Digital signature with FinanceID*. In under a minute.

Upload the file, position the signature, and complete it with your qualified certificate or via FinanceID. No registration, no installation required.

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PDF XML Word Excel PowerPoint ODT + more

Self-contained documents, with high encryption standards and full legal validity.

How it works
1Upload

Upload the document that needs to be signed.

2Position

Drag the signature stamp to where it should appear.

3Authenticate

Choose your identity provider.

4Done

Download the signed document with full legal validity.

5Share

Optional. Send the signing link to other signers — each one signs directly in the browser, no account required.

*You can use Pix to sign via FinanceID

01Why Rubrix

Four reasons legal, HR, and operations teams adopt Rubrix with confidence.

Digital signatures, not electronic

While most platforms use simple electronic signatures, every signature on Rubrix is backed by a digital certificate — the same standard used by the federal government and the banking system. Full legal validity.

Certificate on every signature

The best price on the market

We charge a fraction of what other platforms charge for the same service. No dollar exposure, no end-of-month surprises.

Best value

Speed with FinanceID

Anyone with a bank account can sign a document in seconds. No app to install, no account to create, no prior certificate required. Open the link, review, scan the QR code, confirm a symbolic R$ 0.01 Pix transaction — signed.

Anyone can sign

Simple integration

Well-documented REST API. Automate workflows from your ERP or connect with N8N, Make, and Zapier without writing code.

REST API available
02Sign via FinanceID

FinanceID is the new identity.

Patented process

Everyone with a bank account has already gone through identity verification. It's the KYC the financial system requires for any transaction. FinanceID, a technology patented by Rubrix, puts that confirmation to work for anyone who needs to sign.

By scanning the QR code in their banking app and confirming a symbolic R$ 0.01 Pix transaction, the signer is identifying themselves — not just paying. The financial act is the act of identification. The signature is the consequence.

AC Rubrix issues a single-use certificate in the signer's name and signs the document. In seconds, with no installation, no prior certificate required.

Anyone with a bank account can sign with full legal validity — no digital certificate of their own needed.

See a demonstration →
Bank • Payments
Sign contract
Service agreement — João Silva
Confirmation R$ 0.01
Confirm with biometrics
03Team

Built by the team that built digital signing in production.

The Rubrix team brings over two decades of experience conceiving, building, and operating digital signature infrastructures in high-scale, mission-critical environments. Now that technology is available to any organization.

Photo of Anthony Kamers

Anthony Kamers

Over a decade developing and auditing digital signature validation systems at national scale. Specialist in technical compliance and internationally recognized cryptographic standards.

LinkedIn ↗
Photo of Giovani Pieri

Giovani Pieri

Led the development of digital signature platforms used by millions of people. Experience in identity authentication, signing workflows, and integration with Certificate Authorities.

LinkedIn ↗
Photo of Jean E. Martina

Jean E. Martina

PhD from Cambridge. Two decades of research and implementation in applied cryptography and public key infrastructure. Conceived and led PKI projects at continental scale.

LinkedIn ↗
Photo of Lucas M. Palma

Lucas M. Palma

PhD with research in blockchain applied to document traceability and authenticity. Architect of large-scale record integrity systems.

LinkedIn ↗
Photo of Victor Souza

Victor Souza

Led the development of digital signature APIs consumed by critical production systems. Specialist in Certificate Authority integration and identity platform architecture.

LinkedIn ↗
04Methods

Multiple identity providers. One platform.

You don't choose a signing method. You choose how to identify yourself. Rubrix serves everyone from the person with a bank account to the professional with a qualified certificate. The digital signature is the consequence.

FinanceID

Identity via financial transaction

For anyone with a bank account. The signer makes a symbolic R$ 0.01 Pix transaction to confirm who they are: FinanceID validates their identity via banking KYC and issues a single-use certificate. No installation, no prior registration required.

Ideal for: individuals, vendors, end customers
Qualified certificate

Identity via cloud certificate

For those who already have a qualified cloud certificate. Sign directly in the browser, no physical token required. The highest standard of legal equivalency in the countries where we operate.

Ideal for: businesses, accountants, licensed professionals
IDP Gov

LATAM government identity

For public agencies: use IDP Gov as an identification provider (e.g.: Gov.br) and automate internal signing workflows. Contact the team for integration guidance.

Ideal for: city halls, state agencies, public authorities, and federal bodies

In development

  • Physical token certificate 2026 Q3
  • SocialID: Gmail, WhatsApp, GitHub 2026 Q3
  • Corporate authentication 2026 Q4
  • LATAM government identity 2026 Q4
05For developers

One API call.
One complete signing flow.

Simple REST, Bearer token or API key authentication, predictable responses.

Clear, straight-to-the-point documentation with examples in curl, Node, Python, and Go. Or integrate without code using N8N, Make, and Zapier.

One endpoint to start a complete flow — signers, ordering, signing methods, webhooks.

