Privacy Policy

Last Updated: September 2026

1. Client-Side Data & Zero-Server Guarantee

At Flitten, we hold privacy as a foundational engineering principle. All interactive tools, calculators, file conversion utilities (including WebP image compressors, PDF splitters and mergers, and cryptographic hash engines), and e-book parsing scripts operate entirely within your local web browser client.

Your input files, documents, passwords, or computational data are never transmitted, uploaded, stored, or processed on our servers or any remote third-party database. When you close or refresh your browser tab, ephemeral in-memory processing states are immediately cleared.

2. Local Storage and IndexedDB

We utilize client-side persistent browser storage mechanisms solely to enhance your local reading and user experience:

  • Reading History & Settings: Storing your current reading page, bookmark progress, font size, and color theme preferences via localStorage.
  • Offline Book Cache: Storing uploaded .EPUB or .TXT text in your browser's private IndexedDB storage so you can read seamlessly without re-uploading files.

None of this local data is ever transmitted to our servers or cross-referenced with your personal identity. You can permanently erase this data at any time through your browser's clear storage settings or via the in-app "Reset" controls.

3. Web Analytics & Performance Telemetry

To maintain reliability, evaluate technical performance, and understand how our visitors interact with our public guides and tools, we employ industry-standard web analytics:

Google Analytics

We use Google Analytics to measure aggregate visitor metrics, session durations, and general device characteristics. Google Analytics uses cookies to gather anonymous engagement data. IP anonymization is enforced to prevent identifying individual IP addresses. Visitors can opt out of Google Analytics measurement at any time using the official Google Analytics Opt-out Browser Add-on.

Cloudflare Web Analytics

We leverage Cloudflare Web Analytics to measure edge page delivery speeds, Core Web Vitals, and aggregate traffic volume. Cloudflare Web Analytics operates without cookies, does not collect personal identifiers, and does not track users across non-affiliated web properties.

4. Privacy-First Contextual Advertising

Flitten is supported by privacy-focused advertising partners to ensure our educational tools, calculators, and public domain library remain completely free and accessible to all users worldwide.

Our advertising partners adhere to strict privacy safeguards:

  • Contextual Relevance: Advertisements are served based on the subject matter of the page you are viewing rather than invasive personal behavioral profiles or cross-site tracking dossiers.
  • Zero Cross-Site Surveillance: Our ad delivery engines do not sell, rent, or cross-target your personal browsing history across external websites.
  • Brand-Safe Standards: All displayed ads comply with verified ethical standards and community suitability guidelines.

5. GDPR & CCPA Privacy Rights

Under the General Data Protection Regulation (GDPR), California Consumer Privacy Act (CCPA), and related international privacy legislation, you have rights concerning your personal data. Because we do not require account creation, do not store customer databases, and do not process personal files on remote infrastructure, we minimize user data collection to the highest degree feasible.

6. Updates to This Policy

We may update this Privacy Policy from time to time to reflect operational or legal updates. Any modifications will be posted directly to this page with an updated revision date.