Terms of Use

Last updated: July 24, 2026

1. Acceptance of Terms

By downloading, installing, or using Sign PDF ("App"), you agree to be bound by these Terms of Use ("Terms"). If you do not agree, do not use the App. These Terms constitute a legal agreement between you and Keysersoft ("we", "us", or "our"). We may modify these Terms at any time, and such modifications are effective upon posting.

2. License Grant

Subject to your compliance with these Terms, we grant you a limited, non-exclusive, non-transferable, revocable license to download, install, and use the App for your personal purposes on a device that you own or control.

You may not:

  • Copy, modify, or distribute the App
  • Reverse engineer, decompile, or disassemble the App
  • Rent, lease, lend, sell, or sublicense the App
  • Use the App for any illegal or unauthorized purpose
  • Remove any copyright or proprietary notices from the App

3. Your Documents and Signatures

The App lets you open, fill, and sign PDF documents ("User Content"). You retain all rights to your User Content. Your documents and signatures are processed and stored only on your device and are never uploaded to us. You represent and warrant that:

  • You own or have the necessary rights to the documents you edit and sign
  • Your use of the App does not violate any third-party rights or applicable law
  • You are authorized to apply any signature you create or place on a document

You are solely responsible for the content and legal use of the documents you create with the App.

4. Nature of Signatures

Sign PDF produces standard signed PDF documents by placing your signature, text, and other annotations onto the page. The App is a convenience tool and does not provide qualified, certified, or notarized electronic signatures (such as eIDAS qualified signatures) and does not itself guarantee the legal enforceability of any document. Whether a signed document is legally binding depends on the applicable law and the parties involved. You are responsible for ensuring the App is suitable for your intended use.

5. Subscriptions and In-App Purchases

The App is free to download and includes core features. Additional "Pro" features are available through an auto-renewable subscription or a one-time lifetime purchase. All purchases are processed through the Apple App Store and are subject to Apple's terms.

  • Subscription options: a weekly plan (with an introductory free trial where offered) and a yearly plan. A one-time non-consumable "Lifetime" unlock is also available.
  • Free trial: if you start a free trial, any unused portion is forfeited when you purchase a subscription, where applicable.
  • Auto-renewal: subscriptions automatically renew at the then-current price unless auto-renew is turned off at least 24 hours before the end of the current period. Your Apple ID account is charged for renewal within 24 hours prior to the end of the current period.
  • Managing and cancelling: you can manage or cancel your subscription in the App Store: open Settings > your name > Subscriptions. Cancellation takes effect at the end of the current billing period.
  • Prices: prices are shown in the App and may vary by region and over time. Payment is charged to your Apple ID.
  • Refunds: purchases are handled by Apple; refund requests must be made to Apple via reportaproblem.apple.com.
  • Restore: the Lifetime unlock is tied to your Apple ID and can be restored on your devices.

6. Intellectual Property

The App, including its design, features, content, and functionality, is owned by Keysersoft and is protected by copyright, trademark, and other intellectual property laws. The App's name, logo, and related names, logos, and slogans are trademarks of Keysersoft.

7. Disclaimer of Warranties

THE APP IS PROVIDED "AS IS" AND "AS AVAILABLE" WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT. We do not warrant that the App will be uninterrupted or error-free. You use the App at your own risk.

8. Limitation of Liability

TO THE MAXIMUM EXTENT PERMITTED BY LAW, KEYSERSOFT SHALL NOT BE LIABLE FOR ANY INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, OR PUNITIVE DAMAGES, OR ANY LOSS OF PROFITS, DATA, USE, OR GOODWILL, RESULTING FROM YOUR USE OF OR INABILITY TO USE THE APP OR ANY DOCUMENTS CREATED WITH IT.

9. Indemnification

You agree to indemnify, defend, and hold harmless Keysersoft and its officers, directors, employees, and agents from any claims, damages, losses, liabilities, and expenses (including legal fees) arising from your use of the App or violation of these Terms.

10. Termination

We may terminate or suspend your access to the App at any time, without prior notice, for any reason, including if you breach these Terms. Upon termination, your right to use the App will immediately cease.

11. Governing Law

These Terms shall be governed by and construed in accordance with the laws of Germany, without regard to its conflict of law provisions. Any disputes shall be subject to the exclusive jurisdiction of the courts in Germany.

12. Severability

If any provision of these Terms is found to be unenforceable, the remaining provisions will continue in full force and effect.

13. Contact Us

If you have any questions about these Terms, please contact us at:

Keysersoft
Email: [email protected]