Privacy Policy

Last updated: 6 November 2026

The short version: your books and pictures stay on your device, unless you choose to publish a book online. We only keep your email if you start the free trial or publish online, and we use it for that and nothing else.

This page explains how Cherilov Flipbook Studio and Cherilov Reader (together, "Cherilov", "we", "us") handle information. We run Cherilov as a small independent studio ("Cherilov Studio"). We decide how your information is used, and you can reach us at cherilov.studio@gmail.com.

Your books and files stay with you

When you turn a PDF or pictures into a flipbook, or open a book in the Reader, the work happens inside your own browser. We do not upload your PDFs, pages, pictures or videos to our servers, and we cannot see them, unless you choose Publish online (see below). Your designs, settings, bookmarks and reading place are saved in your browser's own storage on your device. If you clear your browser data, they are removed. If you choose to record your own voice for a video, the sound is recorded in your browser and is not sent to us.

What we do collect

Free trial (Google sign-in). To give you one free Premium trial, you sign in with Google. We receive your Google account ID and email address, and we save them, with the time your trial started, so that each person gets one trial. We do not receive your Google password. We do not sell your email, share it for advertising, or use it for anything except the trial and replying to you.
Plans and license keys. When you subscribe to Plus or Premium, payment is handled entirely by Gumroad. We never see your card details. Gumroad sends you a license key. When you paste it into Cherilov, our key-check service passes the key to Gumroad to confirm that it is real and your membership is active. We save the key in your browser so you stay unlocked.
Online books (only if you use Publish online). When you publish a book online, you sign in with Google and we store a copy of that book (its pages, text, stickers and settings) together with its title, your Google account ID and email address, and, if you have one, your license key. Anyone who has the book's link or QR code can open and read it, so only publish books you are happy to share.
Email you send us. If you write to us, we keep your message and address so we can reply.

Why we use your information

We use your email and Google account ID to run the free trial you asked for and to stop the same person getting it twice. We use your license key to check that your paid plan is active. If you publish online, we use your Google account to know which online books are yours, and we show your online books to anyone who has their link. We use your messages to reply to you. We do not use any of it for advertising.

Other companies involved

Cloudflare hosts our website and the small services behind it. Like any website host, it may log technical details such as your IP address when you visit.
Google provides sign-in for the free trial (see Google's privacy policy) and the fonts used on our pages. When a page loads a font, your browser contacts Google's servers, so Google can see your IP address.
Gumroad handles payments and memberships (see Gumroad's privacy policy).
jsDelivr delivers a software library that powers the page-turning effect.

Keeping and deleting

We keep your trial record (Google account ID, email and start time) for as long as we offer the trial, so that a trial cannot be repeated. To have it deleted, email us from the same address. Online books stay online while your plan (or free trial) is active. You can delete one at any time in the Studio, and it is removed straight away. If your plan or trial ends, your online books go offline and are deleted 30 days later. To remove what is saved on your device, clear your browser data for this site, or use "Remove my key from this device" on the Plans screen.

Where information is stored

Trial records and online books are stored with Cloudflare, which has data centres in many countries. Your information may therefore be handled outside the country where you live. We only keep what we need.

Your rights

You can ask us to show you the information we keep about you, correct it, or delete it. Email us from the address you used. If you live in the European Union or the United Kingdom, you can also complain to your local data protection authority.

Children

Cherilov is not made for children under 13, and we do not knowingly collect information from them.

Changes

If we change how we handle information, we will update this page and its date.