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PDF Signature

Digital Signing

Pages
Sign Your PDF
Drop file here or click to browse
Max 50MB Secure & Private
Digital Signature
Name (optional) ▾
Saved Signatures
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Company Stamps
Saved Stamps
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How to sign a PDF

1

Upload your PDF

Select or drop the PDF document you want to sign.

2

Create your signature

Draw, type or upload an image of your signature. Add text, dates or stamps as needed.

3

Place & download

Drag the signature to the exact spot on the document and download the signed PDF.

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Sign PDF Online Free - Add Your Digital Signature

Sign PDF documents digitally and securely. Draw, type, or upload your signature. Add stamps, dates, and text. Save your signatures for future use. No registration required.

PDF Signature Features

✍️

Multiple Signing Methods

Draw your signature with mouse or touchscreen, type it with elegant fonts, or upload an image.

🔖

Custom Stamps

Add 'Approved', 'Confidential', 'Signed' stamps or upload your own corporate stamps.

💾

Save Signatures

Sign in to save your favorite signatures and stamps for quick use on future documents.

📝

Complete Annotations

Add text, dates, and notes in addition to your signature to complete any document.

When to Use PDF Signature?

  • Sign contracts and legal agreements quickly
  • Authorize corporate documents with official stamps
  • Complete forms that require signatures
  • Add dates and approvals to review documents
  • Sign multiple documents consecutively with saved signatures

Frequently Asked Questions

Is this signature legally valid?

Electronic signatures are legally valid in most countries for commercial documents. For documents with specific legal requirements, consult local regulations.

Can I save my signature for later use?

Yes. If you sign in, you can save signatures and stamps to access them quickly on future documents.

What image formats are accepted for stamps?

We accept PNG, JPG, and GIF. We recommend PNG with transparent background for best results.

Can white backgrounds be removed from signatures?

Yes. Our tool can automatically remove white backgrounds from signatures and stamp images.

Sign PDF Online Free - Add Your Digital Signature

Sign PDF documents digitally and securely. Draw, type, or upload your signature. Add stamps, dates, and text. Save your signatures for future use. No registration required.

PDF Signature Features

Multiple Signing Methods

Draw your signature with mouse or touchscreen, type it with elegant fonts, or upload an image.

Custom Stamps

Add 'Approved', 'Confidential', 'Signed' stamps or upload your own corporate stamps.

Save Signatures

Sign in to save your favorite signatures and stamps for quick use on future documents.

Complete Annotations

Add text, dates, and notes in addition to your signature to complete any document.

Multiple Font Styles

Choose from casual, elegant, classic, and handwritten font styles when typing your signature for the perfect professional look.

Touchscreen Optimized

Draw signatures naturally on tablets and phones. The canvas captures pressure-sensitive strokes for realistic results.

When to Use PDF Signature?

How Does PDF Signing Work?

Our PDF signature tool provides three methods to add your signature to any document. Draw your signature using your mouse, trackpad, or touchscreen for a natural handwritten look. Type your name and choose from a collection of elegant handwriting fonts that transform it into a professional signature. Or upload an existing signature image, and the tool can automatically remove white backgrounds for a clean result. Once your signature is created, place it anywhere on any page of your document with precise positioning. You can also add complementary elements such as dates, text annotations, and official stamps like Approved, Confidential, or Reviewed. If you sign in, your signatures and stamps are saved for instant reuse on future documents. The signed PDF is generated with all elements permanently embedded, producing a professional result ready for business use.

Signing documents online is safe with PDF Ninja. Your files are processed securely and never stored beyond the active session. Saved signatures are encrypted and linked to your account only. We use HTTPS encryption for all file transfers and comply with international data protection standards including GDPR.

Pro Tip: Save Your Signature for Speed

If you sign documents frequently, create an account and save your signature. Next time you need to sign a PDF, your saved signature loads instantly, and you can place it with a single click instead of drawing or uploading again.

Frequently Asked Questions

Is this signature legally valid?

Electronic signatures are legally valid in most countries for commercial documents. For documents with specific legal requirements, consult local regulations.

Can I save my signature for later use?

Yes. If you sign in, you can save signatures and stamps to access them quickly on future documents.

What image formats are accepted for stamps?

We accept PNG, JPG, and GIF. We recommend PNG with transparent background for best results.

Can white backgrounds be removed from signatures?

Yes. Our tool can automatically remove white backgrounds from signatures and stamp images.

Can I sign a PDF on my phone or tablet?

Yes. The signature tool is fully optimized for mobile devices. You can draw your signature with your finger on the touchscreen, or type and upload one just like on desktop.

Is an electronic signature on a PDF legally binding?

In most jurisdictions, electronic signatures are legally valid for commercial and business documents under laws like the ESIGN Act (US) and eIDAS (EU). For highly regulated documents, check your local requirements.

Can I add multiple signatures to the same PDF?

Yes. You can add as many signatures as needed on any page. This is useful for documents that require signatures from multiple parties or initials on every page.

How do I remove the white background from a signature image?

When you upload a signature image, the tool offers an automatic background removal option. Toggle it on to make white areas transparent, so the signature blends naturally with the document.

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