How to Sign a PDF on iPhone for Free (No App, No Account)
Published: May 2026 · 4 min read
You're on your iPhone. A contract, permission slip, or tax form lands in your inbox. The sender needs it signed and returned within minutes — but you don't have a printer, a scanner, or any specialized app installed. The good news: you can sign a PDF on your iPhone for free using built‑in tools and privacy‑friendly browser utilities. Here's exactly how, step by step.
Method 1: Use Apple's Built‑in Markup Tool (Completely Free)
Your iPhone already includes a powerful PDF signing tool — no download required.
- Open the PDF — tap the PDF attachment in Mail, Messages, or locate it in the Files app.
- Tap the Markup icon — it looks like a pen tip inside a circle (top right on iPad, bottom right on iPhone).
- Tap the "+" button (bottom right) → select "Signature".
- Create your signature — use your finger to draw your signature on the screen. You can also use a stylus. Tap "Done" to save.
- Place the signature — drag it to the correct spot on the document. Pinch to resize if needed.
- Tap "Done" to save the signed PDF.
The signed PDF is now saved to your Files app, ready to attach to an email or message. This method is completely free, works offline, and leaves no copy on any server.
Method 2: Sign in Your Browser (Privacy‑Friendly Alternative)
If you need to sign a PDF and also need other tools — like merging, compressing, or cropping the document first — you can use a privacy‑friendly online PDF toolkit like PDFcone.
While PDFcone doesn't have a dedicated "sign PDF" tool, it excels at preparing your documents for signature:
- Crop the PDF — use the Crop PDF tool to remove margins so the signature field is clearly visible.
- Compress the PDF — use the Compress PDF tool to reduce file size before sending.
- Merge multiple documents — use the Merge PDF tool to combine the signed PDF with supporting files.
All PDFcone tools work entirely in your browser — your files never leave your iPhone. After preparing your PDF, use Apple's Markup tool to add the actual signature.
What About Free Signing Apps?
Many "free" PDF signing apps in the App Store have hidden costs:
- They limit you to 1–2 free signatures before requiring a subscription.
- They upload your files to their servers, compromising privacy.
- They add watermarks or branding to the signed PDF.
The built‑in Markup tool avoids all these problems. It's free, private, and already installed.
Need to Prepare PDFs on iPhone?
PDFcone offers a full suite of privacy‑first PDF tools that work perfectly on iPhone:
- Merge PDF — combine multiple files before or after signing.
- Crop PDF — trim margins with touch‑friendly drag handles.
- Compress PDF — reduce file size for email.
- Split PDF — extract specific pages.
- PDF to JPG — convert signed pages to images.
- JPG to PDF — convert photos of signed documents back to PDF.
Frequently Asked Questions
Is Apple's Markup signature legally valid?
Yes. Digital signatures created with Apple's Markup tool are legally valid in most countries for contracts, forms, and agreements. They function as an electronic signature, just like signing with a pen.
Can I sign a PDF on iPhone without Apple Pencil?
Absolutely. You can draw your signature with your finger on the iPhone screen. The process works identically with or without a stylus.
Does PDFcone have a signing tool?
Not yet — PDFcone focuses on PDF preparation tools (merge, crop, split, compress, convert). Use Apple's free Markup tool for the actual signature, and PDFcone for everything else.
Will my PDF stay private if I use Apple Markup?
Yes. Apple's Markup tool processes everything on‑device. Your PDF never leaves your iPhone.