Free Kindle delivery is temporarily unavailable
Amazon now requires every complete sender email address to be approved individually. Because this public tool does not use a signed-in KTool account, we can no longer offer reliable direct Kindle delivery here.
Sign in to KTool to find your unique sender email address and set up Kindle delivery.
How it works?
- 1. Upload an AZW3 file
- 2. KTool sends the download link to your Kindle
- 3. Download the AZW3 file using your Kindle web browser
Features at a glance
Enjoy higher quality ebooks without sideloading
- Send AZW3 ebooks to your Kindle in one click
- Download link delivered within 20s*
- Your file is automatically deleted after 60 minutes
[...] It's the best 'To Kindle' conversion I have come across so far.

Who am I?
I'm Daniel Nguyen. In June, I quit my job to start indie hacking full-time.
The idea of KTool first came to my mind when I was reading Ask HN: I'm a software engineer going blind, how should I prepare?
I've been wearing glasses since I was 5. My right eye is basically blind. Doctors said there is no chance to cure it.
I was genuinely scared. Like holy shit, if my left eye stops working, my life is done. Since then I've been very conscious about time spent on computer screens.
That's when I started using Kindle-related products: to offload as many reading materials as possible to the Kindle.
Then I ran into multiple limitations which led me to build KTool: a tool to send anything online to Kindle. Blog posts, Twitter threads, Hacker News discussions, AZW3 files, PDFs, newsletters... you name it.
I built this free tool for sending AZW3 files to your Kindle. If you want to read other content, give KTool a try.
That's me and my daughter, trying to build a profitable Internet business
If you're on Twitter, let's connect. I'm actively #buildinpublic there.
