Kobo Launches Stack to Sync Your Own EPUB and PDF Files

Kobo is launching Stack, a monthly subscription for uploading your own EPUB (open ebook format) and PDF files up to 200MB. It syncs reading progress, highlights and annotations across Kobo's apps, website and supported e-readers. The initial rollout covers Canada, Ireland, Australia, New Zealand, the UK and Spain, but not the US. A 90-day free trial is offered.