How to add personal documents to Kindles and Kindle apps Users of Amazon’s Kindle app on iOS can now have documents delivered via email, a feature that has been available for some time for ...

You can sign a document on your iPhone through the Mail app, where you can use the markup tool to add your drawn signature. Here's how to do it.

Move and resize your signature while adding it to your document. Nelson Aguilar/CNET A small box that includes your signature will show up in the document, which you can then drag around and resize.