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Sign PDF Documents Online - Add Legally Binding Electronic Signatures Sign PDF Online – Add Your Signature

Add legally valid electronic signatures to PDF documents without printing or scanning. Draw your signature, type it, or upload an image. Perfect for contracts, agreements, forms, and business documents requiring signatures. Add your electronic signature to PDF files instantly. Draw, type, or upload a signature and sign documents online for free.

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Sign PDF Documents Online Securely

Sign PDF documents online quickly and securely using DonePDF. Add your electronic signature to contracts, forms, and official documents directly in your browser without installing any software.

How to Sign a PDF Online

Signing a PDF online with DonePDF is simple. Upload your document, create your electronic signature by drawing, typing, or uploading an image, then place the signature anywhere in the document before downloading the signed PDF.

Multiple Ways to Create Your Signature

DonePDF allows you to create a digital signature in multiple ways. You can draw your signature using a mouse or touch screen, type your name with signature-style fonts, or upload an image of your handwritten signature.

Common Documents You Can Sign

Electronic signatures are commonly used for contracts, agreements, legal documents, and official forms. DonePDF helps you sign documents quickly without printing or scanning.

Secure PDF Signing

Your documents remain secure when signing PDFs with DonePDF. The signing process runs directly in your browser, ensuring that your files are not permanently stored on external servers.

Sign PDFs on Any Device

DonePDF works on all devices and operating systems. Whether you are using Windows, macOS, Linux, Android, or iOS, you can sign PDF documents directly in your browser.

Why Sign PDFs Online?

Online PDF signing eliminates the need to print, sign, scan, and resend documents. Electronic signatures allow faster approvals, easier document management, and more efficient digital workflows.

Sign PDF Electronically – Complete Use Cases & Advanced Features

The Sign PDF tool allows you to securely add legally recognized electronic signatures to any document. Whether you need to sign contracts, invoices, NDAs, forms, or agreements, this tool provides a complete visual signature solution. You can draw your signature using mouse or touch, type your name with professional fonts, or upload an image of your handwritten signature. Add signature dates, specify signer identity, and even password-protect the signed document. All operations are performed online without printing, scanning, or installing software — saving time, paper, and ensuring document integrity.

Draw Your Signature Manually – Natural Handwriting Experience

Use your mouse, trackpad, or touchscreen to draw your signature naturally. The tool captures every stroke precisely, preserving the unique characteristics of your handwritten signature. You can adjust stroke thickness, color (black, blue, or red), and background transparency. After drawing, you can reposition the signature anywhere on the page and resize it without losing quality. This method is ideal for tablets, touchscreen laptops, or anyone who prefers a handwritten look without printing.

Type Your Signature – Clean, Professional, and Fast

If you need a clear, legible signature, choose the type option. Select from over 20 cursive and handwriting-inspired fonts (e.g., Segoe Script, Brush Script, Great Vibes). Customize font size, color, and style (bold/italic). Typed signatures are perfect for formal business documents, reports, and digital forms where readability matters more than a drawn signature. You can also combine typed name with a drawn initial for hybrid authentication.

Upload Signature Image – Use Your Real Handwritten Signature

Upload a scanned image or photo of your actual handwritten signature (PNG, JPG, or transparent background). The tool automatically removes white backgrounds, preserves transparency, and optimizes resolution. You can crop, resize, and rotate the uploaded signature. This method offers maximum authenticity because you use your real, legally binding signature exactly as it appears on paper documents. Ideal for notaries, executives, and legal professionals.

Add Signature Date Automatically or Manually

Every signed document should include a date. You can insert today’s date automatically (based on your system timezone) or enter a custom date. The date can be positioned near the signature or anywhere on the page. Choose date formats (MM/DD/YYYY, DD/MM/YYYY, or YYYY-MM-DD). Including the date creates a verifiable timeline and is often required for legal enforceability under e-signature laws (ESIGN, eIDAS).

Add Text Fields – Names, Titles, and Additional Information

Beyond the signature itself, you may need to add the signer’s printed name, job title, company name, or “Signed by” label. The tool provides text boxes that you can place anywhere on the document. Customize font, size, color, and alignment. This feature transforms a simple signature tool into a complete document completion tool, allowing you to fill in missing information before signing.

Multiple Signatures on the Same Document

Some documents require multiple signatures – for example, contracts with two parties, approval workflows with manager and director, or multi-page agreements. You can add as many signature fields as needed, each with different styles (drawn, typed, or uploaded). You can also sign the same document at different locations (e.g., signature on page 1, initials on page 3, and date on final page). All signatures are independent and can be added sequentially.

Resize, Reposition, and Rotate Signatures Freely

After adding a signature, you can drag it to any location on the page, resize it by dragging corners, and rotate it in 15-degree increments. The visual editor shows real-time preview, so you always know exactly how the final PDF will look. This flexibility ensures your signature fits perfectly into designated signature boxes, regardless of the original PDF layout.

Password-Protect the Signed PDF

For sensitive documents, you can add a password after signing. The tool encrypts the PDF with AES-256, requiring the recipient to enter the password to open, view, or print the file. You can also set permissions (e.g., allow printing but disable editing). This is crucial for contracts containing personal data, financial information, or trade secrets. The original unsigned document remains unprotected – only the signed output is secured.

