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FAQ

Sign PDF Online Free - Add Electronic Signature to PDF

Add your signature to PDF documents online for free. Use local processing to sign directly in your browser (no upload), or switch to server processing for large files. Draw your signature, upload a signature image, or type your name to create a professional electronic signature. Our secure tool lets you sign contracts, agreements, forms, and any PDF document without printing.

Process locally (no upload)
Files stay in your browser. Best for total size under ~100 MB.
Drag & drop your PDF here or click "Choose PDF File".

How it works

  1. Choose processing mode: Keep local processing on for privacy, or switch to server mode for very large files.
  2. Upload your PDF: Drag & drop or click to add the document to sign.
  3. Create/import signature: Draw, type, or upload an image of your signature.
  4. Place and size: Click where you want the signature and adjust its size/rotation.
  5. Download signed PDF: Save the signed document instantly.

Processing details, limits, and tips

Security and privacy

Your PDF and signature can be processed locally in your browser with no upload. If you switch to server mode, files are used only to create the signed document and are deleted immediately after download. We do not store, scan, or share your documents. Refresh the page after downloading if you want to clear any temporary references.

What is PDF Electronic Signing?

PDF electronic signing (e-signing) allows you to add your signature to digital documents without the need to print, sign by hand, and scan. Electronic signatures are legally recognized in most countries around the world, making them a convenient and efficient way to sign contracts, agreements, forms, and other important documents.

Our free PDF signing tool provides multiple ways to create your signature: you can draw your signature using your mouse, touchpad, or touchscreen; upload an image of your handwritten signature; or simply type your name with a stylized font. The signature is then placed directly onto your PDF document, creating a professionally signed document ready for sharing or submission.

Electronic signatures save time and resources by eliminating the need for printing, physical signing, scanning, and mailing documents. They're perfect for remote work, international business transactions, and anyone who needs to sign documents quickly and efficiently from anywhere in the world.

How to Sign PDF Documents Online

1

Upload Your PDF

Click the "Choose PDF File" button or drag and drop your document into the upload area. Your PDF will be loaded into our secure signing interface where you can view all pages.

2

Create Your Signature

Click "Draw Signature" to open the signature pad and draw your signature using your mouse, stylus, or finger on a touchscreen. Alternatively, click "Add Signature Image" to upload an existing image of your signature.

3

Place Your Signature

Your signature will appear on the PDF. Click and drag to position it exactly where you need it. You can resize the signature by dragging the corners, and navigate between pages to add signatures on multiple pages if needed.

4

Save and Download

Once you're satisfied with the signature placement, click "Save PDF" to embed the signatures into your document. Then click "Download" to get your signed PDF file.

Why Use PDF Lab's PDF Signing Tool?

Draw Natural Signatures

Our smooth drawing tool captures your natural signature style. Use your mouse, touchpad, stylus, or finger to create an authentic-looking signature.

Multiple Signature Methods

Draw your signature, upload an image of your existing signature, or add signature images from your device. Choose the method that works best for you.

Multi-Page Support

Navigate through all pages of your PDF and add signatures wherever needed. Perfect for contracts that require signatures on multiple pages.

Precise Positioning

Drag, resize, and rotate your signature for perfect placement. Our tool gives you complete control over exactly where your signature appears.

Secure Processing

Your documents are processed securely and automatically deleted after download. We never store or share your sensitive files.

Works Everywhere

Sign PDFs on any device - desktop, laptop, tablet, or smartphone. No software installation required - just use your web browser.

Common Use Cases for PDF Signing

Signing business contracts
Employment agreements
Rental and lease agreements
Non-disclosure agreements (NDAs)
Permission and consent forms
Tax documents and forms
School and university forms
Medical consent forms

Tips for Creating Professional Signatures

Use a Stylus or Touchscreen

For the most natural-looking signature, use a stylus on a tablet or draw directly on a touchscreen device. This gives you the best control over your signature strokes.

Practice Makes Perfect

Don't worry if your first attempt isn't perfect. Use the "Clear" button to start over and practice until you're happy with how your signature looks.

Use Transparent Background

When uploading a signature image, use a PNG file with a transparent background for the cleanest look on your documents.

Size Appropriately

Resize your signature to fit the signature line on your document. A signature that's too large or too small can look unprofessional.

Frequently Asked Questions

Are electronic signatures legally binding?

Yes, electronic signatures are legally recognized in most countries including the US (ESIGN Act), EU (eIDAS), UK, Canada, Australia, and many others. They carry the same legal weight as handwritten signatures for most documents.

Is my signed document secure?

Yes. With local processing, your PDF never leaves your device. With server processing, files are transmitted securely using HTTPS and deleted after you download the signed version.

When should I use local processing vs server processing?

Use local processing for privacy-first workflows and files under ~100 MB. Use server processing for very large PDFs or slower devices. Both modes are free and secure.

Can I sign multiple pages?

Absolutely! Use the page navigation buttons to move between pages and add signatures wherever needed. Your signatures on each page are saved automatically.

What's the difference between electronic and digital signatures?

Electronic signatures (e-signatures) are any electronic mark representing agreement, like the drawn signatures our tool creates. Digital signatures use cryptographic certificates for additional verification. Both are legally valid, but digital signatures offer enhanced security for high-stakes documents.

Can I remove or edit a signature after saving?

Once you save and download the signed PDF, the signatures are embedded in the document. To make changes, you'll need to start again with the original unsigned PDF.

What file formats are supported?

Our tool works with PDF files. For signature images, you can upload PNG, JPG, or JPEG images. PNG with transparent background is recommended for the best results.

Sign Your PDF Documents Now

Add your signature to any PDF document in seconds - completely free and secure.

Start Signing PDFs

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