Visual PDF signatures and digital signatures are not the same
A signature that looks handwritten on a PDF can be useful as a visual sign-off, but appearance alone does not verify who placed it or whether the file changed later. Before signing, find out whether the recipient needs a visible mark, an approval record, or a cryptographic digital signature.
What a visual signature adds
A typed name, drawing, or image can be placed on a page so a reader can see a sign-off mark. It may help with drafts, internal review, or a routine form when the people involved have agreed that this is the required method.
The mark is part of the page content. By itself, it does not prove the signer’s identity, record the signing process, or show whether someone changed the PDF after the mark was added.
What a certificate-based digital signature is for
A cryptographic PDF signature uses a digital certificate and signing key to bind a signature to a particular document state. A compatible PDF reader can report whether the signature validates and whether later changes are detected. The result depends on the certificate, key handling, reader support, and the signing workflow.
A signature graphic can be displayed alongside a cryptographic signature, but the graphic alone does not provide those integrity checks. “Electronic signature” and “digital signature” also have legal meanings that can vary by jurisdiction and use case.
Choose the method the recipient actually requires
For a draft that only needs a visible name, a simple appearance may be enough. For a contract, regulated record, or workflow that requires signer verification or tamper evidence, ask the recipient which signing method and audit records they accept before preparing the file.
Do not treat a tool’s download button or a signature-shaped image as proof that a formal signing requirement has been met. This site’s Sign PDF tool creates a basic visible signature appearance, not certificate-based signing or identity verification.
Review the signed copy
Keep an unsigned original, inspect every page where the mark appears, and confirm it does not cover text, a date, a checkbox, or another signature. If you used a signature image, treat that image as sensitive: anyone with a copy may be able to reuse it.
The visible-signature workflow runs in the browser and creates a new PDF. A separate certificate-based service may have different storage, identity, and retention practices, so review those before sending a sensitive document.