Is a PDFWix signature legally valid?

Yes — PDFWix produces a simple electronic signature, which meets U.S. ESIGN Act and eIDAS basic-signature requirements. Sufficient for the vast majority of contracts. Advanced or qualified signatures need a dedicated trust service provider.

Can I sign with Galaxy S Pen or another stylus?

Yes — open pdfwix.com/sign-pdf in Chrome, tap Draw, and sign directly with the S Pen. For maximum pressure sensitivity (S Pen tilt and force), Adobe Acrobat Reader's app supports the full S Pen API.

How to Sign a PDF on Android

A simple step-by-step guide to sign a pdf on Android using PDFWix's free online tools.

How it works

Open PDFWix Sign PDF — Open Chrome on Android and go to pdfwix.com/sign-pdf.
Pick the PDF — Tap Select file and choose the PDF from Files, Downloads, or Drive.
Draw your signature — Tap Draw and sign with your finger or stylus.
Place and resize — Tap on the page to place the signature, drag to position, pinch to resize.
Download — Tap Sign & Download — Chrome saves the signed PDF to Internal storage > Download.

Frequently asked questions

How do I sign a PDF on Android without an app?

Open Chrome and go to pdfwix.com/sign-pdf. Pick the PDF, tap Draw and sign with your finger, place it on the page, and tap Sign & Download. The signed PDF saves to Internal storage > Download. No install, no signup.

Does Android have a built-in PDF signing tool?

No. Stock Android, Samsung One UI, OnePlus, and Xiaomi all ship without a system-wide signing feature. The genuine native options are Adobe Acrobat Reader (free) or PDFWix in Chrome.

Is Adobe Acrobat Reader free for signing on Android?

Yes. Reader's Fill & Sign feature is free. The app aggressively promotes Acrobat Pro ($9.99/month as of May 2026) — you don't need Pro just to sign.