Frequently Asked Questions
Everything you need to know about Stack to Book
Does Substack have a Kindle app?
No, Substack does not have an official Kindle app. However, you can use Stack to Book to convert any Substack newsletter into an EPUB file and send it to your Kindle using Amazon's Send to Kindle feature.
Can I read Substack offline?
Yes. Convert your favorite Substack to an EPUB with Stack to Book, then download it to any e-reader, tablet, or phone. Once downloaded, you can read offline anywhere.
What is Stack to Book?
Stack to Book is a free tool that converts any public Substack newsletter into a Kindle-compatible EPUB file. Paste a URL, get a book. No signup, no software to install.
Is Stack to Book free?
Yes, completely free. No hidden fees, no premium tier, no account required.
Does it work with paid or paywalled Substacks?
Stack to Book only converts publicly available posts. Paywalled content is automatically skipped during conversion.
What devices can read the EPUB files?
EPUBs work on Kindle (via Send to Kindle), iPad, Kobo, Nook, and any e-reader or app that supports EPUB format. Most reading apps on phones and tablets support EPUB too.
How do I send an EPUB to my Kindle?
Use Amazon's Send to Kindle feature: email the EPUB to your Kindle email address, or use the Send to Kindle app. Amazon automatically converts EPUB to Kindle format.
How long does conversion take?
Most newsletters convert in under 60 seconds. Larger archives with hundreds of posts may take a few minutes.
Is my data stored or shared?
We don't store your personal data. Converted books shared to the gallery are publicly visible. Books you download directly are not stored on our servers.
Can I customize the ebook format?
Currently, Stack to Book generates a standard EPUB with automatic formatting. We optimize for readability across devices. Custom styling isn't available yet.
What newsletters work best?
Any public Substack works. Text-heavy newsletters convert beautifully. Image-heavy posts are included but may display differently across e-readers.
I'm a Substack writer. Can I use this for my subscribers?
Absolutely. Convert your newsletter, share the gallery link with subscribers, or download and distribute the EPUB directly. It's a free way to offer your content in book format.
What's different from Calibre or other converters?
Calibre is powerful but requires installing software and manual setup. Stack to Book is instant: paste a URL in your browser, get an EPUB. No installation, no configuration.
Do you support other newsletter platforms?
Currently only Substack. Other platforms may be added based on demand.
Ready to convert your first newsletter?
Try Stack to Book