About Offline File Converter

Offline File Converter is an independent project built and maintained by NeuralWork. It exists because converting a file shouldn't require handing that file to a stranger's server.

Why this exists

Most online converters work the same way: you upload your file, their server converts it, and you download the result. That means your document, photo, or video sits on someone else's machine — often with vague retention policies, and sometimes behind email walls or paywalls. For personal documents, contracts, ID scans, or family photos, that trade-off is unnecessary.

Modern browsers can do the conversion themselves. Using WebAssembly, the same open-source engines that power desktop software (like FFmpeg for video and PDF.js for documents) run directly on your device. Your file is opened, converted, and saved locally — it never crosses the network. Here's exactly how that works, including how to verify it yourself.

Principles

• Files never leave your device. Every tool on this site processes files locally in your browser.
• Free, no accounts, no email walls. Open the page, convert, done.
• Honest about limits. Browser-based conversion has real constraints (very large files depend on your device's memory). We say so rather than pretend otherwise.
• Built on open source. The conversion engines are established open-source projects, credited on the How it works page.

Get in touch

Found a bug, or want a tool that doesn't exist yet? Email neuralwork.net@gmail.com or use the contact page. Most of the tools on this site started as a user request.