Convert OGG to FLAC Online

"Online converter" normally means uploading your file to someone's server, waiting in a queue, and downloading the result. This page inverts that: it loads FFmpeg compiled to WebAssembly into your browser and does the work on your own machine. You keep the convenience of online — nothing to install, works on any OS — without the upload.

Yes, it gets larger — around 4× — since you're unpacking the audio rather than compressing it. Keep the OGG for storage and use the FLAC as the working copy. That matters here, because transfer is where server-based converters spend most of their time. With no upload and no download of the result, what's left is just the conversion itself: usually a second or two.

OGG files typically come from game assets, Linux software, Audacity exports, and royalty-free sound libraries — and OGG plays in browsers and game engines but is refused by iPhones, most car stereos, and plenty of upload forms. This freezes the existing loss rather than undoing it. Decode once to FLAC and every edit and export afterwards works on raw samples, adding nothing.

Because it's a web page rather than software, the same converter runs on Windows, macOS, Linux, ChromeOS, iPhone, and Android — with nothing to keep updated and none of the bundled adware that comes with downloadable free converters.

The OGG on your drive almost certainly started life in game assets, and OGG plays in browsers and game engines but is refused by iPhones, most car stereos, and plenty of upload forms. FLAC is the destination when you need uncompressed, edit-ready audio that every DAW and editor accepts. Yes, it gets larger — around 4× — since you're unpacking the audio rather than compressing it. Keep the OGG for storage and use the FLAC as the working copy. One honest note on this exact pair: OGG is already lossy, so moving to FLAC cannot restore detail the OGG encoder discarded — it hands you an uncompressed container, not better audio, and the value is a loss-free chain from here on.