You don't need a computer to sign PDF documents. Modern smartphones — both iPhone and Android — can sign any PDF directly in the browser using touch gestures. Whether you're away from your desk, on a business trip, or just prefer using your phone, here's how to sign documents on the go.
Signing on iPhone (Safari)
- Open the PDF: If the document was emailed to you, tap the attachment in the Mail app to download it. If it's stored in Files or iCloud, open it from there.
- Open the signing tool in Safari: Navigate to a free browser-based PDF signing tool. No app download required.
- Upload the PDF: Tap the upload area and select the PDF from your Files app.
- Draw your signature: Use your finger to draw directly on the screen. The tool smooths your strokes automatically.
- Position and download: Drag the signature to the correct position, resize it, and tap download to save the signed PDF to your Files app.
Signing on Android (Chrome)
The process is identical on Android. Open Chrome, navigate to the signing tool, upload your PDF, draw your signature with your finger, and download the signed file. Android's Chrome browser supports the same HTML5 canvas technology, so the drawing experience is equally smooth.
Using a stylus for better results
If your phone supports a stylus (Apple Pencil on iPad, S-Pen on Samsung Galaxy), you'll get the most natural-looking signature. The precision of a stylus captures the subtle variations in stroke width and curve that make a signature look hand-written rather than finger-drawn.
Pro tips for mobile signing
- Hold your phone in landscape mode for a wider signing canvas — it's easier to draw a full signature when the canvas is wider.
- Zoom in on the signature line before drawing to place your signature more precisely.
- Save your signature as a reusable file if you sign documents regularly. You can upload the same transparent PNG every time instead of redrawing.