Sign PDF · 4 min read

What Is a PDF Digital Signature? How It Differs from E-Signatures

Digital signatures and electronic signatures are often confused but they are technically very different. Understanding the distinction helps you choose the right approach for contracts, forms, and official documents.

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Electronic Signature (e-Signature) — What It Is

An electronic signature is any digital representation of intent to sign — this includes drawing your signature with a mouse or finger, typing your name in a signature box, clicking "I agree," or inserting a scanned signature image. E-signatures are legally valid in most countries under eIDAS (EU) and ESIGN/UETA (US) for everyday documents.

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Digital Signature — What It Is

A digital signature is a cryptographic mechanism — specifically a public-key infrastructure (PKI) certificate embedded in the PDF. It mathematically proves: (1) who signed the document, (2) that the document has not been altered since signing. It requires a certificate from a trusted Certificate Authority (CA). Certified digital signatures are used for financial documents, regulatory filings, and government contracts.

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Which One Do You Need?

For everyday documents — rental agreements, freelance contracts, consent forms, internal approvals — an electronic signature (drawn or typed) is legally sufficient and much simpler. For regulated documents requiring verifiable identity and tamper-evidence — tax submissions, court filings, pharmaceutical batch records — a certified digital signature is required.

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How to Add an Electronic Signature for Free

Go to pdfeditor.onl/sign-pdf. Draw your signature with a mouse or finger, or upload a signature image. Place it on the document and download. This is a legally valid e-signature for most purposes.

Tip: Save a copy of the signed PDF and the original unsigned version. Many jurisdictions require demonstrable signing intent — keeping both files provides a record.

Sign PDF Free — Electronic Signature →

Frequently Asked Questions

Is a drawn signature in the browser legally valid?

In most countries, yes — for private contracts, business agreements, and consent forms. The key legal requirement is signing intent, which a drawn signature demonstrates. Check local regulations for high-stakes transactions.

Do I need a certificate to sign PDFs for business contracts?

For most business contracts, a drawn e-signature is sufficient. Certified digital signatures with PKI certificates are required for specific regulated uses — tax submissions, court documents, and certain financial transactions.

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