Sign PDF Online for Free

PDF signing lets you place a handwritten-style signature on any page of your document without printing, signing on paper, and scanning back. You draw your signature on a canvas using a mouse, trackpad, or finger on a touchscreen. The tool captures your drawing as a high-quality image and embeds it on the page you select, positioned near the bottom where signatures typically appear.

The signing process is entirely client-side. Your browser renders a drawing canvas using the HTML5 Canvas API. When you draw, the stroke data stays in local memory. The tool converts your signature to a PNG image, then uses pdf-lib to embed it on the chosen page of your PDF. The result downloads from your browser’s memory. Your signature data is never transmitted, stored, or logged anywhere.

Documents that people commonly sign with this tool:

• Freelance contracts and consulting agreements
• Rental applications, lease agreements, and move-in checklists
• School permission slips, field trip forms, and medical release forms
• Internal company approvals, purchase orders, and expense claims
• Acknowledgment forms for policies, NDAs, and onboarding documents

Dedicated e-signature platforms (DocuSign, HelloSign, Adobe Sign) cost $10-25 per month and require uploading your document to their servers. They are built for multi-party signing workflows with audit trails. If you just need to sign a document yourself and send it back, that is overkill. Our tool does the single-signer job in 10 seconds, for free, with zero data leaving your device.

After signing, protect the PDF with a password to prevent someone from editing the signed document. For added security, apply a ’Signed’ watermark so the document’s status is visible on every page. If the document needs page numbers before signing, use Add Page Numbers first.