New

E-signatures for any business, with an API when you need one.

Use CT Signature as a ready-to-go web app — real estate, HR, agencies, contractors, any industry that needs legally-binding signatures. Or plug into the API to embed signing in your own product. No sales calls, no per-seat gotchas.

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REST
Clean JSON API
Iframe
Embedded signing
Webhooks
Real-time events
POST /v1/envelopes 
curl https://api.ct-signature.com/v1/envelopes \
  -H "Authorization: Bearer ct_sk_live_..." \
  -H "Content-Type: application/json" \
  -d '{
    "template_id": "tpl_offer_letter",
    "signers": [
      { "name": "Jane Doe",
        "email": "jane@acme.com",
        "order": 1 }
    ],
    "redirect_url": "https://app.example.com/signed",
    "webhook_url": "https://api.example.com/hooks/ct"
  }'
Why CT Signature

A clean, modern signing experience without enterprise overhead.

CT Signature gives any business — and any developer — a clean signing experience, reusable templates, and transparent hybrid pricing. Sign up, send a document, and you're done. Or embed it in your product via API. Your choice.

Two ways to use it
  • Web app — sign up, upload a document, send for signature. No setup.
  • Developer API — embed signing in your product, on your terms.
  • Self-service onboarding — no sales call required
  • Subscription tiers plus transparent pay-as-you-go overage
  • Multi-tenant from day one, with strict data isolation
Core capabilities

Everything you need to ship signing in an afternoon.

Visual field placement

Drag-and-drop signature, initials, name, date, and stamp fields onto any PDF.

Reusable templates

Upload once, reuse the placement layout for any recipient — perfect for repeatable contracts.

Multi-signer workflows

Independent signing orders and per-signer field assignments. Sequential, parallel, or hybrid.

Embedded or hosted signing

Iframe in your app, or send signers to a hosted page — your choice, per envelope.

Tamper-evident PDFs

Cryptographic hashing, audit logs, and verification — proof that what was signed hasn't changed.

Webhooks

Real-time notifications for signed, expired, completed, and viewed events. Retries built in.

Device + geo capture

Fingerprint and geolocation captured at signing for non-repudiation.

ESIGN / UETA compliance

Consent disclosure tracking, audit trail, identity capture — legally-binding by default in the U.S.

Multi-tenant + roles

Admin and User roles per tenant. Strict data isolation. White-label sender brand.

Built for reliability

Engineered for the reliability legal documents demand.

CT Signature is built on proven, battle-tested foundations — with the developer ergonomics modern teams expect.

Security
Hardened by default
Encrypted storage, token-based auth, strong password hashing
Multi-tenancy
Strict isolation
Each tenant's data is partitioned and access-controlled
Documents
Server-side signing
Tamper-evident PDFs with in-browser rendering
Payments
PCI-compliant
Subscriptions and metered usage handled securely
Email
Reliable delivery
Provider-redundant so notifications reach signers
API
Developer-friendly
Clean, documented endpoints you can integrate in minutes
Built for

Any business that needs a signature.

CT Signature works out of the box for end users in any industry — and offers a developer API for teams that want to embed it.

Real estate

Listing agreements, disclosures, lease docs — signed in the field, on any device.

HR & legal

Offer letters, NDAs, contracts — signed, stored, and fully auditable.

Agencies & contractors

Service agreements, work orders, change orders — sent and signed in minutes.

Small business & solopreneurs

Pay only for what you use. No per-seat traps. No salesperson required.

Healthcare & human services

Consent forms, intake paperwork, releases — collected with audit trails.

Finance & insurance

Applications, policies, claims — signed quickly with identity capture.

SaaS companies

Use the API to embed signing into your product without rolling your own.

Anyone else

If your business needs a signature, CT Signature can handle it.

Use cases by industry

CT Signature for the things people search for.

Deep dives into how teams in different industries put CT Signature to work.

CT Signature

Electronic signature for real estate

Purchase agreements, listing forms, and disclosures from any device.

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CT Signature

E-signature for HR onboarding

Offer letters, NDAs, and onboarding paperwork before day one.

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CT Signature

E-signature for healthcare consent forms

Patient consent, intake, and authorizations under HIPAA-aligned controls.

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CT Signature

E-signature for mortgage and loan documents

Loan applications, disclosures, and amendments — signed on any device.

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CT Signature

E-signature for construction contractors

Service agreements, work orders, change orders, lien releases — from the job site.

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CT Signature

E-signature for nonprofits

Volunteer agreements, donor pledges, and board resolutions — pay-per-envelope.

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CT Signature

E-signature for law firms

Engagement letters, retainers, settlements — with defensible audit evidence.

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CT Signature

E-signature for financial advisors

Client agreements, account opening, IPS — same-day instead of weeks.

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Use cases by capability

For teams looking at specific capabilities.

Deep dives on the features and compliance angles teams shop for directly.

CT Signature

Online document signing for small business

Pay-as-you-go signing without per-seat traps.

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CT Signature

Embeddable e-signature API

REST, iframe, webhooks — embed in your own product.

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CT Signature

White-label e-signature platform

Per-tenant brand, domain, and signing UI — fully branded for your customers.

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CT Signature

Multi-tenant signing platform

Database-layer isolation, scoped API keys, per-tenant audit trails.

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CT Signature

ESIGN Act compliant electronic signature

Consent, intent, identity, association, attribution — built in.

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CT Signature

Tamper-evident e-signature audit trail

Cryptographic document hash + per-action evidence chain on every envelope.

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Start signing today.

Whether you want a ready-to-use signing app or API credentials to embed in your product — get on the early-access list and we'll set you up.

Request early access