Kobo Launches Stack Subscription for Personal Ebooks
The monthly service lets readers upload their own ebooks and documents and sync reading progress across Kobo devices and apps.
Updated on Nov. 6, 2026 in Data Centers
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Kobo has launched Stack, a monthly subscription that lets users upload EPUBs and PDFs up to 200MB and sync them across Kobo e-readers, the iOS and Android apps, and the Kobo website. The rollout is initially limited to Canada, Ireland, Australia, New Zealand, the UK, and Spain.
Why it matters
The service gives readers who use personal or non-store documents a single place to keep and sync their reading library. It also arrives alongside a 6.0 e-reader software update that adds Stack support.
Stack accepts EPUB and PDF files up to 200MB, which can be added by drag and drop on Kobo's website or by emailing a custom address Kobo issues to each subscriber. Supported e-readers are currently limited to the Clara BW, Clara Colour, Libra Colour, and Elipsa 2E, with access for devices made between 2018 and 2024 expected soon.
The players
Kobo
Kobo is a Canadian ebook retailer and e-reader manufacturer owned by Rakuten, known for its e-reader hardware and digital bookstore.
The details
Subscribers receive a custom email address for sending documents and can upload files through the web interface. Once uploaded, documents sync to the mobile apps, the Kobo website, and compatible e-readers. Kobo says it will keep cancelled users' files for a 60-day grace period before deletion.
Timeline
Kobo Stack launched on November 6, 2026.
New subscribers receive a 90-day free trial.
Cancelled users have a 60-day grace period before their files are deleted.
The 6.0 e-reader update will receive a wider official release after its beta period.
The Tech Race
Kobo's Stack follows the personal-document upload model Amazon established with Send to Kindle, but adds cross-device reading-progress and annotation sync under a paid subscription. The move positions Kobo to compete on sync and file portability rather than only on hardware.
Readers who keep personal documents on their Kobo devices can now sync them automatically across apps and e-readers for a monthly fee. Subscribers outside the initial rollout countries will need to wait for a wider launch.
The takeaway
If you read personal documents on a Kobo, the 90-day free trial lets you test whether cross-device sync is worth a monthly fee before you commit. Check the supported e-reader list before subscribing to confirm your device is covered.
Further reading
Learn more about how the cloud infrastructure behind services like this is run in our Data Centers coverage.
Source note: This article includes information reported by The Verge.
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Would you pay a monthly subscription to store and sync your own ebooks?
