Terms of Service
Last updated: November 8, 2026
This is an English translation of the Japanese original, with additional information for users in the EU, the EEA and the UK. If the two versions differ, the Japanese version prevails, except that this never limits any rights you have under the mandatory consumer-protection or data-protection laws of the country where you live.
These Terms of Service (the "Terms") set out the conditions for using Riffle (the "Service"), which is provided by 及川 寛太 (the "Operator"). Everyone who uses the Service (a "User") uses it on the condition that they agree to these Terms.
Article 1 (The Service)
The Service is a web application that lets Users read PDF files they have uploaded in their browser, turning the pages like a book. Users sign in with a Google account and get their own personal bookshelf. Users can also share books on their bookshelf with specific Users, or with anyone who has the link.
Article 2 (Accounts)
- Users can use the Service by signing in with a Google account.
- Users are responsible for managing their own accounts, and must not allow third parties to use their accounts or transfer or lend their accounts to anyone.
- The Operator is not liable for any damage caused by unauthorized use of an account, unless the Operator acted intentionally or with gross negligence.
- Minors must obtain the consent of a parent or other legal guardian before using the Service.
Article 3 (User Content)
- Rights in the PDF files you upload, their titles and similar material ("User Content") remain with the User or the rightful owner, and are not transferred to the Operator.
- Users grant the Operator a free-of-charge right to use User Content to the extent necessary to provide the Service (including storing and displaying it, generating thumbnails, delivering it through the sharing features, and backing it up).
- Users warrant that they have the legitimate right to upload and share their User Content, and that it does not infringe the rights of any third party.
- If a dispute arises with a third party about User Content, the User will resolve it at their own responsibility and expense.
Article 4 (Sharing)
- Users can share their own books, with view-only permission, with specific Users identified by email address, or with everyone who has the link.
- With link sharing, anyone who has the link can read the book without signing in. Users are responsible for handling the link and controlling who it reaches. A link can be disabled or reissued at any time.
- The Operator is not responsible for how the people a book is shared with, or the viewers of a link, use the content.
Article 5 (Prohibited Conduct)
Users must not do any of the following when using the Service.
- Acting in violation of laws or public order and morals
- Uploading or sharing content that infringes copyrights, trademarks, privacy, publicity rights, or other rights of third parties
- Uploading or sharing content that is obscene, sexually exploits children, is excessively violent, or is discriminatory or defamatory
- Uploading files that contain harmful programs such as computer viruses
- Using the Service in bulk as a place to distribute content to third parties (including use whose main purpose is distributing to an unspecified number of people through share links)
- Placing an excessive load on the Service's servers or network, unauthorized access, reverse engineering, or circumventing any of the Service's limits
- Impersonating another User or a third party
- Acting in a way that disadvantages or harms the Operator or a third party
- Any other conduct the Operator considers inappropriate
Article 6 (Restriction, Suspension and Deletion)
If the Operator determines that a User has violated, or may violate, these Terms, the Operator may, without prior notice, delete the relevant content, stop sharing, restrict uploads, or suspend or delete the account. The Operator is not liable for any damage this causes to the User.
Article 7 (Deleting Your Account)
- Users can delete their account at any time from the settings screen.
- When an account is deleted, the User's books (PDFs and thumbnails), sharing settings and account information are all deleted and cannot be restored. Books that were being shared immediately become unreadable for viewers too.
- Because of how database backups work, data from before the deletion may remain in backups for up to 30 days. See the Privacy Policy for details.
Article 8 (Changing, Interrupting and Ending the Service)
- The Operator may change the Service or temporarily interrupt it without prior notice to Users. This includes interruptions caused by maintenance, failures, natural disasters, or failures of external services (such as Google or Cloudflare).
- The Operator may end the Service after announcing it on the Service with reasonable advance notice.
- The Operator does not guarantee the storage or availability of User Content. Please also keep your important files yourself.
