How SignSenders Works
A straightforward 4-step workflow for freelancers to draft, send, and get agreements electronically signed with OTP + WebAuthn biometric verification.
How does SignSenders work for freelancers and clients?
SignSenders is an online platform that helps freelancers create, send, and electronically sign contracts with clients using a 4-step workflow: draft the contract, dispatch the signing link, verify the client using an out-of-band 6-digit OTP + WebAuthn biometric authentication (Face ID, Touch ID, Windows Hello), and generate a tamper-evident signed PDF with an immutable cryptographic audit certificate.
- 1Create or customize a contract with pre-built freelance clauses.
- 2Send the contract link to the client's email.
- 3Share the private 6-digit OTP with your client via WhatsApp, SMS, or Slack.
- 4The client enters the OTP and authenticates with Face ID, Touch ID, or Windows Hello.
- 5The completed, SHA-256 sealed signed PDF with biometric audit trail is generated.
Important Product Scope: SignSenders facilitates contract creation and electronic signing. It does not negotiate freelance deals, process or escrow payments, guarantee client payment, resolve legal disputes, provide legal representation.
The 4-Step Signing Workflow
From blank draft to legally executed, biometrically sealed PDF in under three minutes.
Create & Customize Your Agreement
Choose from pre-built freelancer clauses (Scope of Work, Payment Terms, IP Ownership, NDA, Kill Fee, Liability) or type your custom terms in seconds.
- Pre-built legal clause library
- Clear scope of work, deliverable deadlines, and payment schedules
- Automatic live formatting and preview before sending
Dispatch Secure Signing Link & Private OTP
Send the contract to your client's email with 1 click. SignSenders generates a private 6-digit verification code for you to share out-of-band.
- Instant delivery to your client's inbox
- Private 6-digit code shown in your dashboard
- Share code via WhatsApp, SMS, Slack, or phone call for out-of-band verification
Client Verifies with OTP & Biometrics
Your client opens the link, enters the 6-digit code, and authenticates via Face ID, Touch ID, or Windows Hello to cryptographically bind their signature.
- Zero account registration required for clients
- Hardware-backed WebAuthn biometric verification (Face ID / Touch ID / Windows Hello)
- Desktop QR code handoff for seamless smartphone biometric scanning
Download SHA-256 Sealed PDF & Audit Certificate
Once signed, SignSenders compiles a court-admissible audit certificate stamped with client IP, timestamp, device user-agent, and WebAuthn cryptographic proof.
- Tamper-evident PDF compilation with pdf-lib
- Records Credential ID, AAGUID, and signature algorithm for legal non-repudiation
- Permanent, secure record accessible anytime from your dashboard
Dual-Layer Security: Out-of-Band OTP + Hardware Biometrics
Traditional e-signature platforms send a signing link directly to an email inbox. If an inbox is compromised, forwarded, or accessed by assistants, unauthorized signatures can occur.
SignSenders solves this by combining out-of-band 6-digit OTP delivery (WhatsApp/SMS) with FIDO2 / WebAuthn hardware biometric verification (Face ID, Touch ID, Windows Hello). The client's physical device creates a cryptographic proof bound to the agreement, providing court-admissible non-repudiation under the IT Act, 2000.
Brute-force protection blocks repeated invalid code entries.
Tamper-proof cryptographic seal embedded in the PDF.
Meets electronic signature requirements with full audit certificates.
Frequently Asked Questions
Direct, transparent answers about SignSenders contract workflows, verification, and pricing.
Ready to create and sign your next contract?
Join independent freelancers using SignSenders. Get 1 free contract credit upon signing up, then pay as you go at ₹149 per contract.