KitVela

Free Online PDF Signer (Sign PDF Documents)

Draw or upload your signature and stamp it precisely onto PDF documents.

Sign PDF contracts, agreements, and forms online for free. Draw your signature smoothly with a mouse or touchscreen, or upload a signature image, and stamp it anywhere on any page with precise cursor placement.
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How It Works & Calculation Method

Printing, signing by hand, and scanning paper documents is slow, wasteful, and outdated. Signing contracts, invoices, and job offer letters digitally streamlines modern remote workflows.

Our client-side PDF Signer allows you to draw or upload your personal signature and embeds it directly into your PDF document locally in your browser memory, keeping your signatures and sensitive documents 100% private.

Draw your signature on the interactive canvas with your mouse, stylus, or fingertip, or upload a PNG/JPG signature image.

Click anywhere on the live page preview card to center your signature on that exact position, then download the signed document.

Mathematical Formula

Signature Position: Centered at (TargetClickX - RenderWidth / 2, TargetClickY - RenderHeight / 2)

Worked Example: Signing a Freelance Services Agreement

A designer signs a 2-page consulting agreement on page 2 above the signature line.

•Upload the consulting agreement PDF.
•Draw signature on the signature pad canvas.
•Navigate to page 2.
•Click directly on the client signature line.
•Click 'Stamp Signature & Save PDF'.
•Download signed agreement.
Final Result: Signed document created and ready to email in under 30 seconds.

Common Pitfalls to Avoid

  • •Stamping a signature over existing contract terms instead of the designated signature line.
  • •Uploading signature images with dark backgrounds instead of transparent PNGs.
  • •Using third-party cloud tools that store your handwritten signature in remote databases.

Who This Tool Is For

  • •Freelancers and contractors signing client agreements and work orders.
  • •Job seekers signing formal offer letters and NDA agreements.
  • •Small business owners signing vendor invoices and purchase orders.

How to Use the Sign PDF

1

Upload Document

Select the PDF file you need to sign.

2

Create Signature

Draw your signature or upload an image file.

3

Place & Download

Click the preview to position signature and save.

Frequently Asked Questions

Is this signature legally binding?
In many jurisdictions, electronic signatures are legally recognized under ESIGN and eIDAS frameworks for standard business agreements.
Is my signature saved on your servers?
Never. All drawing, image parsing, and PDF embedding happens entirely in your local browser memory.
Can I sign using a touchscreen or stylus?
Yes, the signature canvas supports full touch events on smartphones, tablets, iPads, and stylus devices.
Can I upload an existing signature image?
Yes, toggle to 'Upload Signature' to import a transparent PNG or JPG image of your signature.
Can I reposition the signature if I clicked the wrong spot?
Yes, click anywhere else on the page preview to instantly re-center the signature to your new cursor position.
Can I inspect the full-size signed page before downloading?
Yes, click the eye icon to verify signature placement in the high-resolution preview modal.

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Last updated: 10/18/2026