Signing a PDF on your phone used to mean downloading an app, creating an account, and fighting with a clunky mobile interface. Modern browsers have changed that — you can sign directly from Safari or Chrome without installing anything.
Sign a PDF on iPhone or Android — step by step
- Open your browser (Safari on iPhone, Chrome or Firefox on Android)
- Go to quickpdfsign.com
- Tap "Choose File" — on iPhone, you can pick from Files, iCloud Drive, Google Drive, or your photo library. On Android, it opens your Downloads or Files app.
- Select a signature method:
- Draw with your finger in the signature pad
- Type your name for a clean handwriting font
- Upload a photo of your written signature
- Tap where you want the signature on the PDF page
- Tap Download — the signed PDF saves to your device
Where does the file go after downloading?
iPhone: The PDF downloads to your Downloads folder inside the Files app. You can then share it via Mail, WhatsApp, AirDrop, or upload it to iCloud Drive.
Android: The PDF saves to your Downloads folder. Access it through the Files app or any file manager. Share via Gmail, WhatsApp, or upload to Drive.
What about using the Notes app or Markup on iPhone?
iPhone's Markup tool (available when sharing a PDF via the share sheet) lets you draw on top of a PDF. However, the signature is saved as a drawing layer, not embedded into the PDF itself. Some PDF readers display it correctly, others don't. For a reliable, portable signed PDF, use a dedicated signing tool.
What about app-based PDF signers?
Apps like Adobe Fill & Sign, DocuSign, and SignNow all work on mobile, but they require downloads, account creation, and — for full features — a subscription. For signing a single document, that's a lot of setup.
The browser approach requires nothing: no install, no account, no payment.
Does mobile signing produce a legally valid PDF?
Yes. Whether you sign on desktop or mobile, the resulting PDF is legally equivalent. Electronic signature laws (E-SIGN Act, eIDAS) don't care what device you used — they care that you intended to sign the document.