What Is an Electronic Signature?
An electronic signature is any electronic process that signals a person's intent to agree to the content of a document. Under the ESIGN Act (United States) and eIDAS Regulation (European Union), a valid electronic signature can be as simple as typing your name, checking a box, or drawing your signature with a mouse or stylus.
The key legal requirement is intent: the signer must deliberately indicate agreement. A mere click of "I Agree" on a terms-of-service page counts. So does a drawn signature captured by a tool like ProPDFSuite.
Electronic Signatures vs. Digital Signatures
These terms are often used interchangeably but they are technically distinct:
- Electronic signature (e-signature): A broad category covering any electronic indication of intent. Fast to apply, legally sufficient for most business documents.
- Digital signature: A specific cryptographic mechanism that uses a certificate authority (CA) to bind the signature to the signer's identity. Required for government filings, court submissions, and certain regulated industries.
For the vast majority of business use cases (contracts, NDAs, offer letters, purchase orders, approvals), an e-signature is legally sufficient and far simpler to use.
Legal Validity of E-Signatures in 2026
United States
The ESIGN Act (2000) and UETA (adopted by 49 states) establish that electronic signatures are legally equivalent to handwritten signatures for most commercial transactions. Exceptions include wills, court orders, and certain real-estate transactions that still require wet ink.
European Union
The eIDAS Regulation (updated in 2024 under eIDAS 2.0) creates three tiers of e-signature:
- Simple Electronic Signature (SES): Suitable for low-risk documents
- Advanced Electronic Signature (AES): Uniquely linked to the signer; detects alterations; suitable for most contracts
- Qualified Electronic Signature (QES): Highest level; requires a qualified certificate from an approved trust service provider; legally equivalent to a handwritten signature throughout the EU
Rest of World
As of 2026, over 60 countries have enacted e-signature legislation. Canada (PIPEDA), Australia (Electronic Transactions Act), Singapore (ETA), and the UK (Electronic Communications Act) all recognize e-signatures for standard commercial transactions.
When E-Signatures Are Legally Sufficient
E-signatures work for:
- Employment contracts and offer letters
- Non-disclosure agreements (NDAs)
- Sales contracts and purchase orders
- Software and SaaS subscription agreements
- Lease agreements (most jurisdictions)
- Financial services agreements
- Healthcare consent forms (with HIPAA-compliant workflows)
E-signatures are typically not suitable for:
- Wills and testamentary documents
- Adoption and family law court orders
- Notarized documents (without eNotarization)
- Documents requiring a government seal
How to Sign a PDF Electronically with ProPDFSuite
Draw Your Signature
Open any PDF in ProPDFSuite and click the Signature tool in the toolbar. A modal opens with three options: draw, type, or upload an image of your signature. The draw tool captures your natural signature using pressure-sensitive input on tablets, or standard mouse input on desktop.
Type Your Signature
Choose from a curated set of handwriting-style fonts that render your typed name as a natural-looking signature. This method is fully legally binding under ESIGN and eIDAS SES.
Place and Resize
Your signature is placed as a transparent PNG layer above the PDF content. Drag it to the signature line, resize using the corner handles, and it is saved automatically. You can add multiple signatures and initials to different pages.
Download or Share
Once signed, download the PDF directly or share it with a link that expires after a configurable period. The signed document includes an audit trail appended to the final page showing the signer's IP address, timestamp, and email.
Building a Signature Workflow for Your Team
ProPDFSuite Pro supports multi-party signature workflows. Here is a typical pattern:
- Upload the contract to ProPDFSuite and open the editor
- Place signature placeholder fields for each signer
- Invite signers by email, and each receives a unique signing link
- Set signing order if sequential signing is required
- ProPDFSuite notifies each signer when it is their turn
- Once all signers have completed, the fully executed document is emailed to all parties
Audit Trails and Compliance
ProPDFSuite captures an immutable audit trail for every signing event, including:
- Timestamp (UTC) of each signature
- Signer's IP address and approximate geolocation
- Email address and authentication method
- Document hash before and after signing
This audit data is appended to the signed PDF and also stored in your ProPDFSuite account for 7 years under Pro and Enterprise plans, satisfying most regulatory retention requirements.
Start Signing Documents Today
You do not need expensive software or a complex workflow setup to start collecting legally binding signatures. Try the signing tool right now, no account required. Upload, sign, and preview for free. Pay just $2.99 per document when you are ready to download, or sign up for a Pro plan for unlimited downloads.