Quick answer: To sign a PDF for free, open it in an online Sign PDF tool, draw, type or upload your signature, click where it should go, adjust the size and download the signed file. No printing or scanning is needed. Simple electronic signatures are accepted for many documents, but some legal papers need a witnessed or certified signature.
Someone emails you a contract, rental agreement or school form and asks you to “sign and send back”. You do not need a printer and scanner. In this guide you will learn how to add your signature to a PDF on any device, what an electronic signature can and cannot do, and how to keep your documents safe. The fastest way is our free Sign PDF tool, which works in your browser.
Is an electronic signature legally valid?
In many countries, yes — for many everyday documents. Two well-known examples:
- United States: the ESIGN Act, signed into law on 30 June 2000, gives electronic records and signatures legal validity for transactions in interstate and foreign commerce, as summarised by the FDIC. It defines an electronic signature broadly as a sound, symbol or process attached to a record and adopted with the intent to sign.
- European Union: the eIDAS Regulation recognises three levels — simple, advanced and qualified electronic signatures. The European Commission notes that only qualified signatures are explicitly recognised as equivalent to handwritten signatures across the EU.
Many other countries, including Pakistan (Electronic Transactions Ordinance 2002), have their own e-signature laws. However, some documents — such as wills, certain property transfers and court papers — may require a handwritten, witnessed or certified signature. When in doubt, ask the person who sent you the document what they accept. This is general information, not legal advice.
How to sign a PDF online for free
- Open the Sign PDF tool and choose your PDF.
- Create your signature: Draw it with your mouse or finger, Type your name in a handwriting style, or Upload a photo of your signature on white paper.
- Click or tap on the page where you want to sign. Drag the signature into place and use the size slider.
- Use Next page to sign other pages, and tick Add today’s date if the form needs a date.
- Press Download signed PDF and send the file back.
The PDF is processed on your device and is not uploaded to our server, which matters for contracts and ID documents.
Making a signature image that looks real
Sign your name in dark ink on plain white paper, take a well-lit photo straight from above, and upload it. The tool makes the white background transparent so only the ink appears on the document. Crop the photo first with our Crop Image tool if there is a lot of empty space.
How to sign a PDF on iPhone and Android
The online tool works in Safari and Chrome on phones: draw your signature with your finger, then tap the page to place it. iPhone users can also use the built-in Markup feature in the Files or Mail app (open the PDF, tap the Markup icon, then the plus button and Signature). Many Android phones offer a similar option in their PDF viewer or in Google Drive’s annotation tools, depending on the device.
How to sign a PDF on Windows and Mac
- Mac: open the PDF in Preview, click the Markup toolbar and choose Sign. You can create a signature with the trackpad or your iPhone camera.
- Windows: Adobe Acrobat Reader includes a free “Fill & Sign” option. Microsoft Edge can also draw on PDFs.
- Any computer: our browser tool works the same on Windows, Mac, Linux and Chromebook without installing anything.
Electronic vs digital signatures
| Electronic signature | Certificate-based digital signature | |
|---|---|---|
| What it is | An image or typed name added to the document | A cryptographic seal using a certificate tied to your identity |
| Proves who signed? | Weakly — relies on context, email trail | Strongly, via the certificate |
| Detects later changes? | No | Yes |
| Typical use | Forms, agreements, offer letters, invoices | Government filings, regulated industries, qualified e-signatures |
| Cost | Free | Usually requires a paid certificate or service |
Our Sign PDF tool creates a visual electronic signature. If your bank, court or government office asks for a “digital signature” or “qualified signature”, you will need a certificate-based service they accept.
Tips for signing documents safely
- Read before you sign. Check names, dates, amounts and the number of pages.
- Use tools that do not upload your files — or check how long a service keeps them.
- Keep a copy of the signed PDF and the email you sent it with.
- Do not leave blank spaces that someone could fill in later; write “N/A” where needed.
- Protect your signature image. Do not post it publicly or send it to people you do not trust.
- Reduce file size before emailing large scans with Compress PDF, and combine several signed files with Merge PDF.
Frequently asked questions
Can I sign a PDF without Adobe?
Yes. Browser tools like ours, Preview on Mac and Markup on iPhone all sign PDFs without Adobe software.
Is a typed name a valid signature?
In many places a typed name can count as a simple electronic signature if it shows your intent to sign, but requirements vary. Some organisations prefer a drawn signature.
Can I sign a password-protected PDF?
You need to unlock it first with the password. Restricted PDFs may not allow changes at all; ask the sender for an editable copy.
How do I add a signature to every page?
Place your signature on page 1, then use Next page and tap to add it on each other page before you download.
Keep reading: related guides
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