Digital signatures (PAdES / PKI)
Cryptographic PAdES signatures backed by PKI — with PAdES-T timestamps and PAdES-LT long-term validation for signatures that hold up years later.
PAdES · Aadhaar eSign · On-prem
Electronic signatures your legal team will trust.
Upload, sign, and send legally-binding documents in minutes — as an individual or a whole team. Real PAdES digital signatures, Aadhaar eSign, and a tamper-evident audit trail. Free for your first 10 documents every month.
PAdES digital signaturesPAdES-T timestampsPAdES-LT (LTV)Aadhaar eSignSSO + SCIMOn-prem or cloud
Everything you need to sign with confidence
From cryptographic sealing to identity and audit, SignFox covers the full lifecycle of a legally sound signature — without cutting corners on security.
Aadhaar eSign
Signers authenticate with a government-backed identity via Aadhaar OTP — plus SMS one-time codes and a Hindi signer experience, built for India.
Templates & bulk send
Turn recurring documents into reusable templates with placed fields, then send to hundreds of recipients in a single bulk run.
Multi-tenant & SSO
Isolated organizations with per-org branding, OIDC/SAML single sign-on and SCIM provisioning to keep access in lockstep with your directory.
On-prem or cloud
Run SignFox on your own VM — air-gappable, with your keys — or let us operate it as SignFox Cloud. Same platform, your call.
Verifiable audit trail
Every action is written to a tamper-evident audit hash chain, and anyone can independently verify a signed document from a public page.
From draft to sealed in three steps
A workflow your team already understands — with cryptographic rigor underneath every click.
1
Prepare
Upload a document or start from a reusable template, then drag signature, date and text fields exactly where they belong.
2
Send
Add recipients in the order they should sign, set a sequential routing flow, and let automatic reminders keep things moving.
3
Sign & seal
Recipients sign from any device. SignFox applies a PAdES seal and records every step to a tamper-evident audit trail.
Security your auditors will sign off on
SignFox is built security-first — from how keys are held to how every action is recorded and verified.
Encryption at rest
Documents and metadata are encrypted at rest, with transport secured end to end.
PKI / HSM / token signing
Sign with keys held in an HSM or token, so private material never leaves its boundary.
Immutable audit hash chain
Each event is chained to the last, so any change to the record is immediately detectable.
Data residency & on-prem
Keep every document inside your own infrastructure and jurisdiction, air-gapped if needed.
Tamper-evident verification
Anyone can confirm a signed document is authentic and unaltered from a public verify page.
Access control (RBAC, SSO, SCIM)
Role-based permissions with OIDC/SAML sign-on and SCIM provisioning tied to your directory.
Deploy it your way
The same platform, whether you need to keep everything in-house or want us to run it for you.
On-prem VM
Self-hosted, fully under your control.
- Runs inside your own infrastructure
- Air-gappable for restricted networks
- Bring your own signing keys and HSM
- Data never leaves your jurisdiction
SignFox Cloud
Managed for you, ready in minutes.
- Fully managed and operated by SignFox
- Automatic updates and patching
- Backed by an availability SLA
- Scales without extra ops overhead
Simple, honest pricing
Free to start, for individuals and teams alike. No subscriptions, no seat fees, no surprises — pay only for what you use, from a prepaid wallet you control.
Free
₹0
10 documents every month, forever. Individuals and organizations.
- Unlimited team members — no seat fees
- Quick sign: upload a PDF and sign it in minutes
- Reusable templates and bulk send
- PAdES digital signatures + tamper-evident audit trail
- Public document verification
Pay per use
₹10
per document after your 10 free each month
- Aadhaar eSign ₹24 all-inclusive — never uses a free slot
- Aadhaar verification ₹6 per check
- Recharge your wallet with UPI, cards, or netbanking
- Every charge itemized in a transaction ledger
- Prices are per document — not per signer
Enterprise & on-prem
Custom
For regulated teams that need it on their own infrastructure
- Self-hosted VM — air-gappable, your keys, no phone-home
- SSO (OIDC/SAML) + SCIM provisioning
- White-label custom domains
- Offline licensing and signed releases
- Dedicated support
Start with SignFox
Stand up a legally sound signing workflow in minutes — on your infrastructure or ours. Bring your legal team; they’ll approve.