Draw, Type or Upload Signature • Legally Compliant • 100% In-Browser Privacy

Sign PDF Online Free - Add Electronic Signature to PDF

Printing out a contract, signing it with a pen, scanning it back to a computer, and emailing it is an outdated, tedious routine. PDFPK’s Sign PDF tool lets you electronically sign documents right from your browser. Draw your signature with your mouse or finger, choose from elegant handwritten cursive fonts, or upload an image of your physical signature, and position it with precision on any page of your document.

How to Use Sign PDF in 4 Simple Steps

Upload Document to Sign

Select the agreement, contract, NDA, or form that requires your signature.

The first page preview loads automatically in the interactive viewer.

Create Your Signature

Draw your signature on the interactive canvas, type your name in cursive, or upload a signature image.

Use a touchscreen or stylus for a natural, authentic signature stroke.

Position & Resize Signature

Click where you want your signature to appear, then drag and resize to fit the signature block.

You can choose which page to sign and adjust the signature stamp dimensions.

Apply & Download Signed PDF

Click "Sign & Download PDF" to embed your signature permanently into the document.

Your signature and document never leave your computer, ensuring 100% privacy.

Why Choose PDFPK for Sign PDF?

Engineered for maximum security, lossless document preservation, and instant client execution.

3 Ways to Sign

Draw your signature freely, type your name with sophisticated cursive fonts, or upload a transparent PNG signature.

Visual Placement & Resize

Position your signature stamp precisely on the designated signature line with live dimensions.

100% Client-Side Privacy

Your signature graphic and document are processed exclusively in your browser memory. Nothing is stored on a server.

Electronic Signature Validity

Complies with general e-signature standards under the US ESIGN Act and European eIDAS regulation for everyday agreements.

Instant Sub-Second Signing

Signs and compiles your document in milliseconds without subscription paywalls or waiting queues.

Touchscreen & Mobile Ready

Sign smoothly on your iPhone, iPad, Android phone, or touchscreen laptop using your fingertip or Apple Pencil.

Technical Insights & Specifications

Legal Framework of Electronic Signatures (ESIGN Act & eIDAS)

Under the US Electronic Signatures in Global and National Commerce (ESIGN) Act and European Union eIDAS regulation (Regulation (EU) No 910/2014), an electronic signature cannot be denied legal effect or enforceability solely because it is in electronic form. An e-signature is defined as an electronic sound, symbol, or process attached to or logically associated with a contract and adopted by a person with the intent to sign. Embedding a visual signature stamp onto a PDF contract satisfies the intent-to-sign requirement for commercial contracts, vendor agreements, NDAs, lease agreements, and internal corporate authorizations.

Embedding Vector/Raster Signatures Without Compromising Quality

Naive signing tools convert the entire PDF into a low-resolution image to burn in the signature, destroying the crispness of text and making the file look blurry. PDFPK’s modern signing engine embeds your signature as a transparent PNG XObject directly into the document’s page stream. All original vector fonts, crisp lines, and hyperlinks remain 100% untouched.

Technical Specifications Matrix

Input Document	PDF (any version)
Output Document	Signed Standard ISO 32000 PDF
Signature Modes	Draw (Canvas), Type (Cursive Typography), Upload (Image)
Placement Control	X/Y Coordinate Positioning, Width/Height scaling
Engine	Client-Side PDF-Lib + HTML5 Signature Pad
Privacy	100% Local In-Browser Sandboxing (Zero Remote Logging)

Professional Use-Cases

Non-Disclosure Agreements (NDAs)

Sign mutual business confidentiality agreements and vendor contracts in seconds.

Residential & Commercial Leases

Tenants and landlords can sign tenancy agreements, lease extensions, and inventory checklists.

Freelance Contracts & Work Orders

Execute client proposals, statements of work (SOW), and freelance contracts without delays.

HR Onboarding & Permission Forms

Sign employee offer letters, direct deposit authorizations, and school field trip permissions.

100% Privacy Guarantee

Your privacy is our highest priority. Unlike other online document converters, PDFPK processes files locally within your browser sandbox whenever possible. When server-side processing is necessary, files are held ephemerally and automatically purged.

Read our Full Privacy & Data Security Policy

Frequently Asked Questions

Got Questions About Sign PDF?

Everything you need to know about functionality, privacy, and file compatibility.

Are electronic signatures legally binding?

Yes. In the United States (ESIGN Act, UETA) and European Union (eIDAS), electronic signatures carry the same legal weight as traditional pen-and-paper signatures for most commercial contracts, NDAs, and business agreements.

Is my signature stored on your servers?

Never. Your signature is drawn and embedded entirely in your local browser sandbox. It is never uploaded, saved, or transmitted to any server.

Can I sign on my phone or tablet?

Yes! The signature pad is fully touch-enabled, allowing you to draw a smooth, natural signature using your finger or a stylus pen on iPhone, iPad, and Android devices.

Can I choose which page to sign in a multi-page document?

Yes. You can select the specific page where the signature block is located, position your signature stamp, and download the finished file.

Does this tool add any watermarks to my signed document?

No. PDFPK never adds watermarks or branding to your signed files. Your document remains 100% clean and professional.

Is there any fee or document limit?

PDFPK is 100% free with no limits on how many documents you can sign.