ImagesToPDF (com.bfrontier.imagestopdfunlimited) on Google Play
You can convert images ( jpeg files in gallery ) to a PDF file.You should try the free version ( https://play.google.com/store/apps/details?id=com.bfrontier.imagestopdf ) before purchase.How to use?1. Launch the gallery app to pick images.2. Pick images by long tap. You can select a folder or multiple images.3. Touch Share menu, Select ImagesToPDF.4. Push Yes button.5. Now you can view PDF ( tap the file name ) or share PDF ( long tap ). The PDF file is saved in SDCard/ImagesToPDF folder.DisclaimerThis app is provided "as is", without warranty of any kind.Your use of the app is at your own risk.