Sign PDF Documents Online

Add your signature to any PDF. Draw with your mouse or finger, type in cursive, or upload a signature image. Free, fast, browser-based.

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Maximum file size: 10MB

Signing a PDF electronically saves the entire print-sign-scan-email loop that used to consume an hour every time someone sent you a contract. With an e-signature you open the PDF, place your signature where indicated, and email the signed file back — total time, under two minutes. Dokfo's free PDF signing tool offers three ways to create your signature: draw it freehand with your mouse or finger (works great on touchscreens and tablets), type your name in a cursive font (the fastest option for low-formality documents), or upload an image of your existing handwritten signature (best fidelity if you've previously scanned a real signature). Then click on the PDF where you want it placed, resize and reposition as needed, and apply. The signed PDF downloads with the signature baked in as part of the page content. Recipients see the signature in any PDF reader, and the file looks indistinguishable from a printed-and-signed-and-scanned document. Electronic signatures are legally recognized in most countries (ESIGN Act in the US, eIDAS in the EU) for the vast majority of business and personal documents.

How to Sign a PDF — Step by Step

1

Upload your PDF by clicking the upload area or dragging the file. Dokfo loads it locally and renders an interactive preview.

2

Create your signature: draw it with your mouse or finger, type your name in a cursive font, or upload a signature image. Pick whichever feels right.

3

Click on the PDF where you want the signature placed. Drag to reposition, resize as needed, then click apply. The signed PDF downloads automatically.

Why Sign PDFs With Dokfo?

Three Signature Methods

Draw your signature with mouse or finger (perfect for touchscreens), type your name in a cursive font, or upload a scanned signature image. Pick whichever matches your style.

Click-to-Place

Drop your signature exactly where it needs to go by clicking on the PDF preview. Resize and reposition before applying — easy to get the placement right.

Browser-Based Privacy

Signing happens locally with pdf-lib. Your contract, agreement, or signed document never leaves your device — critical for personal and business documents.

Legally Recognized

Electronic signatures are legally recognized in most countries under laws like ESIGN (US) and eIDAS (EU). Dokfo's signed PDFs are valid for the vast majority of routine business documents.

When to Sign a PDF

Sign and return contracts, NDAs, employment agreements, and freelance project agreements without printing.
Add your signature to acknowledgement forms, school permission slips, and HR onboarding documents.
Initial individual pages of legal documents (in addition to a final signature).
Approve invoices, expense reports, or purchase orders by signing with your business signature.
Sign tenant agreements, lease documents, real-estate offers, and other home-related paperwork.

Signed Documents Stay on Your Device

Dokfo's signature tool runs 100% client-side using pdf-lib. Your PDF and your signature (drawn, typed, or uploaded) are processed in browser memory, the signature is added to the page, and the signed PDF is saved back to disk — without any server round-trip. This is essential when signing confidential contracts, personal financial documents, or legally sensitive material. Verify in Developer Tools → Network tab: zero data transmission.

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Frequently Asked Questions About Signing PDFs

How do I sign a PDF online?

Upload your PDF, create your signature (draw with mouse/finger, type in cursive, or upload an image), then click on the PDF to place it. Drag to reposition, resize, and click apply. The signed file downloads automatically.

Is an electronic signature legally valid?

Yes, in most countries. The US ESIGN Act, EU eIDAS regulation, UK Electronic Communications Act, and similar laws worldwide recognize electronic signatures as legally binding for the vast majority of documents. Some specific document types (wills, certain real estate, court filings) may require notarization or specialized e-signature platforms — check local law for high-stakes situations.

Can I draw my signature with my finger on mobile?

Yes. Dokfo works on touchscreens — draw your signature with your finger or stylus on phones and tablets. The result is just as good as drawing with a mouse on a desktop.

Can I upload a scanned signature?

Yes. Scan or photograph your handwritten signature, save as a PNG (with transparent background) or JPG, and upload it. Dokfo will use it as your signature image.

Is my signature stored anywhere?

No. Your signature is held only in your browser's memory during the signing session. Once you close the tab, it's gone. There is no server-side storage of your signature.

Can I sign multiple pages?

Yes. Use the page navigation to switch pages and place signatures or initials on each page that requires them.

Are my files uploaded?

No. Signing happens entirely in your browser using pdf-lib. Your PDF and signature never leave your device. Inspect the Network tab to verify.

Will the signed PDF have a watermark?

Never. Dokfo never adds watermarks — only the signature you place. The signed PDF looks exactly like a normal signed document.