Signing a PDF should take thirty seconds, and usually it does. The confusing part isn’t the how — it’s knowing whether the signature you just added actually counts. “Electronic signature,” “digital signature,” “e-sign” and “digital certificate” get thrown around as if they mean the same thing, and they don’t. This guide shows you how to sign a PDF for free — by drawing or typing your signature — then explains — in plain language — what kind of signature you’re creating and when you’d need something stronger. (One note up front: this is general information, not legal advice.)
Two ways to sign a PDF
Ream’s Sign PDF lets you add your signature without printing, scanning or installing anything. Open your document in the browser and choose the style that suits you:
- Draw it. Sign with your mouse, trackpad or — best of all — your finger on a phone or tablet. This gives the most natural, handwritten look.
- Type it. Enter your name and it’s rendered in a signature-style script. Fast, clean and legible.
Then position the signature where it belongs, resize it to fit the line, add the date or your initials with the text tool if you need to, and download the signed PDF. The whole thing takes under a minute.
Electronic vs digital signature: the difference that trips everyone up
Here’s the distinction that clears up most of the confusion. A digital signature is always electronic, but an electronic signature is not always digital. “Electronic signature” is the broad category — any mark you apply to show intent to sign. “Digital signature” is a specific, high-security subset built on cryptography.
| Electronic signature | Digital signature | |
|---|---|---|
| What it is | A drawn, typed or image signature placed on the page | A cryptographic certificate embedded in the file |
| What it proves | Intent to sign | Signer identity and that the file is unchanged |
| Security | Basic — no built-in tamper check | Strong — any later edit breaks the seal |
| Typical use | Everyday agreements, forms, internal docs | Regulated, legal or high-value transactions |
When you sign with Sign PDF, you’re creating an electronic signature — a visible mark showing you signed. That’s exactly what the vast majority of documents call for. A digital signature, by contrast, uses an encrypted certificate to bind your identity to the file and detect any change made afterwards; it’s what you’d use for things like regulated filings or contracts that demand cryptographic proof.
Is an electronic signature legally binding?
In most everyday situations, yes. In the United States, the federal ESIGN Act and the state-level UETA give electronic signatures the same legal standing as ink on paper, provided the basics are met: both parties intend to sign, both consent to doing it electronically, the signature is clearly linked to the person, and a copy of the record is kept. In the EU and UK, the eIDAS regulation recognises electronic signatures too, with tiers of increasing assurance (simple, advanced and qualified). A typed or drawn signature on a PDF is generally a valid “simple” electronic signature.
What a simple electronic signature doesn’t come with is a built-in audit trail — a timestamped, verified record of who signed, from where, and that they are who they claim to be. For a birthday-party waiver or an internal sign-off, you don’t need one. For a six-figure contract or anything a court might scrutinise, you might. That’s the honest dividing line.
Not legal advice: whether a particular signature is sufficient depends on the document, the jurisdiction and the stakes. For anything high-value or regulated, check the specific requirements — or ask a professional — before you rely on it.
When you need more than a simple signature
Reach for something stronger than a placed-image signature when the situation demands verifiable proof:
- You need an audit trail. A dedicated e-signature service (the DocuSign-style platforms) records each signer’s identity, email, IP and timestamp, and locks the document afterwards. Use one when you may have to prove who signed and when.
- You need tamper-evidence. A true digital signature with a certificate will flag if even one character changes after signing. Essential where document integrity is legally required.
- It’s regulated or qualified. Some transactions (certain EU filings, for example) require a “qualified” electronic signature issued by an accredited provider. No free tool can create one.
For everything below that bar — the great majority of what people sign day to day — a clean electronic signature on the page is the right, fast, free choice.
Signing on your phone
Signing with your finger on a touchscreen produces the most natural-looking signature, and because Sign PDF runs in the browser, there’s no app to install. Open the page in Safari or Chrome, load your PDF, choose Draw, sign with your fingertip, place it, and download. It’s often quicker and tidier than the print-sign-scan routine, and there’s no scanner involved.
Don’t forget the rest of the form
A signature is usually the last step, not the only one. If your document also needs a date, initials, a printed name or ticked checkboxes, add them with Edit PDF — drop in text boxes and small marks wherever the blanks are. Our guide to filling out a PDF form — even one that isn’t fillable — covers the whole process in detail.
Is it private, and is it free?
Yes to both. Sign PDF works entirely in your browser. Your signature and your document never leave your device — nothing is uploaded, nothing is stored, and there’s no account to create. Given that you’re often signing something personal or confidential, keeping the whole process on your own machine is exactly how it should work. It’s free, with no watermark on your signed file.
Frequently asked questions
Is a typed or drawn signature legally valid? In most everyday cases, yes — ESIGN and UETA (US) and eIDAS (EU/UK) recognise electronic signatures. For high-value or regulated documents, confirm the specific requirements first.
What’s the difference between an electronic and a digital signature? An electronic signature is any mark showing intent to sign. A digital signature is a specific type that uses a cryptographic certificate to verify identity and detect changes to the file.
Does signing on Ream add an audit trail? No — it applies a visible electronic signature. If you need a verified, timestamped record of who signed, use a dedicated e-signature service.
Can I sign a PDF on my iPhone or Android? Yes. Open Sign PDF in your mobile browser and draw your signature with your finger — no app needed.
How do I add the date or my initials? After placing your signature, use the text tool to type the date, your initials or a printed name, and drop it wherever the form needs it.
Is my signature uploaded anywhere? No. Sign PDF runs in your browser, so your signature and document stay on your device — nothing is uploaded or stored.
Can I reuse the same signature next time? Each session you draw or type it fresh (nothing is saved on our side, by design). It takes only a few seconds, and drawing on a touchscreen gives the most consistent result.
Is it free? Yes — free, no sign-up, and no watermark on your document.
For the documents most of us sign — agreements, forms, letters, waivers — a drawn or typed electronic signature is legitimate, accepted and takes under a minute. Save the certificates and audit-trail services for the moments that genuinely need them, and don’t let the jargon slow down the other 95%. Open Sign PDF, add your name, and you’re done.
