How to Sign a PDF on Android: One Method That Works on Every Phone
Ask five Android users how to sign a PDF and you will get five different answers, because unlike iOS with its Markup tool, Android has no single built-in way to do it. Google Drive can open PDFs and, on many phones, offers annotation and even a signature option, but the exact features depend on your app version. Samsung phones have their own PDF touches, other brands ship their own viewers, and some phones open PDFs in whatever app won the default-handler lottery. The result: instructions that work on your phone may be useless on your colleague's.
The usual escape hatch is installing a signing app, and there are decent ones. But for a document you sign twice a year, an app means storage, permissions, an account prompt, and often a subscription pitch before you reach the pen. More quietly, many of those apps process your document on their servers, which is a strange trade for something as personal as your signature on a private contract.
The method that behaves identically on every Android phone lives in the browser. Open Chrome, or Firefox, or whatever you prefer, go to PdfWill's sign tool, and load the PDF from your Downloads folder or cloud storage. Create your signature by drawing with your fingertip, typing your name in a handwriting-style font, or uploading a photo of your real signature. Place it, resize it, done. The processing happens locally on your phone; the document and your signature are never uploaded, which you can verify by watching it work even in airplane mode after the page loads.
Because documents usually need more than a squiggle, the surrounding tools matter. The form filler automatically detects fillable fields, turning a rental application into a tap-and-type exercise instead of a text-box placement puzzle. After signing something sensitive, protect can add AES encryption with a password before the file goes back out through email or a chat app. And since it is all in the browser, the identical workflow is waiting on your tablet or desktop when the next document arrives there instead.
To be clear about scope: this places an image of your signature on the document, the modern equivalent of print-sign-scan, which is what the vast majority of everyday paperwork calls for. It is not a cryptographic digital certificate, and multi-party signing workflows with reminders and audit logs are a different tool for a different job. What it fixes is the actual Android problem: no matter which brand of phone is in your hand, the same URL, the same three steps, and the same private, local processing get the paper signed.