View documentation →
POST rubrix.lat/flow/init 
Authorization: Bearer $RUBRIX_KEY

{
  "document": "{{base64_do_pdf}}",
  "file_name": "contrato.pdf",
  "webhook": "https://seu.site/webhook",
  "pools": [
    {
      "alias": "Signatários",
      "priority": 10,
      "signers": [
        {
          "email": "joao@empresa.com",
          "document": "000.000.000-00",
          "phone": "5548900000000"
        }
      ]
    }
  ]
}
Or without code: N8N Make Zapier
06Rubrix Broker

All identities, one broker.
Rubrix is LATAM.

Digital signing in Latin America runs on five standards: PSC (DOC-ICP-17), Cloud Signature Consortium, IDP Gov LATAM, FinanceID, and Uanataca SignBox. Each with its own specification, session model, and authentication flow. Rubrix implements all five and exposes a single API.

  1. 01 PSC DOC-ICP-17

    The ICP-Brasil standard for cloud certificates. A common interface for all authorized PSCs.

  2. 02 CSC Cloud Signature Consortium

    The international specification for remote signing. The gateway to providers outside Brazil.

  3. 03 IDP Gov LATAM government identity

    Support for government identity providers across Latin America. Rubrix integrates the IDPs of each country without binding to any single national system.

  4. 04 FinanceID Identity via financial transaction

    A process patented by Rubrix: banking KYC converted into digital identity. Currently integrated with Pix; roadmap includes other instant payment methods across LATAM.

  5. 05 Uanataca SignBox — Enterprise API from the Namirial group

    SignBox is Uanataca's enterprise signing API, an eIDAS-qualified provider from the Namirial group. Processing happens locally: only the document hash is sent to the Trusted Service Center. Supports bulk signing, LTV, and timestamping.

07FAQ

Common questions from those evaluating the platform.

Yes. Rubrix signs with qualified certificates recognized in every country where it operates. Each signature carries local legal validity in the signatory's jurisdiction.

FinanceID and other identification methods use a single-use certificate issued by the Rubrix Certificate Authority. These documents have legal validity attested by consolidated court rulings.

An electronic signature is any form of digital acceptance — a click, a drawing on screen, an email. A digital signature uses a cryptographic certificate to guarantee the authenticity and integrity of the document. Rubrix works exclusively with digital signatures, offering the highest level of legal security.

The signatory receives a link, reviews the document and scans a QR Code with their banking app, making a Pix payment of R$ 0.01. FinanceID uses this transaction to confirm identity via banking KYC and issue a single-use certificate through AC Rubrix. The document is signed with that certificate. Takes less than 30 seconds.

FinanceID is a technology patented by Rubrix that converts a financial transaction into digital identity. When someone makes a Pix payment of R$ 0.01, the banking system has already confirmed who that person is. FinanceID uses that confirmation to issue a single-use certificate and sign the document. The act of paying is the act of identifying. The legally binding signature is the consequence.

FinanceID currently operates with Pix. The roadmap includes integration with other instant payment methods across Latin America, extending the same process to any country in the region.

No. Rubrix automatically issues single-use certificates during the signing process, via FinanceID or other identification methods. If you or your signatories already have a qualified cloud certificate, it can also be used in the same flow.

Yes. The digital certificate is embedded in the PDF itself. The proof of authenticity travels with the document and can be verified in any compatible reader (Adobe Reader, gov.br Verifier, LibreOffice) — regardless of whether Rubrix keeps operating. No vendor lock-in.

The platform was developed by the same team responsible for digital signature infrastructures in high-criticality environments. Documents are encrypted at rest and in transit. Rubrix does not store documents — they are available only for the time needed to complete the signing process and are automatically removed after that period. We comply with the legal privacy requirements of every country where we operate, with data processor agreements available for corporate clients.

Yes. To sign a document as a signatory, no account is needed. Just have access to the sent link and an identity provider, such as FinanceID. To create envelopes and send documents for signing, registration is required. Use without an account is controlled by national ID (CPF in Brazil, RUT in Chile and equivalents in other countries). To link your ID to an account, at least one FinanceID authentication is required.

Two modes. In direct mode, you upload the document, sign it and, if you wish, share a link with other signatories — simple, no configuration. In flow mode, you define exactly who signs: add signatories manually, organize them in queues or priority groups, set minimum quorum per group and choose each person's method. Signatories receive notification by WhatsApp and email, and you track progress in real time through the metrics dashboard.

Rubrix is not a storage service. The document is available on the platform for the time needed to complete the signing process. After that period, the file is removed from the servers.

The signed PDF remains valid. The digital certificate is embedded in the file and can be verified in any compatible reader, without depending on Rubrix. We recommend downloading the document as soon as signing is complete.

For long-term archiving with legal compliance, Rubrix LTA will be the dedicated solution. Coming soon.

Sign with Pix. Rubrix.

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REST API available
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