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.
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.