Subprocessors
These service providers process customer data on FaxSeal’s behalf. Which providers handle your data depends on the features you use.
Last updated November 6, 2026
Health information
Documents and details you send can contain health information. Self-service FaxSeal use is not authorized for protected health information (PHI) unless your organization has a Business Associate Agreement with FaxSeal. How BAAs work at FaxSeal →
Railway
May process document contentsApplication hosting and databases
- Data
- Account, fax job, contact and workflow records, and document content while the application processes it
- Used for
- All features
Cloudflare (R2)
May process document contentsStorage of uploaded, sent and received documents
- Data
- Document files, kept under FaxSeal’s retention policy
- Used for
- Sending, receiving and saving documents
Telnyx
May process document contentsFax transmission and fax number provisioning
- Data
- Sender and recipient fax numbers and document contents
- Used for
- Sending and receiving faxes
SignalWire
May process document contentsLegacy fax infrastructure
- Data
- Sender and recipient fax numbers and document contents
- Used for
- Faxes routed over legacy numbers
Google Cloud Vision
May process document contentsReading text from received faxes without a usable text layer
- Data
- Document page images
- Used for
- Received-fax text recognition, where configured
OpenAI
May process document contentsData extraction and summaries for received faxes; AI drafting and analysis you request
- Data
- Document text and details you enter
- Used for
- Received-fax summaries and extraction where enabled; prior-authorization and clinical-note AI tools when you use them
Resend
May process document contentsTransactional email
- Data
- Recipient email address, message contents and any attachments included in a requested email
- Used for
- Receipts, delivery notices, reminders and account messages
Mailjet
May process document contentsFallback transactional email
- Data
- Recipient email address, message contents and any attachments included in a requested email
- Used for
- Only when the primary email provider fails
Stripe
Payment processing
- Data
- Payment details and email address
- Used for
- Purchases and subscriptions
Google
Optional sign-in
- Data
- Name and email address
- Used for
- Signing in with Google
Providers may process data in the United States or other countries where they operate. See the Privacy Policy for how FaxSeal collects, uses and retains data.