Is this a legal digital signature?

This tool adds a visible signature image to the page (like signing on paper). It is not a cryptographic digital certificate.

No. Signing runs entirely on your device.

What does flatten mean?

It removes fillable form fields after your signatures are burned in, similar to flattening in desktop PDF tools.

Yes. All processing is client-side.

Use SagePDF to sign pdf android. Add digital signatures to PDFs. Use SagePDF in your browser—no uploads, no signup, your files stay on your device.

Drop your PDFs here, or click to choose files

Your files never leave your device. All processing happens in your browser.

Choose your PDF. Everything stays in your browser.

Draw on the pad, type your name, or upload a signature image—then click “Place signatures” and tap where each signature should go.

Optional: check “Flatten PDF” to remove form fields. Click “Save & download signed PDF”, then download your file.