Guide
How to Add a Signature to a PDF Online Free
Updated 2026-09-03 · OyoPdf guides
Add your handwritten or typed signature to a PDF free online. Browser-based e-signature with OyoPdf — no account required.
Three ways to add a signature
- Draw — use your mouse or touchscreen to handwrite your name
- Type — pick a signature font and type your name
- Upload — photograph your ink signature and upload as an image
Privacy when signing
Because OyoPdf Sign PDF operates in the browser, your document and signature are never sent to a remote server for standard signing. This is important for NDA, tax, and medical paperwork.
Quick steps
- Open OyoPdf Sign PDF.
- Upload the PDF you need to sign.
- Click 'Add Signature' and draw, type, or upload an image of your signature.
- Drag the signature to the correct position on the page.
- Download the signed PDF — no account required.
Frequently asked questions
- Is a drawn PDF signature legally valid?
- E-signatures are legally valid in most countries under laws like the US ESIGN Act and EU eIDAS. For high-stakes contracts, use a certified e-signature provider.
- Can I add my signature to a PDF on my phone?
- Yes. OyoPdf Sign PDF works in mobile browsers. Draw your signature with your finger on the touchscreen.
- Does my signature get stored on your servers?
- No. OyoPdf Sign PDF processes in your browser. Your signature drawing and document stay on your device.
- What's the difference between Sign PDF and a digital certificate?
- Sign PDF places a visual signature image on the document. A digital certificate adds cryptographic proof of identity — needed for legally binding government or finance submissions.