Check where a PDF merger processes files before using a work computer
Check your organization’s rules before opening work documents in an external web tool. A browser-local processing statement is not permission to use the tool at work. Start with fictional PDFs that contain no confidential information.
What happens to a PDF in Rakuruno
PDF Merge & Split reads selected files into browser memory and uses the bundled pdf-lib library to copy pages into a new PDF. It has no file-upload form or file-submission step. The result is downloaded to your device. Loading the website’s HTML and JavaScript, and Google Analytics traffic on the production site, are separate activities. No file upload does not mean no network traffic.
Try a one-page cover and a two-page body
- Create non-confidential sample PDFs: a one-page cover and a two-page body.
- In the merge tab, add the cover first and the body second. Check the displayed names and page counts.
- Merge, save and open the result in a PDF viewer. It should have three pages, with the cover first.
You can reorder the list after adding files. If you change the order, merge again and save the newly generated result.
Observe traffic while you perform the task
Open your browser’s developer tools and its Network panel. Once the page has finished loading, clear the recorded requests. Add the fictional files, merge and download them. Inspect any new requests for file submission. If analytics requests appear, examine the destination and payload separately from the file-processing steps.
This observation is evidence for that session, not a guarantee about browser extensions, device-management software or future changes to the site. Network logs can themselves contain information; do not send raw logs outside your organization without checking them.
Documents that need extra care
Encrypted or damaged PDFs may fail to load. Digital signatures, forms, bookmarks and other document features are not guaranteed to survive page copying. Use an organization-approved workflow for signed originals or forms required by a business system. The limits are 50MB per file, 20 files and 150MB total for merging. A device can still run out of memory below those limits.
Keep the originals and check page count, order, text and any interactive fields in the saved result. Ask your internal administrator if the intended use is not clearly permitted.