Odoo Sign: Send, Sign, and Approve Documents Online Inside the Odoo Suite

What Is Odoo Sign?

Odoo Sign is the native electronic-signature application inside the Odoo business suite. It lets you sign, send, and approve documents online using electronic signatures, and Odoo states that signatures generated with Sign are considered valid electronic signatures in the European Union and the United States and meet the requirements for electronic signatures in most countries.

Unlike a standalone e-signature tool bolted onto an ERP, Sign is wired into the rest of Odoo. You can prepare a document for one or more signers using drag-and-drop fields, send a one-off document from the Sign app or directly from the chatter of an Odoo record, and build reusable templates for documents you send repeatedly — employment contracts, NDAs, sales quotations, contractor agreements, and onboarding packets.

Sign also supports document envelopes, so you can bundle multiple PDFs into a single signature request and have every signer sign all of them in one structured flow instead of chasing separate files.

Core Features: Templates, Fields, and Envelopes

The day-to-day power of Odoo Sign comes from three building blocks working together.

• →Drag-and-drop field types — Signature, Initial, Text, Multiline Text, Date, Checkbox, Radio, Selection, Strikethrough, and Stamp. Fields are created and edited under Sign → Configuration, and each subsequent Signature field automatically reuses the data entered in the first one so a signer never has to draw their signature twice.
• →Reusable templates — Upload a PDF, drop fields onto it once, and resend it infinitely. Templates are what make repetitive paperwork (offer letters, NDAs, supplier agreements) a one-click operation instead of a manual rebuild every time.
• →Document envelopes — Send multiple documents in a single signature request, created at the upload stage by selecting several PDFs after clicking Upload PDF, with a configurable signing order and a Valid-Until deadline.
• →Auto-complete fields — Configure fields that populate with data from your Odoo database (name, company, email, custom fields) at the moment of signing, reducing manual data entry and typos.
• →Record-anchored signing — Initiate a signature request from the chatter of any Odoo record (sales order, employee, applicant, HR contract) or from the Documents app; when signing completes, the signed PDF and the certificate of completion auto-attach to that same chatter.

Security, Authentication, and the Certificate of Completion

Every completed Odoo Sign transaction produces a tamper-evident audit trail, not just a signed PDF.

When a document is signed, Odoo Sign generates a signatory hash — a unique digital signature of the operation that links the signer's identity to the exact content of the document at the moment of signing. Any change to the document after signing can be detected against that hash.

Each time a document or document envelope is fully signed by all signers, Sign generates a certificate of completion and emails it to every signer along with the fully signed document(s). The certificate includes Document Details (creation time, requester, file name(s), number of signers, and an optional per-page reference hash), a list of Participants with their verification method and unique signatory hash, and timestamped, IP-based, geographically traceable Signing Events and Access Logs.

When a signature request is initiated from an Odoo record's chatter, the certificate of completion and the signed document(s) are also added back to that record's chatter, giving you a permanent, attached audit trail inside the relevant business record.

Signer Verification: From Email to itsme and Aadhaar eSign

Beyond the default email verification, Odoo Sign supports stronger identification methods for higher-stakes documents. These methods require buying credits.

Unique Code via SMS sends a one-time passcode to the signer's phone before they can open the document. itsme® is available for Belgium and the Netherlands (where the itsme® identity service operates) and lets signers authenticate with their existing digital identity, enabled under Sign → Configuration → Settings by activating Identify with itsme®. Aadhaar eSign is the India-specific path, tying the signature to the signer's Aadhaar identity through eMudhra certification.

Aadhaar eSign has specific constraints worth planning around: only one signer per document can be required to authenticate via Aadhaar eSign, and that party must be the last to sign the document. The digital certification from eMudhra is then available inside the downloaded document.

For the strongest, cryptographically-binding signatures, Odoo Sign also supports digital signatures using the user's own digital certificate (.p12 or .pfx file) issued by a Certificate Authority or self-generated. The file holds a private key and a public key, protected by a password that Odoo uses to decrypt the private key at the exact moment of signing. In a multi-company Odoo environment, one cryptographic signing certificate can be uploaded per company.

