Add Signature to PDF Online

Add an electronic signature to your PDF online. With LightPDF’s PDF signature tool, you can sign PDF documents, invite others to sign, and download completed files.

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How to Sign a PDF Online

Use LightPDF to add a signature to PDF files online in just a few steps

Upload your PDF

Drag and drop your PDF into the upload area, or click “Choose File” to select a document from your device.

Add Signature or Invite Signers

Add your own electronic signature to the PDF, or invite others to sign the document. You can also set the signing order and choose where the signature should appear.

Manage and Download

Track pending documents online and download the completed signed PDF after signing.

What You Can Do with LightPDF PDF Signature Tool

LightPDF helps you complete the online PDF signing process, from adding signatures and sending signature requests to managing documents and downloading signed PDFs.

Sign PDFs Yourself

Add your own electronic signature to a PDF document directly online. You can place the signature where it needs to appear and complete simple signing tasks.

Send Documents for Signature

Send a request to another person who needs to sign it. This is useful when a document requires approval, confirmation, or signature from clients, partners, team members, or other recipients.

Manage Signing Order and Progress

Set the signing order for multiple signers and track whether each document is still pending or completed. This helps keep the eSign PDF process clear and organized.

Store and Download Signed Documents

Keep documents waiting for signature in the cloud, then download the completed signed PDF after all required signatures are collected.

eSign PDFs for Everyday Needs

LightPDF makes it easy to sign PDF documents online for work, study, business, and personal use.

Contracts and Agreements

Quickly add your electronic signature to simple contracts, agreements, authorization forms, or confirmation documents without printing them out.

Application Forms

Fill out and sign application forms, school documents, registration files, or HR forms directly online.

Business Documents

Sign invoices, quotations, approval documents, and other business PDFs to speed up daily document workflows.

Personal Files

Add your signature to letters, consent forms, travel documents, and other personal PDFs whenever you need a quick signing solution.

Best Online PDF Signature Tools Compared

Compare LightPDF, Smallpdf, and iLovePDF to choose an easy online tool for signing PDFs online.

Feature	LightPDF	SmallPDF	iLovepdf
Free PDF Signing	Supported	Available with limited access	Available with limited
Signing Documents Yourself	Supported	Supported	Supported
Signature Request	Supported	Supported	Supported
Add Signature Position	Place the signature where needed	Place signature, initials, text, date, or checkboxes	Drag and place signature fields on the document
Certified Digital Signature	Not supported	Available on paid plan	Supported in premium
Daily / Plan Limits	Limits depend on free or paid plan	Limited to 2 documents/month	Basic plan supports 3 Sign PDF tasks; Premium/Business supports 5 Sign PDF tasks
Ease of Use	Very simple	Easy	Easy, advanced features require Premium
Cross-Device Access	Browser-based access on desktop and mobile	Works online on Mac, Windows, Linux, iOS, and Android	Web access available; desktop and mobile access require Premium

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Do I need to print or scan the document?

No. You can sign your PDF directly online without printing, manually signing, or scanning the document again.

Is this a certified digital signature?

No. LightPDF’s online Sign PDF tool is designed for adding an electronic signature to a PDF. It is not a certified electronic signature service and does not provide certificate-based digital signatures, identity verification, audit trails, or legal signing certificates.

Can I draw my signature on a PDF?

Yes. You can draw your signature online and add it to your PDF document.

Can I upload an image signature?

Yes. You can upload an image of your signature and place it on the PDF.

Can I use LightPDF on mobile?

Yes. LightPDF works in the browser, so you can sign PDFs from desktop or mobile devices.