How to Sign PDF On iPhone
Signing PDFs on your iPhone lets you approve contracts, sign forms, and authorize documents without a printer or desktop computer. While iOS has a built-in Markup tool for basic signatures, SublimePDF offers a more complete signing experience directly in Safari — with typed, drawn, and uploaded signature options, plus the ability to initial multiple pages and add dates automatically.
Follow the step-by-step instructions below, then use the free tool directly — no registration or download required.
Open Tool →How to Sign PDF On iPhone — Step by Step
Open the signing tool
Navigate to SublimePDF's sign tool in Safari on your iPhone. No app download required — the tool loads directly in your browser.
Upload your PDF
Tap the upload area to select a PDF from the Files app, email attachments, or iCloud Drive. The document loads with all pages visible for navigation.
Create your signature
Choose from three options: draw your signature with your finger on the touchscreen, type your name and select a signature font, or upload a photo of your handwritten signature.
Place your signature
Tap the signature field or any location on the document to place your signature. Pinch to resize it and drag to reposition it precisely on the signing line.
Add date and initials
Tap the date tool to insert today's date in the format required by the form. Use the initials tool to quickly initial additional pages.
Save the signed PDF
Tap save to flatten the signature into the document. Download the signed PDF or share it directly via Mail, Messages, or AirDrop.
Pro Tips
- 💡 Draw your signature with your finger in landscape mode for more control and a more natural-looking result.
- 💡 iOS Markup signatures (via the Files app) work for simple cases, but SublimePDF adds typed signatures, date stamps, and multi-page initialing that Markup lacks.
- 💡 Save your signature in SublimePDF so you don't have to redraw it every time — it persists in your browser for future documents.
- 💡 If the PDF has fillable form fields, tap them to type in your information before signing. SublimePDF detects and supports interactive form fields.
Privacy & Security
All processing happens directly in your browser. Your files are never uploaded to any server — they remain on your device throughout the entire process. SublimePDF uses WebAssembly technology for fast, secure, client-side processing.
Works Everywhere
This tool works on any modern browser — Chrome, Firefox, Safari, or Edge — on desktop, tablet, or mobile. No software to install. PDF is an open ISO standard supported by all major platforms.
How to Sign PDF On iPhone — FAQ
Is a signature made on iPhone legally binding?
How do I sign a PDF using iOS Markup?
Can I add multiple signatures to one document?
Does signing a PDF change the original file?
Related Guides
How to Sign a PDF Electronically
Electronic signatures are legally binding in most countries under laws like ESIGN (US), eIDAS (EU), and similar regulations. SublimePDF lets you sign any PDF for free — draw your signature, type it, or upload an image.
How to Sign PDF On Mac
Signing PDFs on your Mac is a daily necessity for contracts, NDAs, approval forms, and official correspondence. macOS Preview includes a basic signature tool using your trackpad or camera, but it's limited to one signature style and offers no date stamping or form-filling. SublimePDF provides a professional signing workflow in your browser with reusable signatures, typed and drawn options, and automatic date insertion.
How to Digital Vs Electronic Signatures
Understanding the difference between digital signatures and electronic signatures is essential for choosing the right signing method for your documents. While the terms are often used interchangeably, they serve different purposes: electronic signatures capture consent (like signing with your finger on a screen), while digital signatures use cryptographic certificates to verify identity and detect tampering. Choosing the wrong type can leave your documents legally vulnerable or unnecessarily complex.