How to sign a PDF on your phone (iPhone or Android)
No printer, no scanner, no app store. If a contract lands in your email, you can sign it from your phone’s browser in about a minute — and the file never leaves your device.
Just your phone’s browser (Safari, Chrome — any) and the PDF, from your Files app, an email attachment, or cloud storage.
Sign on your phone in 5 steps
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Open the editor on your phone
In your phone’s browser, go to amigopdf.com/edit.
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Load the PDF
Tap Open PDF and pick the file — from Files (iPhone), your file manager (Android), or a downloaded email attachment.
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Draw your signature
Tap Sign, then sign the pad with your finger. Redo it until it looks right.
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Place and size it
Tap Use signature, then tap the signature line. Pinch the corner handles to size it.
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Export and share back
Tap Export — the signed PDF saves to your downloads, ready to attach to a reply.
Tap the attachment to download it first, then choose it from Files / Downloads inside the editor. When you’re done, attach the exported copy to your reply.
Frequently asked questions
Do I need to install an app?
No — it runs entirely in your phone’s browser. Nothing to install, no account.
Does it work on both iPhone and Android?
Yes. Any modern mobile browser works — Safari, Chrome, Firefox, Samsung Internet.
Where does the signed PDF go?
To your browser’s downloads — the Files app on iPhone, or the Downloads folder on Android.
Is a finger-drawn signature acceptable?
For most everyday documents, yes — laws like the U.S. ESIGN Act recognise electronic signatures. For high-stakes contracts, check what the recipient requires. This is general information, not legal advice.
This guide is for general information. AmigoPDF is a free, in-browser utility; always keep a copy of your original files.