Upload CSV

📂

Drag & drop your CSV here, or browse to upload

Supports files up to 500MB+

2Map Columns & Dedup Mode

Phone Number Column

Business Name Column

Personal Name Column

Email Column

Deduplicate by

Phone Number Business Name Personal Name Email

Select one or more — a row is a duplicate if it matches on ANY checked field.

Remove rows where these columns are blank

Hold Ctrl/Cmd to select multiple columns. Rows blank in ANY selected column will be removed.

3Dedup Results

Duplicates removed. Proceed to carrier lookup, or skip straight to download.

4Carrier Lookup

Loading NPA-NXX carrier database…

Processing… 0%

Carrier lookup complete — Carrier and Line Type columns added.

npanxx.json not found.
To enable offline carrier lookup:
1. Download free NPA-NXX data from telcodata.us/download
2. Save as npanxx-raw.csv in this folder
3. Run node build-npanxx.js → generates npanxx.json
4. Redeploy to Netlify

You can still download the deduplicated CSV without carrier info below.

5Filter by Carrier & Line Type

Remove Line Types (select to exclude)

Hold Ctrl/Cmd to select multiple

Remove Carriers (select to exclude)

Hold Ctrl/Cmd to select multiple

6Email Verification

Verify emails on remaining leads — checks syntax, MX records, disposable domains, role addresses, and free providers.

Checking domains… 0%

Email verification complete — Email Status and Email Flags columns added.

Remove by Email Status (select to exclude)

Hold Ctrl/Cmd to select multiple

7Download

Clean CSV = remaining records after all dedup, carrier, and email filters applied.