What is sent to the server
Your selected Notebook and export settings are uploaded to Cloudflare Workers and passed to a private Cloudflare Browser Run session. Conversion happens on the server, not entirely in your browser. The service reads saved cells and outputs and uses Chromium to produce a PDF. Python code inside your file is never executed.
Temporary processing and cleanup
The application holds the upload and PDF in request memory and closes its browser session after success, failure, cancellation or timeout. We do not put uploaded Notebooks, generated PDFs or their text in a database, object store or application cache. Browser sessions are not shared between users.
Cloudflare operates the rendering infrastructure and may use temporary browser storage. Closing a session does not guarantee secure erasure of provider storage or process memory. Provider handling is governed by Cloudflare’s privacy policy.
The PDF in your browser
The generated PDF is sent back to your browser. One in-memory file powers the preview and download. It is replaced when you regenerate or choose another file, and released when you leave the page. A PDF you download stays on your device until you delete it. This version does not use local storage or cookies to retain your Notebook.
Scripts and outside resources
Uploaded JavaScript is disabled and active HTML is rejected. Rendering cannot fetch external images, scripts, fonts or styles from Notebook content. Supported embedded PNG/JPEG images and common math are rendered offline.
Logs and infrastructure
The conversion service does not log file bodies, file names or parser details. The frontend framework and hosting or network providers may keep operational information such as request time, route, status, IP address and user agent. Actual infrastructure log retention depends on the deployment operator. Do not configure request-body logging or content backups.
Files you choose to upload
Only upload content you are allowed to process. For confidential or sensitive data, review the deployment operator and infrastructure before using the service, or run this project locally.
Last updated: October 4, 2026.