Legal Compliance: eIDAS, ESIGN, and India's ITA/ICA

Odoo advertises Sign as legally compliant with eIDAS (European Union), the US ESIGN Act (United States), and India's Information Technology Act and Indian Contract Act, as well as most countries' electronic signature laws.

It is important to scope this correctly. Compliance with these frameworks is real and documented, but Odoo Sign's standard signatures fall into the simple-electronic-signature tier, so the actual evidentiary weight of any given signature depends on jurisdiction, document type, and the authentication method used. A signature backed by SMS one-time code, itsme®, or Aadhaar eSign carries stronger identity proofing than a simple email-verified signature, and cryptographic (digital) signing via a CA-issued certificate is the highest tier Sign offers.

For regulated industries that need to satisfy FDA 21 CFR Part 11 or equivalent record-keeping rules, the certificate of completion, signatory hash, and timestamped access logs are what turn a signed PDF into defensible audit evidence.

Odoo Sign vs the Dynamics 365 Equivalent

Dynamics 365 does not ship a single, built-in e-signature app equivalent to Odoo Sign. Instead, it splits the capability across two mechanisms.

Native Dynamics 365 Finance & Operations (Finance and Supply Chain Management) electronic signatures are a built-in compliance feature that confirms the identity of a user starting or approving a computing process inside the ERP. Microsoft notes that in some industries this signature is as legally binding as a handwritten one. It is aimed at regulated industries — pharmaceuticals, food and beverage, aerospace and defense — and is required for compliance with FDA 21 CFR Part 11 in the United States. It uses Microsoft SQL Server features to create certificates and enable signing, so no additional certificate or public key infrastructure (PKI) is required, and every signature is recorded in a database log for audit. Three roles typically interact with it: the electronic signature administrator, the signer, and the electronic signature auditor.

Crucially, Microsoft distinguishes an electronic signature (a substitute for a handwritten signature) from a digital signature (which adds tamper detection and certificate-based verification) — though F&O electronic signatures include built-in digital signature functionality. This native feature is process/transaction signing inside the ERP; it is not designed for sending external contracts to a customer for signature.

For customer-facing document e-signatures, the Dynamics 365 ecosystem relies on third-party add-ins — primarily Adobe Acrobat Sign and DocuSign — installed from Microsoft AppSource and orchestrated through Power Automate. Adobe Acrobat Sign for Dynamics 365 integrates with Dynamics 365 and Power Automate so documents can be sent for e-signature from within Dynamics, with signed documents and audit trails filed automatically back into CRM.

Implementation Considerations for SMEs

For a small or mid-size business evaluating Odoo Sign, the practical questions are about fit and rollout, not features.

If you already run Odoo for HR, Sales, or Documents, Sign is the lowest-friction path: contracts initiated from an applicant's chatter auto-attach their signed offer letter, sales quotations become one-click online signatures, and onboarding packets bundle into a single envelope. The integration cost is effectively zero because Sign is part of the suite.

If you operate in a regulated environment — pharma, food and beverage, aerospace and defense — map your signing workflows to the authentication tier they require. Routine internal approvals can use email verification; customer-facing contracts benefit from SMS one-time codes; Belgian and Dutch agreements can gain strength from itsme®; India-specific workflows lean on Aadhaar eSign; and anything that must satisfy 21 CFR Part 11 or equivalent should combine the certificate of completion with cryptographic signing.

If you operate Dynamics 365 today, the equivalent outcome is achievable but assembled differently: keep native F&O electronic signatures for internal process compliance, and add Adobe Acrobat Sign or DocuSign via Power Automate for external document signing. Both platforms reach the same destination — Odoo ships it natively integrated, Dynamics 365 composes it from native plus ISV.

Either way, an experienced implementation partner keeps the rollout scoped, compliant, and tied to real business records rather than a loose folder of PDFs.