How to sign a PDF on Android — without installing an app
To sign a PDF on Android, open Sign PDF in Chrome, choose the file, draw your name with a finger, drag it onto the line and tap Apply. There is no app to install and nothing is uploaded — the file is signed on your phone.
Search how to sign a PDF on an Android phone and every answer tells you to install something: Adobe Acrobat Reader, Xodo, Dropbox, your Samsung's own Notes app. That is not laziness on their part. Unlike an iPhone, which has a signing tool built into the system, Android has no single equivalent that works everywhere, so the reflex is to reach for the Play Store. You do not have to. A browser tab can do the same job, and it is the honest first answer for a document you just need signed and sent back.
How do you do a signature on an Android phone?
Open Sign PDF in Chrome, choose the file, and draw your name with a finger. Drag the signature onto the line, resize it from a corner, and tap Apply signature. Chrome saves a signed copy to your Downloads. No app, no account, no connection needed.
Open the tool in Chrome
Open Sign PDF. It loads as an ordinary web page — there is nothing to install from the Play Store and no account to make.
Choose the PDF
Tap the upload area and pick the file from Downloads, Drive or wherever it lives. Every page is rendered on the phone first, so a long document takes a moment before the signature pad appears.
Sign with your finger
Draw on the pad in black or blue ink. Or switch to Type and enter your name to have it set in a script face.
Confirm it
Tap Use signature. It is trimmed to its own edges, so the empty space around your name does not become empty space around the placed image.
Place it and apply
Drag the signature onto the line, resize it from a corner handle, then tap Apply signature. The signed copy downloads with _signed on the end of the name.
Is there a free way to sign a PDF on Android?
Yes, and this is one. It is free with no account, no watermark and no page limit, because there is nothing to charge for: your file is read, drawn on and saved inside the browser on your phone, and nothing is uploaded to a server. Several of the apps the search results push do the signing on their own servers.
That difference is worth a second. Docusign's own guide describes the first step as uploading your document to its app; a browser tool that runs on the phone never sends the contract anywhere. For a PDF you would rather not hand to a third party — a lease, a medical form, anything with your address on it — that is the whole point.
How do I create a signature on my Android phone?
Draw it with a finger, which is the one part of this a phone does better than a laptop. The signature pad switches off the browser's own touch scrolling, so a finger dragged across it draws a line rather than sliding the page — the same thing Samsung Notes makes you turn on by hand as "finger drawing mode".
Typing your name instead is where Android quietly differs from an iPhone. The typed face asks for Segoe Script, then Bradley Hand, then Brush Script MT — a Windows font, then an Apple one, then another Microsoft one. An iPhone has Bradley Hand and lands on it. A typical Android phone ships none of the three, so the request falls all the way through to the generic cursive the browser keeps for the purpose, and your typed name can look plainer than you expected. The preview shows you exactly what you will get, so look at it before you commit.
Draw rather than type when it matters. A drawn mark at least looks like yours; a typed name in a fallback font on Android often barely looks like handwriting at all. And placement is handed to the PDF as a fraction of the page rather than as pixels on your screen, which is why a signature aimed on a narrow phone lands in exactly the same spot it would from a wide desktop — a small screen costs you precision while aiming, not accuracy in the result.
How do I sign a PDF document that was emailed to me?
Save it out of the email first. The Gmail app shows a PDF in its own preview, which lets you look but not sign. Tap the download icon to put the file in your phone, then open Sign PDF and pick the saved copy.
Sending it back is the step people forget. The signed file is a separate new copy with _signed on the end of the name — the original you downloaded is untouched. When you reply, attach the _signed one, not the file you opened out of the email.
Is this a digital signature?
No. This adds a picture of your signature to the page. A digital signature is a cryptographic certificate bound to the document's exact bytes, which proves who signed and reveals any change made afterwards — a different thing that no draw-on-the-page tool, app or browser, produces.
The distinction matters more than it sounds. A drawn signature carries no identity check and no timestamp, which for a delivery note, an internal sign-off or a school form is completely adequate and always has been. For an employment contract or anything a court might read, use a qualified e-signature service. Drawn, typed, digital: three kinds of PDF signature lays out which is which and when each one is enough.
What the signed file comes out like
- The page is not flattened into a picture. We stamped a signature onto a test document and read the result back with a different library than the one that wrote it: the text underneath was still there and still selectable, and exactly one image had been added, on exactly one page.
- Fillable form fields survive. On the same test the document's existing form field and the value typed into it were both still present and still editable after signing — so you can sign a form you have already filled in without wiping it.
- One signature, one page, per pass. A contract needing initials on three pages is three rounds of sign, download and re-open — worth knowing before you start rather than at page two.
- Your original is untouched. What you get back is a new copy ending in _signed.
All of it happens in the Chrome tab you already have open, on the phone in your hand. How to sign a PDF covers the desktop flow and the placement details in full, signing on an iPhone covers the Apple route, and if the document has real form fields to complete as well, Fill PDF Forms handles those first.
