You can make a document ready for e-signature in just a few minutes using free built-in tools on your computer or a dedicated e-signature platform. The process comes down to three things: preparing your document, adding signature fields or signing it yourself, and sending it to anyone else who needs to sign. Here’s how to do it with whatever tools you have available.
Sign a PDF for Free on a Mac
If you have a Mac, the Preview app handles basic e-signatures without any extra software. Open your PDF in Preview, click the Markup toolbar icon, then click the signature tool. You have three ways to create your signature:
- Trackpad: Sign your name directly on the trackpad with your finger. If your Mac has a Force Touch trackpad, pressing harder creates a heavier, darker line.
- Camera: Write your signature on white paper and hold it up to your Mac’s camera. Preview captures and digitizes it.
- iPhone or iPad: If your device is nearby and connected, you can sign with your finger or an Apple Pencil on the smaller screen, and it transfers to the document automatically.
Once you’ve created a signature, Preview saves it for future use. You just click, drag it onto the document where you want it placed, resize it, and save. This works well for simple situations where you’re the only signer, like returning a signed lease or a permission form.
Sign a PDF on Windows
Windows doesn’t have a built-in signature tool as polished as Preview, but you have options. Microsoft Edge, the default browser, can open PDFs and lets you draw directly on them using the “Draw” tool in the toolbar. You can write your signature with a mouse or stylus, then save the file. It’s not elegant, but it works for basic needs.
For a cleaner result, the free version of Adobe Acrobat Reader includes a “Fill & Sign” feature. Open your PDF, select “Fill & Sign,” then click “Sign yourself.” You can type your name (Acrobat converts it to a script font), draw your signature with a mouse, or upload an image of your handwritten signature. Place it anywhere on the document, save, and you’re done.
Use an E-Signature Platform for Multiple Signers
Free tools work when you’re signing a document yourself, but if you need to send a document out for others to sign, you’ll want a dedicated e-signature platform. Services like DocuSign, Adobe Acrobat Sign, HelloSign, and PandaDoc are built for this. Most offer free tiers or trials with limited monthly sends.
The general workflow is the same across platforms:
- Upload your document. Most platforms accept PDFs, Word files, and sometimes Google Docs. Drag and drop the file or import it from cloud storage.
- Add signer information. Enter the name and email address of each person who needs to sign. If there are multiple signers, you can set the signing order so one person signs before the next receives the document.
- Place signature fields. Drag and drop fields onto the document where each person needs to sign, initial, or enter a date. You can also add text fields for things like printed names, addresses, or custom entries.
- Send the document. Each signer gets an email with a link. They click it, review the document, sign in their browser (no software needed on their end), and submit.
The platform tracks everything automatically. You’ll get a notification each time someone signs, and once all parties have completed their signatures, everyone receives a copy of the finished document.
Create Reusable Templates
If you send the same type of document repeatedly, like an NDA, a client contract, or an invoice, most e-signature platforms let you save templates. You set up the document once with all the signature fields, text fields, and date fields in the right positions. Each time you need to use it, you select the template, enter the new signer’s details, and send. This saves significant time and keeps formatting consistent across every copy.
What Makes an E-Signature Legally Valid
Electronic signatures are legally binding in the United States under the E-Sign Act, a federal law passed in 2000. The law says electronic records and signatures carry the same legal weight as paper and ink, as long as a few conditions are met.
The most important requirement is intent. The signer must clearly intend to sign the document. Clicking an “I agree” button, drawing a signature, or typing a name into a designated signature field all demonstrate intent. A casual mention in an email generally does not. The signer also needs to consent to doing business electronically, and they must have the option to receive a paper version instead.
The other key requirement is record retention. You need to keep an accurate copy of the signed document that stays accessible for as long as the law requires for that type of record. E-signature platforms handle this automatically by storing completed documents in the cloud. If you’re using a free tool like Preview, save the signed PDF somewhere reliable and back it up.
Why Audit Trails Matter
If a signed document is ever disputed, the audit trail is what proves the signature is authentic. E-signature platforms automatically capture metadata each time someone interacts with the document. A proper audit trail includes the date and time of each signature, verification that the signer’s identity was confirmed, a record of any changes made to the document during or after signing, and the IP address of each signer.
This is one of the biggest advantages of using a dedicated platform over a free tool. When you sign a PDF in Preview and email it, there’s no independent record of who signed or when. An e-signature platform creates a tamper-evident certificate of completion that holds up if questions arise later. For anything with real stakes, like a contract, a lease, or a business agreement, this protection is worth the extra step.
Electronic Signatures vs. Digital Signatures
You’ll sometimes see the terms “electronic signature” and “digital signature” used interchangeably, but they’re technically different. An electronic signature is any electronic indication of intent to sign: a typed name, a drawn signature, a clicked button. A digital signature is a more secure subset that uses encryption to verify both the signer’s identity and the document’s integrity.
Digital signatures use a cryptographic process. The software creates a unique fingerprint (called a hash) of the document, encrypts it with the signer’s private key, and attaches it to the file. The recipient can verify the signature using the signer’s public key. If anyone alters even a single character in the document after signing, the hash won’t match and the tampering is immediately detectable.
Digital signatures also provide non-repudiation, meaning the signer can’t credibly claim they didn’t sign, because only their private key could have created that specific signature. Basic electronic signatures rely on simpler verification methods like email confirmation or two-factor authentication, which may not offer the same level of proof.
For most everyday documents, a standard electronic signature through a reputable platform is sufficient. Digital signatures with certificate-based encryption are typically used in industries with strict regulatory requirements, like government contracts, financial services, or healthcare.
Setting Up Notifications and Reminders
One practical advantage of e-signature platforms is automated follow-up. When you send a document for signature, the platform can automatically remind signers who haven’t completed their portion after a set period. You can usually customize how frequently reminders go out and set a deadline after which the signing link expires. This eliminates the awkward back-and-forth of chasing people down to sign paperwork, and it keeps deals and agreements moving on schedule.