If a contract, form or agreement just landed in your inbox, you don't need a computer or a desktop tool. With PDF42 you open the file, drop in your signature, and send it back — entirely on your Android phone.
Sign a PDF in 4 steps
- Open the PDFTap the file to open it in PDF42. It loads instantly — no splash screen, no ad before your document.
- Tap the Sign toolIn the bottom toolbar, tap Sign.
- Draw or reuse your signatureDraw it once with your finger, or pick a signature you've already saved.
- Place it and saveDrag the signature where it belongs, resize if needed, then save or share the signed PDF.
That's it. Your saved signature is reusable, so the next document takes seconds.
Do I need to print and scan?
No. Printing, signing on paper and scanning back is slow and lowers quality. Signing digitally in PDF42 keeps the document sharp and is accepted for most everyday forms and agreements.
Is it really free?
Yes — reading and signing are free. PDF42 only asks you to refill a daily save quota with a quick rewarded action, or go Pro to remove that entirely. You're never paywalled before you read or sign.