Privacy Policy

Information You Actively Provide

When you use our services, the information you actively provide includes PDF files you upload and their contents, including document content, metadata, file names, etc. This information is only used to provide the PDF processing services you request, such as conversion, compression, merging, and other operations. If you choose to create an account, we collect personal identification information such as your username, email address, password (encrypted), avatar, etc. When you contact our customer service team, we keep your communication content, including problem descriptions, technical details, screenshots, and other information to provide better support and service follow-up.

For paid services, we may collect necessary payment information, but specific payment processing is handled by trusted third-party payment institutions, and we do not store your complete payment card information. We also collect product evaluations, feature suggestions, user experience reports, and other information you provide, which helps us improve service quality. Additionally, we record your personal preferences set while using the service, such as interface language, default conversion options, etc.

Automatically Collected Information

To provide better service and user experience, our system automatically collects certain technical information, including your device type, operating system version, browser type and version, screen resolution, device identifiers, etc. This information helps us optimize website display across different devices. We also collect your operation records on the website, such as pages visited, features used, time spent, etc., which helps us understand user habits and improve user experience.

We collect website performance-related data such as loading times, error logs, crash reports, and other technical metrics to monitor and improve service stability and performance. The system also records your IP address, network service provider information, timezone settings, and other data used to ensure service security and prevent potential abuse. Based on IP addresses, we may obtain your approximate location information for providing localized services and content, but we will not collect precise GPS location data unless explicitly authorized by you. We also record which website linked you to our service, which helps us understand user sources and optimize marketing strategies.

Service Provision and Improvement

The information we collect is primarily used to provide core PDF processing services, including file conversion, compression, merging, splitting, encryption, and other functions. During this process, we use your uploaded file content only for performing the specific operations you request and delete it from our system immediately after processing is complete. For account management, we use this information to help you create and manage accounts, verify login status, protect account security, and record your login history and account activities to prevent unauthorized access.

When you encounter problems, our customer service team will review relevant information to assist in resolving issues, including handling technical problems, answering inquiries, and processing complaints. We provide more relevant feature suggestions and custom settings based on your usage habits and preferences, including remembering your frequently used conversion settings and presets. We also send you service-related notifications such as processing completion reminders, system maintenance notices, and important update information. If you subscribe to our newsletter, we will also send you product news and promotional information. For paid services, we process necessary payment information to complete transactions and retain transaction records for accounting and legal compliance purposes.

Service Optimization and Analysis

Through analyzing website performance data, we continuously optimize server configuration, improve code efficiency, and enhance loading speed. This includes monitoring server response times, identifying performance bottlenecks, and optimizing resource allocation. We study how users use our services, identify common usage patterns and potential problem points, which helps us simplify operational processes, improve interface design, and add new practical features. By analyzing usage patterns and behavioral data, we can detect and prevent potential security threats such as unauthorized access attempts, abnormal usage behavior, and potential abuse.

We continuously monitor service quality indicators, including conversion accuracy, processing speed, error rates, etc., to ensure services consistently meet user needs. By understanding changing user needs, identifying most popular features and most common use cases, we can better plan product development direction. In terms of marketing, we evaluate marketing campaign effectiveness, understand how users learn about our services, and optimize our promotional strategies. These analyses are based on aggregate data and do not identify specific individuals.

Security Measures

For data transmission, we use industry-standard SSL/TLS encryption technology to protect all data transfers. Our website enforces HTTPS, ensuring your information cannot be stolen or tampered with during transmission. All file uploads and downloads are conducted through encrypted channels. In terms of access control, we implement strict authentication and permission management mechanisms. Only authorized employees can access user data, and all access activities are logged and audited. We regularly check and update access permissions to ensure compliance with the 'least privilege' principle.

Our servers employ the latest security patches and firewall protection, with regular security scans and vulnerability assessments. We have deployed intrusion detection systems to promptly identify and respond to potential security threats. Regarding data storage, different users' data is strictly isolated to prevent unauthorized access. We use advanced database security measures, including encrypted storage, access logs, and regular backups. We also conduct regular security awareness training for employees to ensure they understand and comply with data protection policies, and have established clear security incident response procedures to quickly address potential security issues. We regularly invite independent security experts to conduct security assessments and penetration testing to promptly identify and fix potential security vulnerabilities.

