Sign PDF

Sign a PDF without uploading it.

Draw your signature, type it, or upload an image, then place it anywhere on the document. The draw pad uses a pressure-style ink pen and goes full-screen on phones. KeptPDF signs in your browser so neither your signature nor your document is ever transmitted.

Sign a PDF free How it works

Every document you sign tells you something about the signer.

A contract, an NDA, a medical form: anything that needs your signature is sensitive by definition. Uploading it to a third-party service to sign is giving a stranger your document and your signature at the same time. KeptPDF signs in your browser. Neither the document nor the signature image ever leaves your device.

The difference in one sentence

A document you're signing is sensitive, which is exactly why you shouldn't upload it to a service you don't control to add your signature.

KeptPDF places your signature on the PDF's canvas entirely in your browser, then bakes it into the file locally. There's no server-side render step. You can check the Network tab yourself while signing. Your document never appears in a single request.

How to sign a PDF

Three steps, on your device. No account needed, and nothing gets uploaded.

1. Open your PDF

Drop the document onto the page. It loads in your browser. Nothing is sent anywhere.

2. Create and place your signature

Draw it with your mouse or finger, type it, or upload a signature image. Drag to position it, resize as needed.

3. Download the signed PDF

Your signature is baked into the page as a permanent element. The signed copy is ready to send.

Your signature. Your document. No one else involved.

Three signature modes

Draw freehand with your mouse or touchscreen, type your name in a signature font, or upload a PNG of your handwritten signature.

No upload

Neither the document nor the signature is sent to any server. The entire signing process happens in your browser.

Free, no account

Sign PDFs free with no sign-up, no daily limit. Pro ($29/month) supports larger files (hundreds of MB practical limit, browser memory dependent).

Signed audit certificate (Pro)

Pro users get a signed PDF + JSON certificate recording the document hash and timestamp, for records that need to prove the document wasn't altered after signing.

Questions, answered.

How do I add my signature to a PDF for free?

Open KeptPDF's Sign tool, drop in your PDF, draw or type your signature, drag it to the signature line, and download. Free, no account required.

Is an e-signature on KeptPDF legally binding?

KeptPDF produces a Simple Electronic Signature (SES), the level used for the vast majority of everyday agreements. Whether it's legally sufficient depends on your jurisdiction and the specific document. For agreements that require a higher assurance level (qualified signatures in the EU, notarization, etc.), consult a lawyer.

Is my signature stored anywhere?

No. Your signature image is created in your browser and used to modify the PDF locally. It's never sent to a server, stored in a database, or retained after you close the tab.

Can I sign on my phone?

Yes. KeptPDF works in mobile browsers. You can draw your signature directly with your finger on the touchscreen.

Can I sign a form that has fillable fields?

Yes. Use the Fill a Form tool instead. It auto-detects form fields, lets you fill them, then add your signature, all in one step.

Is it free?

Yes. Free, no account required. Pro ($29/month) supports larger files (hundreds of MB practical limit, browser memory dependent), and adds a signed audit certificate.

Sign a PDF. Free, in your browser.

Open Sign PDF