Free Ways to Sign a PDF Online in 2026

A PDF landed in your inbox and someone needs it signed. Before you pay for anything, know this: there are several genuinely free ways to sign a PDF in 2026, and the right one depends on a single question -- are you the only person who signs it, or do you need to send it to someone else and get proof they signed it? A quick built-in tool is perfect for one of those jobs and useless for the other, so this guide walks through both honestly and helps you pick the one that fits the document in front of you.

First, One Quick Check

The vast majority of everyday documents -- agreements, authorizations, consent forms, offer letters, applications -- can be signed electronically. Electronic signatures are generally legally binding under the federal ESIGN Act and the Uniform Electronic Transactions Act (UETA) in the United States. That covers most of what lands in a normal inbox.

Still, one message saves a lot of trouble. Check with the requesting party to confirm they accept electronic signatures. If the sender has a specific requirement, a one-line note to confirm is worth the ten seconds it takes.

And a note on what this guide is not: AddSign is a signing tool, not a legal review service. If you are unsure about what a document requires of you, consult a lawyer before signing. What follows is which tool to use, not whether your particular document is one you should sign.

The Two Situations You Might Be In

Almost every signing task falls into one of two buckets, and naming yours first makes the rest of this guide short.

Situation one: you are the only signer. The document needs your signature and nobody else's -- a form you fill in for yourself, a return you sign, a one-sided authorization. You sign it, save it, and send it back or keep it for your records.

Situation two: you need to send it to someone else. Another person has to sign -- a client, a tenant, a contractor, a family member -- and you want a record that they actually did. Think of a lease you send to a renter or an agreement you send to a client.

Situation one is a job for a built-in tool. Situation two is a job for an e-signature service. Here is each.

Free Ways to Sign a PDF You Only Need to Sign Yourself

If you are the only signer, your device probably already has a free tool built in. No account, no upload, no website.

Preview on a Mac

Every Mac ships with Preview, and Preview signs PDFs. Open the file, click the Markup toolbar, choose the signature tool, and either draw on your trackpad or hold a signed piece of paper up to the camera so Preview captures it. Drop the saved signature onto the page, resize, and save. It is fast, offline, and costs nothing.

Markup on an iPhone or iPad

On an iPhone or iPad, open the PDF in Files or straight from Mail, tap the Markup icon, and draw your signature with a finger or Apple Pencil. Position it, save, and send the file back from the same screen. Because the document usually arrives on your phone anyway, this is often the quickest path for a one-signer form.

The Annotate Tools in a PDF Reader

Many free PDF readers on Windows, Mac, and mobile include annotate or fill-and-sign tools that let you draw a signature, type into form fields, and add a date. If you already have a reader you like, check its toolbar before installing anything new -- the feature is frequently already there.

These built-in tools share one honest limitation, and it matters for the next section: what they produce is a drawing on a PDF. Your signature sits on the page as an image. That is completely fine when you are signing for yourself. It becomes a problem the moment you need to prove who signed and when.

Drawing a Signature vs. a Tracked E-Signature

This is the distinction that decides everything. When you draw a signature in Preview or Markup, you are placing a picture of your signature onto a page. The file has a signature on it, but it does not carry any record of the signing event -- nothing that says who applied it, from what device, or at what moment. For your own copy, that is enough.

A tracked e-signature is different. When you sign through an e-signature service, the tool records the event around the signature -- who signed, when they signed, and when the completed document was delivered. That record is the audit trail. It travels with the document and turns "I signed it" into something you can show rather than something you assert.

The difference does not make one approach better than the other. It makes them right for different jobs. A drawn signature fits when you are the only signer and you simply need the page completed. A tracked e-signature fits when someone else signs, or when you might one day need to prove that a signature happened. For the mechanics of placing your own signature on a page, see our guide on how to add your signature to a PDF without printing it.

Free Ways to Sign When You Need to Send a Document

When the document has to go to someone else and come back signed, a built-in tool leaves you emailing a file around and hoping it returns. An e-signature service handles the whole round trip and gives you the proof at the end, and several offer a free tier that covers a real amount of signing.

AddSign is one solid option for this case. The free plan gives you 8 documents per month with no credit card and no expiry, which is enough for the volume most individuals and very small teams actually send. You upload the PDF, mark where the other person signs, and send a link. They open it on their phone, sign in about two minutes, and you get the completed PDF back with an audit trail of the signing. Because it runs in the browser, the person signing installs nothing.

To be even-handed: if you sign for yourself only now and then, a built-in tool is simpler and needs no account. An e-signature service earns its place when you are collecting signatures from others and want a reliable record -- the job built-in tools cannot do.

For a broader walkthrough of the send-and-collect flow, see our complete guide to electronically signing any document.

How to Choose in Ten Seconds

You do not need to weigh features. Just answer the one question:

Only you sign it, and you just need the page completed? Use the built-in tool already on your device -- Preview, Markup, or your PDF reader. Free, offline, instant.
Someone else signs it, or you want proof it was signed? Use a free e-signature service for the round trip and an audit trail at the end.

If you are genuinely unsure which bucket you are in, lean toward the e-signature service. A tracked signature never hurts, and the free tier costs nothing.

Frequently Asked Questions

Is signing a PDF with a free tool legally binding?

Electronic signatures are generally legally binding under the federal ESIGN Act and the Uniform Electronic Transactions Act (UETA) in the United States, whether you draw the signature in a built-in tool or apply it through an e-signature service. Whether an electronic signature is appropriate for your specific document is a separate question for the requesting party, and for a lawyer if you have any doubt.

Do I need to install software to sign a PDF for free?

Usually not. Preview and Markup are already on your Mac and iPhone, and an e-signature service runs in your web browser. For most people, signing a PDF for free involves nothing to download.

What is the difference between the free built-in tools and a free e-signature service?

A built-in tool places a drawn signature on the page and costs nothing, but keeps no record of the signing event. An e-signature service records who signed and when, and handles sending the document to another person and getting it back. Use the first when you sign for yourself, the second when you need proof or a signature from someone else.

How many documents can I sign for free?

With a built-in device tool there is no count -- you sign as many of your own documents as you like. With AddSign's free plan you get 8 documents per month with no credit card required, which covers the sending volume of most individuals and small teams.

This post is for informational purposes only and does not constitute legal advice. Consult a legal professional if you are unsure whether an electronic signature is appropriate for your document.

You don't need an expensive app to sign one document. AddSign is free for individuals.

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