A manager asks you to sign a contract on their behalf. They are traveling, unavailable, or have delegated signing authority to you. You have the document. You have the authorization. But the signature line asks for their name, not yours. Signing someone else name on a PDF, even with their permission, raises legal questions that depend on the type of signature, the jurisdiction, and the specific authorization you received. The answer is not a simple yes or no. It depends on whether you are applying an electronic signature or a digital signature, whether you are signing in your own name on their behalf or signing their name directly, and what documentation exists to prove the authorization.
This guide covers the legal framework for signing on behalf of someone else, the practical methods for doing so correctly, and the documentation that protects both you and the person you are signing for.
Under agency law in most jurisdictions, a person authorized to act on behalf of another, known as an agent, can sign documents in that capacity. The signature binds the principal, not the agent. The authority must exist. The signature must indicate the agency relationship.
The Agency Principle: Signing as Agent, Not as Impersonator
When you sign on behalf of someone else, you are signing as their agent, not impersonating them. The signature should make the agency relationship clear. The correct format for an agent signature is the principal name, followed by the agent name and the agency capacity. For example, "Acme Corporation, by Jane Smith, authorized representative" or "John Doe, by Jane Smith, under power of attorney." This format tells the recipient that the signature was applied by an agent with proper authority using WukongPDF PDF Legal signing tools with proper authority.
The Sign PDF method for agency signatures should use your own signature, not a copy of the principal signature. Signing the principal name directly, even with permission, creates a document that falsely appears to have been signed by the principal personally. This is legally problematic and may constitute forgery in some jurisdictions even with verbal permission.
Documenting the Authorization
Before signing on behalf of someone else, obtain written authorization. An email from the principal stating that you are authorized to sign the specific document is sufficient for most business purposes. For higher-stakes documents, such as contracts above a certain value or legal filings, a formal power of attorney or a corporate resolution authorizing you to sign may be required. The documentation should identify the document, state that you are authorized to sign it, and be dated contemporaneously with the signing.
Store the authorization with the signed document. The PDF Security audit trail for an agency signature includes both the signed document and the authorization that empowered you to sign it. Without the authorization, a challenge to the signature validity leaves you with no evidence of your authority.
Electronic vs Digital Signatures for Agency Signing
An electronic signature, drawn or typed in the signature field, can be applied by an agent in the agency format described above. A digital signature backed by a certificate presents a complication. The certificate is issued to an individual. The digital signature will identify you, the agent, as the signer. This is technically correct because you did sign the document. However, the recipient may expect the principal identity on the signature. Clarify in accompanying correspondence that the document is signed by an authorized agent.
The PDF Legal best practice for agency digital signatures is to sign with your own certificate and include the agency capacity in the signature appearance. The signature panel shows your verified identity. The signature text shows you signed as agent. Both are accurate and verifiable.
When Not to Sign on Behalf of Someone Else
Do not sign on behalf of someone else if you do not have clear, documented authorization. Do not sign if the document requires notarization and you are not appearing before a notary as the authorized agent. Do not sign if the document specifically requires the personal signature of the principal and does not permit agency signing. These situations require the principal to sign personally. Your signature, even with authorization, will not satisfy the requirement.
The Sign PDF agency workflow is legally valid when properly authorized and properly formatted. It is legally risky when done without authorization or with a signature format that obscures the agency relationship.
Corporate Signing Authority and Delegation Policies
Most organizations have policies governing who can sign what. A CEO can sign anything. A department head can sign documents within their department. A manager can sign routine operational documents. The policy should be documented and accessible. When you sign on behalf of someone else, your authority derives from this policy. If challenged, you can reference the policy that authorized you.
If your organization lacks a signing authority policy, request that one be created. The PDF Legal framework for corporate signing is built on delegated authority. The policy documents the delegation.
Electronic vs Wet-Ink Signature Requirements by Document Type
Some documents legally require a wet-ink signature regardless of electronic signature laws. Real estate deeds in many jurisdictions. Wills and trusts. Certain family law documents. These documents cannot be signed electronically, by an agent or by the principal. Check the requirements for your specific document type and jurisdiction before using an electronic signature.
The Sign PDF workflow is not a universal replacement for physical signatures. Know which documents require ink before applying an electronic signature.
The Difference Between Authorization and Ratification
Authorization is permission given before you sign. Ratification is approval given after you sign. If you sign without prior authorization but the principal later ratifies your signature, the signature may become legally valid retroactively. However, ratification is not guaranteed. The principal may choose not to ratify, leaving you personally exposed for signing without authority.
Obtain authorization before signing. Do not rely on ratification after the fact. The PDF Legal framework for agency signing is built on prior authorization. Ratification is a safety net for emergencies, not a standard workflow.
Signing on Behalf of an Organization vs an Individual
Signing for a corporation is different from signing for a person. A corporation acts through its authorized representatives. Your signature binds the corporation if you hold the appropriate position or have been delegated signing authority. Signing for an individual requires that individual specific authorization, typically through a power of attorney. The legal standard for corporate agency is generally more flexible than for personal agency.
Verify whether you are signing for an organization or an individual. The Sign PDF authority requirements differ between the two. Corporate signing is governed by organizational policy. Individual signing is governed by personal authorization.