So, you just downloaded a huge collection of books.
Maybe it’s a “Top 100 Sci-Fi Books” pack, or a collection of study materials. You are excited to read them on your Kindle. But when you look at the file, you hit two roadblocks:
- The file is a .zip or .rar archive. Your Kindle can’t read that.
- Once you open it, the books inside are in .epub format. Your Kindle prefers .mobi or .azw3.
Do you need to download heavy software like WinRAR and Calibre to fix this? No.
Here is the fastest, privacy-focused workflow to get those books onto your device using two free online tools.
Step 1: Unzip the Archive (Securely)
First, we need to get the actual book files out of that archive container.
Instead of installing software that might nag you to pay, use Unzip.Cool.
- Go to: https://unzip.cool
- Action: Drag and drop your .zip, .rar, or .7z file.
- Result: It extracts your files instantly. Click to download the specific books you want to read.
Why use Unzip.Cool? It’s designed for privacy. Your files are processed securely via HTTPS and are automatically deleted from the server after 1 hour. No trace is left behind.
Step 2: Convert to Kindle Format (Perfect Layout)
Now you have the book files, but they are likely in EPUB format. While Kindle can technically process EPUBs via email now, it often results in broken layouts or missing covers.
For the best reading experience, you should convert them to AZW3 (best for fonts) or MOBI (best for compatibility).
Use our sister tool, MyEbook.Cool.
- Go to: https://myebook.cool
- Action: Upload the EPUB files you just extracted.
- Select Format: Choose AZW3 or MOBI.
- Download: Get your Kindle-ready books in seconds.
Why MyEbook.Cool? It uses the industry-standard conversion engine (Calibre) under the hood, ensuring your table of contents and cover art remain perfect. And just like Unzip.Cool, it’s 100% free and privacy-first.
Conclusion: The “Cool” Workflow
Managing your digital library shouldn’t be a headache. By combining these two tools, you can go from a “downloaded compressed file” to “reading on Kindle” in under two minutes.
- For Unzipping: Unzip.Cool
- For Converting: MyEbook.Cool
Bookmark them both, and enjoy your reading!