Why we built ZenTools
Traditional online conversion tools require you to upload your files to a remote server. That is a privacy compromise — your data is transmitted, processed, and potentially stored by a third party.
ZenTools eliminates that entirely. Using WebAssembly ports of industry-standard libraries like FFmpeg, PDF.js, and jsPDF, we run complex media processing directly inside your browser tab. Close the tab and every byte is gone — instantly.
Zero server uploads
Every operation runs on your own CPU
No queues or limits
Processes as fast as your hardware allows
Instantly wiped
Close the tab — all data is gone
No account needed
No login, no credit card, no tracking
Built for anyone who values privacy
Local processing is not just a feature. It is a paradigm shift.
Privacy-conscious users
Anyone who does not want their personal files — health records as PDFs, private photos, confidential documents — processed on someone else's server.
Developers & designers
Professionals who need fast, no-signup utility tools to convert assets, compress videos for web, or batch-process images during a project.
Everyday users
People who just need to compress a video before sending it, convert an image to a different format, or extract audio from a clip — without installing software.
Everything included, all free
No paywalls, no feature tiers. Every tool is fully accessible.
Powered by open source
Your web browser is a powerful runtime environment. ZenTools uses WebAssembly compilations of battle-tested open-source libraries to run code directly on your CPU and RAM — with no network round-trip.
When you drop a file, it loads into the browser tab's sandbox memory. Once you hit Process, the WASM engine executes and your browser prompts a standard file download. Your file never crosses a network boundary.
FFmpeg.wasm
WebAssembly port of FFmpeg for all video and audio processing
PDF.js
Mozilla's client-side PDF renderer for PDF-to-image conversion
jsPDF
JavaScript PDF generation library for images-to-PDF
HTML5 Canvas API
Image format conversion and compression
Next.js 14
App Router, TypeScript, Tailwind CSS — deployed on Vercel
A ZenWebX product
ZenWebX is a studio focused on building privacy-first web tools and utilities. We believe the modern browser is powerful enough to run professional-grade tooling without ever requiring a server backend.