Pick a genre or two, or leave it open — recommendations are weighed against what's already on your shelf.
Add to your shelf
Upload a photo of your bookshelf. Spine text can be read even at an angle — Spine will pick out every title it can make out. Photos are resized before upload.
Amazon doesn't offer a way to import a Kindle library automatically — but a screenshot works just as well. Open your Kindle library or "Content & Devices" list, screenshot it (scroll and repeat for a long list), and upload the image(s) here.