Add Initials for Multi-Page Documents

Long contracts often require initials on every page to confirm review. The tool includes a dedicated “Initials” mode with smaller signature fields. You can create a simplified initial signature (e.g., two letters) and then click “Apply to All Pages” to place it on every page automatically. You can also manually add initials to specific pages. This saves enormous time when signing 20+ page agreements.

Save and Reuse Signatures – No Redrawing Needed

If you frequently sign documents, you can save your signature (drawn, typed, or uploaded) to your browser's local storage. The next time you use the tool, your saved signature appears instantly. You can manage multiple saved signatures (e.g., personal signature, company signature, proxy signature). This feature dramatically speeds up repeated signing tasks like daily invoices, approval forms, or batch document processing.

Transparent Background for Signatures – Professional Overlay

All signatures are added with transparent backgrounds by default, meaning they overlay seamlessly onto the PDF without covering existing text or lines. You can adjust opacity (10% to 100%) to create a watermark-like effect or a solid signature. Transparency ensures that your signature integrates naturally, just like ink on paper.

Undo, Redo, and Clear Signature Controls

Made a mistake? Use undo/redo buttons to step back through signature placements, text additions, or date changes. You can also clear all signatures from the current page or the entire document with one click. These controls give you full confidence to experiment without fear of ruining the document.

Download Signed PDF Immediately – No Server Storage

After adding all signatures, dates, and text fields, click “Sign PDF” to generate the final document. The signed PDF is downloaded directly to your device. The tool does not store your documents, signatures, or any data on its servers. All processing happens locally in your browser for maximum privacy and security. Your original unsigned file and your signature image are never uploaded to any cloud.

Works with Scanned Documents and Photos

Even if your PDF is a scan of a physical document or a photo converted to PDF, the signature tool works perfectly. You can add digital signatures on top of scanned paper forms, eliminating the need to print, sign by hand, and scan again. This is a massive time saver for remote work, real estate documents, medical forms, and legal paperwork.

Legal Compliance – ESIGN Act, eIDAS, and UETA

The signatures created with this tool are legally binding in most countries. Electronic signatures that include intent (e.g., clicking “Sign”), consent, and attribution (timestamp + signature image) satisfy the US ESIGN Act, EU eIDAS regulation, and UETA. For higher assurance, you can combine the signed PDF with an audit trail (download the signed PDF plus a separate timestamp log). The tool does not provide digital certificates (PKI) but is suitable for 95% of business and personal signing needs.

After signing your PDF, you may want to protect it with a password, reduce file size, or combine multiple signed documents.

Related PDF Tools for Document Completion

These complementary tools help you finalize, secure, and share your signed PDFs efficiently.

Frequently Asked Questions about Electronic Signatures

What does it mean to sign a PDF electronically?

Electronic signing means adding a visual representation of your signature (drawn, typed, or uploaded) to a PDF document without printing. It indicates approval, consent, or authentication and is legally binding in most jurisdictions.

Can I draw my signature with a mouse?

Yes, you can draw your signature using your mouse, trackpad, or touchscreen. The tool captures your strokes naturally, and you can adjust thickness and color.

Can I type my signature instead of drawing?

Absolutely. Choose from over 20 cursive fonts, select size and color, and type your name. Typed signatures are clean, professional, and fast.

Can I upload a photo of my handwritten signature?

Yes. Upload a PNG, JPG, or image of your signature. The tool removes backgrounds automatically and lets you resize and position it perfectly.

Can I add multiple signatures to one PDF?

Yes. You can add signatures from different people or add your own signature in multiple locations (e.g., signature on page 1, initials on page 5).

Can I add the date along with my signature?

Yes. You can insert today's date automatically or enter a custom date. Choose from multiple date formats and position it anywhere.

Is my signature saved for future use?

Yes. You can save your signature (drawn, typed, or uploaded) in your browser. It will be available the next time you use the tool, saving you time.

Can I password-protect the signed PDF?

Yes. After adding signatures, you can set a password to encrypt the PDF. Only recipients with the password can open the signed document.

Does the tool work with scanned documents?

Yes. You can sign scanned PDFs, photos converted to PDF, or any existing PDF. The signature overlays on top, eliminating printing and rescanning.

Are electronic signatures legally binding?

Yes. Signatures created with this tool satisfy ESIGN Act, eIDAS, and UETA requirements for most business and personal contracts. For high-risk documents, consider additional audit trails.

Can I add initials instead of a full signature?

Yes. Use the "Initials" mode to create a shorter signature. You can also apply initials to all pages of a multi-page document with one click.

Can I reposition or resize my signature after adding it?

Yes. You can drag signatures to any location, resize them by dragging corners, and rotate them in 15-degree increments.

Is my document uploaded to your server?

No. All processing happens locally in your browser. Your PDF and signature never leave your device. The signed PDF is downloaded directly to your computer.

Can I sign a PDF on my phone or tablet?

Yes. The tool is fully responsive and works on smartphones and tablets. Use your finger or a stylus to draw your signature naturally.

What file formats can I sign?

The tool accepts PDF files. If you have a Word document or image, convert it to PDF first using our "Convert to PDF" tool, then sign it.

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