The PDF format is one of the most universally used file formats, and the number of PDF users increases every day. From government officers to business managers, everybody has a use for PDFs. For every type of mobile device, there are PDF form filler Apps available, and some are even free. Luckily, many of the free PDF form filler Apps in this review are of exceptional quality.
Adobe Fill & Sign is a PDF filler App on Android phones that can be used for a variety of purposes including scanning files with the built-in camera and then edit it as a PDF document. You can even sign and email it after editing. Adobe Fill & Sign is more than a simple form filler App. It can be used to open files from an email, and can import or export files to your cloud storage provider.
Smart Forms is another form filling App on iPhone. It is not just an App to fill out forms, but can also be used to store and retrieve documents from the cloud. It can capture data from any PDF file, and create your own templates for future use. As well, it lets you manage your signatures. The App is totally free but there is a giant red "watermark" at the top of every page.
Lastly, the best PDF form filling App on Android in this list is Fill and Sign PDF Forms. It can fill and Sign any PDF form containing AcroFields. Attach photos, save created document, view it, mail it, share it, etc. But produced documents in demo/trial mode are watermarked.