How to Sign a PDF on Your Phone — iPhone & Android, No App Needed

Someone emailed you a PDF to sign. You're on your phone. No printer, no computer. Here's how to sign it in 60 seconds with just your finger — no app download.

Sign on iPhone (No App)

1. Open Safari and go to the free PDF signer
2. Tap "Choose File" and select the PDF from Files, iCloud, or email attachment
3. Draw your signature with your finger on the touchscreen
4. Select the page and position (bottom-right, bottom-left, center)
5. Tap Sign — the signed PDF downloads to your Files app
6. Open Files app → Share → email it back

Sign on Android (No App)

1. Open Chrome and go to the free PDF signer
2. Tap "Choose File" and select the PDF from Downloads or Files
3. Draw your signature with your finger
4. Select page and position
5. Tap Sign — downloads to your Downloads folder
6. Open the signed PDF and share via email or messaging app

Phone vs. App vs. Computer

Method	Ease	Quality	Install
Browser on phone (finger)	✓ Fastest	~Good (finger is less precise)	✓ None
Browser on computer (mouse)	✓ Fast	✓ Best (mouse precision)	✓ None
Dedicated app (Adobe Sign, DocuSign)	~Setup required	✓ Good	✗ App download + account
Apple Markup (iPhone only)	✓ Built-in	~Basic	✓ None
Print, sign, scan	✗ Slowest	✓ Pen signature	✗ Printer + scanner needed

Tips for Better Phone Signatures

• Use your index finger, not thumb — more control for cursive signatures
• Rotate to landscape — gives you more drawing space
• Use a stylus if you have one — produces the most pen-like signature
• Type instead of draw if your finger signature looks messy — typed signatures are equally valid

After Signing: Complete the Workflow

• Fill PDF Forms — type into form fields before signing
• Compress PDF — shrink the signed PDF for email
• Merge PDFs — combine the signed document with attachments