Editor’s Picks

Read the collection of the best and most-read articles on the signNow blog
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Learn what you can safely edit on a signed PDF, when it invalidates the signature, and the compliant way to make changes with SignNow.
Editor’s Picks, How-to Guides
How to edit a signed PDF: Options, limits, and best practices
Quick answer: Editing a signed PDF is possible, but only within limits: some changes leave the signature intact, and others invalidate it the moment you save. A digitally signed ...
A blue blog thumbnail image with graphic elements and text: How to add a signature to a PDF.
Editor’s Picks, How-to Guides
How to add a signature to a PDF: Type, draw, or upload
There are three ways to add a signature to a PDF in SignNow: type it out, draw it with a mouse or finger, or upload an image of a ...
A cover image for the SignNow blog article "How to sign as power of attorney?".
Editor’s Picks, How-to Guides
How to sign as power of attorney: The correct format for every document type
Signing as power of attorney (POA) requires three elements: the principal’s name, your name, and a word or phrase that identifies your role as agent. Think of it like ...
A grey blog thumbnail image with graphics and text: What is a promissory note.
Digital Evolution, Editor’s Picks
What is a promissory note? Legal requirements, common types, and how it works
A promissory note is a signed, written promise. One party agrees to pay a specific sum to another, on demand or by a set date. It differs from a ...
Learn how to add a digital signature to a PDF in four steps
Editor’s Picks, How-to Guides
How to add a digital signature to a PDF in 4 steps
Quick answer: You can add a digital signature to a PDF with a certificate-based tool or a cloud eSignature platform, and which one fits depends on whether you’re signing ...
A grey blog thumbnail image with graphic elements and text: Executive summary template.
Editor’s Picks, Productivity
Executive summary template: How to write one, examples and a free template
An executive summary, similar to a movie preview or book synopsis, gives an overview of your project or business plan, making it easier for stakeholders to grasp the key ...
A cover image for the SignNow blog article "What is a power of attorney?".
Digital Evolution, Editor’s Picks
What is a power of attorney, and how does it work for signing documents?
Power of attorney (POA) is a legal document that lets one person, the principal, authorize another person, the agent or attorney-in-fact, to act on their behalf. It can cover ...
Learn what an NDA is, what types exist, and how long does one last.
Editor’s Picks, Productivity
What is an NDA? Non-disclosure agreements explained
Quick answer: A non-disclosure agreement (NDA) is a legally binding contract that creates a confidential relationship between parties sharing sensitive information, and it is one of the most common ...
A cover image for the SignNow blog article "What is an affidavit? Definition, use cases, and how to sign one properly".
Editor’s Picks, Productivity
What is affidavit? Definition, common uses, and how to sign one properly
 An affidavit is a written statement of fact that the signer, called the affiant, swears or affirms to be true in front of a notary public or another official ...
A blue blog thumbnail image with graphic elements and text: What is a notary public?
Digital Evolution, Editor’s Picks
What Is a Notary Public? Role, responsibilities, and when you need one
A notary public is a state-appointed official authorized to witness the signing of important documents and verify the identity and willingness of the people signing them. Think of a ...
A cover image for the SignNow blog article "What is a digital signature?"
Digital Evolution, Editor’s Picks
What is a digital signature: 2026 guide
Quick answer: A digital signature is a cryptographic mechanism, built on public key infrastructure (PKI), that verifies both a signer’s identity and the integrity of a signed document. It ...
A gray, blue, and white blog thumbnail image with graphic elements and text: What is an NDA? Types, uses, and why eSignatures make them easier.
Digital Evolution, Editor’s Picks
What is an NDA? Types, uses, and why eSignatures make them easier
A non-disclosure agreement (NDA) is a legal contract in which one or both parties involved agree not to share specified confidential information with anyone outside the agreement. Think of ...

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How the signNow API maintains security with HMAC
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Developers, Editor’s Picks
How to add signature fields and set signing roles using the signNow API
signNow’s signature fields allow for faster document approval collection from signers while significantly decreasing the chance of human error. Using predefined signature fields helps improve document accuracy. Every signer ...