How to Do an Electronic Signature in PDF

How to Do an Electronic Signature in PDF

An electronic signature on a PDF can be added quickly using built-in viewer tools, free web services, or dedicated desktop software. The right method depends on whether you need a simple typed name, a drawn signature, or a legally binding digital certificate.

Using Built-In PDF Tools

Most PDF viewers include a signature feature that lets you type, draw, or upload an image of your signature. In Adobe Acrobat Reader, open the PDF, choose the Fill & Sign tool, click Sign, and then select Type, Draw, or Image. Position the signature where needed and save the file. Preview on macOS offers a similar Sign option under the Annotations toolbar.

Free Online PDF Signing Services

Several reputable websites allow you to upload a PDF and add a signature without installing software. These services typically let you draw your signature with a mouse or trackpad, type a name with a font that mimics handwriting, or upload a scanned image. After placing the signature, you download the signed PDF. Use only HTTPS services that do not store your document longer than necessary.

Desktop Software and Document Editors

Word processors and PDF editors such as Microsoft Word, LibreOffice, or PDF-XChange Editor support signature insertion. In Word, insert a signature line or a scanned signature image, then export or print to PDF. PDF-XChange Editor provides a dedicated Signature tool that can apply a digital signature with a certificate for stronger authentication.

Mobile Signing

Smartphones and tablets can sign PDFs using native apps or cloud services. The Adobe Acrobat app, Apple Files app, and Google Drive all let you open a PDF, tap to sign, and save. A finger or stylus works well for drawing a signature directly on the screen.

Simple vs. Digital Signatures

A simple electronic signature is a visual mark placed on the document. A digital signature uses a certificate-based credential to encrypt a hash of the document, proving authenticity and integrity. For everyday use, a visual signature suffices. For contracts or regulatory filings where non-repudiation matters, use a digital signature backed by a trusted certificate provider.