Kindle ereaders and apps support PDF format but they don’t have PDF reflow built-in like some ereaders and apps.
However, there is an easy way to convert PDFs to Kindle format, which essentially does the same thing as reflow.
If you’re wondering what PDF reflow is, it basically converts static PDF pages to text that automatically adjusts to fit the page, much like an ebook.
This makes it so you can increase and decrease font size and use other ebook-related features that aren’t available for PDFs.
Some ereaders have PDF reflow built-in to the software, like the Nook and many Android ereaders.
The software will show the PDF normally but if you select to increase font size it will reflow the document.
Reflow works well for text-based documents, but it generally doesn’t work well for PDFs with lots of images, graphs, multiple columns, and advanced formatting, and it certainly isn’t going to work for scanned PDFs.
But reflow can work wonders for manuals and research articles that are mostly text. Reflow sometimes works well with PDFs that have lots of embedded images too, but sometimes the formatting gets a little weird the way text wraps around images.
How to Use Kindle PDF Reflow
Amazon can convert your PDFs to Kindle format for free (as long as they are delivered over Wi-Fi) and that does the same kind of thing as reflow. In fact the last time I checked Amazon’s conversion did a much better job reflowing PDFs than Adobe’s PDF reflow on devices like the Nook.
There are a couple of different ways to have Amazon convert PDFs to Kindle format (AZW).
1. You can send PDFs to your Kindle simply by attaching them to an email and sending them to your Kindle’s email address. You just have to put “convert” in the subject line or it will send the PDF as is. You can find your Kindle’s unique email address (Kindle apps too) in the settings menu and from the Manage Your Devices section at Amazon.
See Amazon’s Send to Kindle eMail help page for more info.
2. Another option is to use Amazon’s Send to Kindle app from your computer. With that installed all you have to do is right-click on any PDF on your computer and select Send to Kindle.
By default, the Send to Kindle app will send PDFs without converting them. You have to open settings and click the box to have PDFs converted, as shown in the screenshot above.