Sign PDFs on Android

Android devices do not include a built-in PDF signing tool, which means most people resort to downloading third-party apps from the Google Play Store. Many of those apps are bloated with ads, require invasive permissions, or lock basic features behind paywalls. SigPDF eliminates all of that. It is a browser-based PDF signing tool that works directly in Chrome, Samsung Internet, Firefox, Brave, Opera, or any other browser installed on your Android device. You simply open the website, upload your PDF, and sign it using your finger on the touchscreen. There is nothing to install, no account to create, and no ads to deal with.

SigPDF has been designed with mobile users in mind. The interface automatically adapts to your Android phone's screen size, whether you are using a compact device like the Pixel 8a or a larger phone like the Samsung Galaxy S24 Ultra. The signature drawing pad is optimized for finger input, capturing smooth and natural-looking strokes even on smaller screens. If you prefer not to draw, you can type your name and select from several handwriting-style fonts, or upload a photo of your existing signature. You can also add text fields for dates, initials, and other details that documents typically require.

One of the key advantages of SigPDF is privacy. When you sign a PDF on your Android device, the document is processed entirely within your browser. It is never uploaded to a remote server, which means nobody else can access your files. This is particularly important for sensitive documents like employment contracts, NDAs, medical forms, and financial agreements. Many popular PDF apps on the Play Store upload your documents to their cloud servers for processing, which raises serious privacy concerns. With SigPDF, everything stays on your device.

SigPDF works on all Android devices running Android 10 or later. It is compatible with phones and tablets from Samsung, Google Pixel, OnePlus, Xiaomi, Motorola, Oppo, and other manufacturers. The tool supports multi-page PDFs, so you can scroll through a long contract and place signatures, initials, and dates on every page that requires them. Once you are finished, tap the download button to save the signed PDF directly to your phone's Downloads folder. You can then share it via email, WhatsApp, Google Drive, or any other app on your Android device.

Step-by-Step: Sign a PDF on Android

1. Open Chrome, Samsung Internet, or any browser on your Android phone
2. Navigate to SigPDF and tap the upload area
3. Select a PDF from your device storage, Google Drive, or recent downloads
4. Draw your signature with your finger, type your name, or upload a signature image
5. Tap on the document to place your signature, then drag to reposition or pinch to resize
6. Add text, dates, or initials to any page as needed
7. Tap “Download” to save the signed PDF to your Android device