Questions, answered

The short version: it is genuinely private, genuinely free, and needs no account.

Is it really private?

Yes. Every conversion runs in your browser with WebAssembly, so your files are never uploaded to a server. You can turn off your network after the page loads and the tools still work.

Is it free?

Yes. The in-browser tools are free with no daily caps, no watermarks, and no paywall. Some pages may show ads to keep it that way.

Do I need an account?

No. There is no sign-up and no login. Drop a file, convert it, download the result.

What file types are supported?

Images (PNG, JPG, WEBP, HEIC, SVG, ICO), documents (PDF, EPUB, CSV, JSON), video (MP4, WEBM, GIF), and audio (MP3, WAV, M4A), across roughly 46 tools for converting, compressing, and editing.

Is there a file size limit?

Because everything runs locally, the practical limit is your device's memory rather than a server quota. Large video files are the most demanding; most images, PDFs, and audio are quick.

How does it work without uploading?

The conversion engines are compiled to WebAssembly and run inside the page. When you pick a file, the browser reads it into memory, processes it on your device, and hands back the converted file for download.

Is the source code available?

Yes, for the reusable parts. The conversion engine is dual-licensed under the GNU AGPL-3.0 or a separate commercial license — under the AGPL you can read, study, modify, and fork it freely, and the on-device claim is auditable rather than just trusted. The porto.tools website itself is private and not open source: it is proprietary, all rights reserved.