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How to sign a PDF on Android

Android handles PDFs well enough to read them, but doing anything structural — merging, splitting, editing — normally sends you to the Play Store for an app that wants storage permissions and a subscription, or to a website that uploads your document to a server. Doing it in the browser skips the install and keeps the file on your phone.

Signing is the classic mobile job — a contract arrives by email and you need it signed and returned without finding a printer, a scanner and a pen.

Open Sign PDF →

Step by step on Android

  1. 1Open the Sign PDF tool and upload your document.
  2. 2Draw or type your signature in the side panel.
  3. 3Click on the page to place it, drag to position, then download the signed PDF.

Tapping the file button opens Android's document picker, which reaches internal storage, the SD card, Google Drive and Downloads. Pick your PDF from whichever of those it lives in.

Where the finished file is saved on Android

Chrome puts finished files in your Downloads folder, reachable from the Files (or My Files) app and from Chrome's own Downloads screen. A notification appears the moment the file is saved — tap it to open or share.

What Android can’t do on its own

Android's built-in PDF viewer is read-only. There's no stock way to combine documents, delete pages or add text, which is why the Play Store is full of apps charging for exactly that.

FAQ

Does this work without installing an app from the Play Store?
Yes — it runs entirely in Chrome (or any modern Android browser). No install, no storage permissions, no subscription.
Will this work on a budget or older Android phone?
Generally yes. Processing happens on your device, so very large documents depend on your phone's memory, but everyday files work fine on modest hardware.
Is a drawn signature legally valid?
In many places a simple electronic signature is accepted for everyday agreements. For legally-certified digital signatures with a certificate, use a dedicated e-signature service.
Can I place my signature on any page?
Yes — click anywhere on any page to drop your signature, then drag and resize it, and add it in as many spots as you need.
Is pdfcdf free to use?
Yes. Every tool on pdfcdf is completely free, with no account, no watermarks, and no limits on how many files you process.
Are my files safe? Do they get uploaded?
Your files never leave your device. Every tool runs entirely in your browser, so your documents are processed locally and are never uploaded to a server or seen by anyone.
Do I need to create an account or sign up?
No. pdfcdf works instantly with no sign-up, no email, and no software to install — just open the tool and go.
Does it work on mobile phones and tablets?
Yes. pdfcdf runs in any modern browser on phones, tablets, Mac, Windows and Linux — nothing to download.

Ready to sign a PDF on your Android?

Open Sign PDF →

Same tool, other devices

Sign a PDF on iPhoneSign a PDF on MacSign a PDF on WindowsSign a PDF on ChromebookSign a PDF on iPad

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