File Processing Security

All file processing operations are completed in your browser, meaning your file content is not transmitted to our servers. We use advanced Web technologies to ensure file processing is both secure and efficient. If temporary file storage is needed during processing, we use secure encrypted storage methods and immediately delete all temporary files after processing is complete. Temporary storage locations are in secure isolated environments. Our system design ensures that only file owners can access and process their own files, and even system administrators cannot access user file content. We implement strict access control mechanisms to prevent unauthorized access.

During file processing, we use memory-safe programming practices to ensure file data cannot be leaked or accessed by malicious programs. All file operations are conducted in a secure sandbox environment. If files need to be transferred between client and server, we use end-to-end encryption to protect the transfer process. All transmission channels are security-hardened to prevent man-in-the-middle attacks and data theft. We record key operation logs for file processing, but these do not include file content. These logs are used for security auditing and problem diagnosis, helping us ensure service security and reliability.

Cookie Usage Description

Regarding necessary cookies, these are essential for the website's basic functions, including maintaining your login status, remembering language preferences, saving processing settings, etc. Without these cookies, many website functions would not work properly. We strictly limit the scope of necessary cookies, collecting only information required for normal service operation. The analytical cookies we use help us understand how users interact with our website, collecting statistics about page visits, user sources, time spent, etc. We use this data to improve website design and performance. All analytical data is anonymous and does not identify specific users. We use industry-leading analytical tools to ensure data accuracy and security.

Functional cookies enable us to provide enhanced functionality and personalization. These may be set by us or trusted third-party service providers. If you do not allow these cookies, some or all features may not function properly. This includes saving your preferences, remembering common conversion options, etc. With your consent, we may use advertising cookies to deliver relevant advertisements. These cookies record your visit information, commonly used features, etc., helping us show advertisements more aligned with your interests. All advertising-related data collection follows strict privacy protection standards.

Cookie Management and Control

You can control cookies through your browser's privacy settings. Most browsers allow you to view, delete specific cookies, or block cookies entirely. Please note that if you choose to block cookies, certain website functions may not work properly. Our system responds to your browser settings and will not force the use of non-essential cookies. On our website, we provide a cookie preference settings center where you can view and change cookie settings at any time. You can choose to enable or disable different types of cookies, and we will remember and respect your choices. For necessary cookies, we clearly explain why they are required.

If you use ad blockers or privacy protection tools, they may automatically help manage your cookies. Our website design considers compatibility with these tools, ensuring core functions are not affected. For analytical and advertising cookies, we provide simple opt-out mechanisms. You can cancel the use of these cookies at any time, and we will immediately stop related data collection. Your choices will be saved unless you actively change settings. We recommend regularly checking and clearing cookies, especially when using public devices. Our cookies all have reasonable expiration times and will not be permanently stored on your device.

We regularly review and update this privacy policy to ensure its accuracy and timeliness. When we make significant changes to the privacy policy, we post update notices in prominent locations on the website, explaining the main changes and reasons. These notices remain visible for sufficient time to ensure users have adequate opportunity to understand the changes. We also remind users of important policy updates through pop-ups or banners when they log in. For registered users, we send emails detailing the content, reasons, and impact of policy changes. We allow reasonable time for users to understand and adapt to these changes.

We maintain a change log on the privacy policy page recording the history of all important updates. Users can view previous policy versions at any time to understand the policy's evolution. Policy updates typically take effect 30 days after publication, giving users sufficient time to understand and decide whether to continue using our services. For significant changes, we may extend this period. During policy updates, we welcome user feedback and suggestions. We carefully consider all user opinions and adjust policies when necessary.

Continued use of our services indicates your agreement to the updated privacy policy. We recommend regularly reviewing this policy to understand how we protect your privacy rights. If you disagree with the modified terms, you can stop using our services. We are always committed to processing your personal information transparently and fairly, striking the best balance between privacy protection and service quality.