PDF you are using for an app project, you will be prompted with various options to fill out the form with your phone. Tap to Add/Edit/Remove Signature and choose your own signature. Smartphone apps to fill out forms with your mobile devices on your iPad, iPhone, and Android Phones Adobe Fill & Sign online fill and sign tool Apple has its own fill and sign tool when you have connected a PDF file to your iOS device and opened it in its free Adobe Acrobat mobile application. In the following screenshot we are filling out the purchase form for some books with a PDF file on the iPad. As shown in the screenshot the Apple Fill & Sign app will automatically recognize the PDF, automatically fill out the form and create a signature for us even though we used Adobe Fill & Sign online for this PDF file. We saved time by using the app for this PDF document rather than for filling out the form by hand but if we didn't have the app the form would have to have been saved by hand. Fill & Sign and the Adobe Acrobat Mobile App You can also use a free browser to fill out your Adobe Fill & Sign PDF forms. If you don't have Adobe Fill & Sign online for iOS, and you use a smartphone to fill out form on a desktop or laptop, you might want to check out the free online fill and sign tool for smartphones (Google Chrome) to save you time. Fill and sign from the iPhone or iPad in Chrome How to fill out a PDF from the browser in Chrome If you prefer to fill out forms using your Android phone, you can use Adobe's Online Fill & Sign for Android tool which is very similar to the online fill and sign tool available to iOS users. It was created by Adobe and is based on the offline Fill & Sign website by Adobe. The main differences you will find in Adobe's Fill & Sign for Android is that Fill & Sign mobile is completely free, has the option to save fill and signatures onto your phone and there are no mobile access errors.