Article 9 (Plans and the Paid Plan)
- The Service has a free plan and a paid "Pro plan". The features and limits of each plan (such as the number of books you can keep, the size per book, the storage period, and sharing with specific Users) are shown on the Pricing page of the Service. The Operator may change the contents and limits of the plans after announcing it with reasonable advance notice.
- The price of the Pro plan is shown on the Pricing page and on the checkout screen, in the currency shown there. Payment is made through the payment service provider the Operator engages (Stripe, Inc.), by the methods shown on the checkout screen, such as credit card. Taxes, where applicable, are shown on the checkout screen.
- The Pro plan renews automatically each billing period, and the fee is charged, until you cancel. Users can cancel at any time from "Manage subscription" on the Pricing page. Even after cancelling, you can keep using the Pro plan until the end of the billing period you have already paid for. Cancelling partway through a billing period does not entitle you to a pro-rated refund, except as described in paragraph 6 below.
- If payment of the fee cannot be confirmed (for example because a card has expired or has insufficient funds), the Operator may stop providing the Pro plan.
- If a Pro plan subscription ends and you return to the free plan, the following applies.
- Books older than the free plan's storage period (30 days from upload) become unreadable.
- If the number of books within the storage period exceeds the free plan's limit, the User chooses which books to keep. Books that are not chosen are treated like books past the storage period.
- Books that have become unreadable are permanently deleted 7 days after the day you returned to the free plan, and cannot be restored. If you have not made a choice by then, the newest books are kept up to the limit and the rest are deleted. If you return to the Pro plan before deletion, the books can be read again.
- Books that have become unreadable also become unreadable for the Users they are shared with and for anyone who has the link. Sharing with specific Users can no longer be added.
- Right of withdrawal for consumers in the EU, the EEA and the UK. If you are a consumer who lives in the EU, the EEA or the UK, you have the right to withdraw from a Pro plan subscription within 14 days of subscribing, without giving a reason. To withdraw, send a clear statement to contact@riffle.page within that period. If you asked for the Pro plan to start immediately, which is what happens when you subscribe, you must pay a proportionate amount for the period until you withdraw, and we will refund the rest. If the Pro plan has been fully provided, the right of withdrawal ends. This paragraph does not limit any rights you have under mandatory consumer-protection law.
- If you have a paid plan when you delete your account, the subscription is cancelled as part of the deletion procedure. If it cannot be cancelled, the account deletion cannot be completed.
- The Operator may change the fees. If it does, it will announce the change on the Service in advance, and the new fee applies from the next billing period.
- Details about fees, payment methods, cancellation and refunds are also shown in the Legal Notice (Japan).
Article 10 (Disclaimer)
- The Service is provided "as is". The Operator does not guarantee that the Service is fit for a particular purpose, that it is free of errors or failures, or that PDFs are displayed as intended.
- The Operator is not liable for any damage to a User caused by using or being unable to use the Service, unless the Operator acted intentionally or with gross negligence.
- Even if the Operator is negligent, its liability is limited to the direct damage that would ordinarily arise. However, where the Consumer Contract Act or other laws do not permit a limitation of liability, those laws apply.
- The Operator does not get involved in, and is not liable for, disputes between Users or between a User and a third party.
Article 11 (Reporting Infringement)
If you believe content on the Service infringes your rights, please contact us at the address at the end of these Terms. We will review the report and, where necessary, take action such as removing the content.
Article 12 (Changes to These Terms)
The Operator may change these Terms when it considers it necessary. The changed Terms take effect when they are posted on the Service. Important changes will be announced on the Service. If you use the Service after a change, you are deemed to have agreed to the changed Terms.
Article 13 (Governing Law and Jurisdiction)
- These Terms are governed by and interpreted under the laws of Japan.
- If a dispute arises about the Service, the district court with jurisdiction over the Operator's location is the exclusive court of first instance by agreement.
- If you are a consumer, the above does not take away the protection of the mandatory provisions of the law of the country where you usually live, and does not prevent you from bringing a claim in the courts of that country where the law allows it.
Contact
Riffle Operations Team
Email: contact@riffle.page