How to Sign a PDF on iPhone (Free, Offline, No Account)
Updated
Quick answer
Open the PDF in PDF Slayer, tap Sign, draw your signature with your finger or Apple Pencil, then drag it into position and resize it. Save or share the signed file. Everything happens on your iPhone — no account, no subscription, and the document is never uploaded.
Someone emails you a contract, a lease, or a permission slip and needs it back "signed and returned." You do not need a printer, a scanner, or a DocuSign subscription — your iPhone can do the whole job in under a minute.
Most e-signature services route your document through their servers. For a contract or anything with personal details, that is an unnecessary risk. PDF Slayer signs PDFs entirely on your device: the file never leaves your iPhone.
Sign a PDF with PDF Slayer
Open the PDF in PDF Slayer
Launch PDF Slayer and pick the file, or open the PDF from Mail or Files using the Share button and choose PDF Slayer.
Tap the Sign tool
Choose Sign from the tool menu to open the signature editor.
Draw your signature
Sign with your finger, or use an Apple Pencil on iPad for a cleaner line. You can redo it until it looks right.
Place and resize it
Drag the signature onto the signature line, then pinch to resize it so it fits naturally on the page.
Save and send it back
Save the signed PDF, then share it straight back through Mail, Messages, or any app. Your signature is saved for reuse next time.
Free on the App Store. Works 100% offline — your documents never leave your iPhone.
Get PDF Slayer FreeDo you need Adobe Acrobat or DocuSign to sign a PDF?
No. Adobe Acrobat and DocuSign are built for businesses that manage signature workflows across many people — audit trails, reminders, countersigning. If you just need to put your signature on a document and send it back, a subscription is overkill.
For most everyday paperwork — leases, offer letters, consent forms, invoices — a drawn signature placed on the PDF is exactly what the other side expects. If a document legally requires a certified digital signature with identity verification, the sender will typically tell you and provide their own platform.
What about the built-in iOS Markup tool?
iOS Markup (the pencil icon in Files and Mail) can also add a signature, and it is fine for a quick one-off. Where it falls short: it flattens your options for anything beyond a single signature, and it offers no way to also merge in extra pages, reorder them, or password-protect the result before you send it.
PDF Slayer keeps signing in the same place as the rest of your PDF workflow — sign a scan you just captured, merge it with a cover page, then lock it with a password, all without the file ever touching a server.
Frequently asked questions
Is it free to sign a PDF with PDF Slayer?
Yes. Download PDF Slayer from the App Store and sign PDFs with no account and no subscription required.
Is a drawn signature legally valid?
For most everyday documents, yes — electronic signatures are widely accepted for leases, forms, and business paperwork. For documents that require a certified digital signature or a notary, follow the sender’s specific instructions.
Can I save my signature and reuse it?
Yes. PDF Slayer stores your signature on your device so you can place it on future documents without redrawing it.
Is my document uploaded when I sign it?
No. PDF Slayer processes everything on your iPhone. It works in airplane mode — nothing is transmitted, ever.
Can I sign with an Apple Pencil on iPad?
Yes. On iPad, Apple Pencil gives you a smoother, more natural signature line than a finger.