Share contact lists without sharing data

Upload your CSV. We normalize each field, apply a one-way cryptographic hash, and return a file only useful for matching — not for reading.

1

Upload your CSV

Names, emails, phones, NPIs, addresses.

2

We standardize

Phone → 10-digit, email → lowercase+strip alias, name → no credentials.

3

We hash irreversibly

HMAC-SHA256. The output cannot be reversed into real data.

4

Download & share

Give the hashed file to a matching partner. No real data ever leaves.

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Drop your file here or click to browse
CSV or Excel (.csv, .xlsx)  ·  Max 50 MB
Privacy guarantee: We store a server-side copy of your original file encrypted at rest for compliance record-keeping (you agree to this by uploading). The hashed output file you download contains no readable data — only cryptographic fingerprints. Your business partner receives only the hashed file.  ·  See how to generate hashes yourself without uploading.