PDF privacy guide
How private PDF tools can work without uploading your files
A PDF tool can run entirely inside your browser instead of sending the document to a remote conversion server. This guide explains what that means, how to check it yourself, and where local processing has practical limits.
Local processing versus server processing
With server processing, your browser first sends the document across the network, a remote system performs the task, and the result is sent back. That model can support very large files and heavy conversions, but it requires the document contents to leave your device.
With local browser processing, JavaScript or WebAssembly code performs the operation on your computer or phone. The file can be read, transformed, and downloaded without intentionally sending its contents to the site's processing servers. Kukureku's current PDF tools use this local approach for supported workflows.
How to verify a no-upload workflow yourself
1. Open your browser's developer tools
In Chrome or Edge, open Developer Tools and select the Network panel before choosing a document.
2. Clear the request list, then run the PDF task
Choose the file and perform the operation. Normal requests for page assets or website analytics can still occur, so the useful question is whether the document itself is sent in a large upload request.
3. Look for a file-sized upload
A server converter normally needs to transmit the document contents. In a local workflow, the processing step should not require a request carrying the PDF, DOCX, or image data to a conversion endpoint.
Why local PDF processing can be useful
Less document exposure
The file content does not need to be transferred to a remote conversion service for supported tasks.
No upload wait
Processing can begin as soon as the browser reads the file instead of waiting for a large upload to finish.
Simple one-off work
You can complete common document tasks without creating an account or installing desktop software.
Clearer data boundary
The document workflow stays separate from ordinary website requests such as loading pages, fonts, and analytics.
The trade-offs are real
Local processing uses your own device's memory and CPU. That means browser tools can be less suitable for extremely large documents or tasks that require heavy cloud computing.
Kukureku currently uses a 25 MB file limit. PDF-to-Word works best with selectable text rather than scanned page images, and Word-to-PDF focuses on readable document structure instead of reproducing every advanced Microsoft Word feature.
A private processing model also does not remove your own responsibility to protect the device, browser profile, and downloaded output.
Try a private browser-based PDF workflow
Kukureku currently provides ten focused tools. Each tool page explains its supported format, practical limits, and local processing behavior.
Privacy is more than the document processor
Any website still makes ordinary network requests to load the page, and hosting or analytics systems can receive normal visit information. That is different from uploading the contents of a document for conversion. Kukureku describes that distinction in its privacy policy.
Read Kukureku's Privacy Policy