Your PDF Files Should Never Leave Your Laptop

Description and use

OnyxPDF lets users process PDFs entirely in the browser, eliminating uploads and protecting privacy.

Problem

Users often upload sensitive PDFs to free online tools, exposing them to unknown servers and potential data misuse.

Outcome

OnyxPDF enables secure, private PDF manipulation without uploading files, preserving user privacy and reducing reliance on external servers.

Workflow

• Open onyxailabs.github.io/onyxpdf
• Select a tool (e.g., merge, compress, encrypt)
• Upload file locally
• Process in browser using WebAssembly
• Download or use result
• Close tab – no data remains on server

Evidence

Your file uploads. Somewhere, a progress bar fills while your document travels to a server you've never heard of

Source

OnyxPDF — a set of 50 PDF and image tools that run 100% in your browser

Source

No upload. No account. No "create a free account to download your file."

Source

Load the site once, then switch your device to airplane mode and run a tool. Everything still works, because there's no server in the loop to disconnect from.

Source