BatchCrunch

BatchCrunch とは？

Drop a folder of video or audio files and BatchCrunch compresses or converts all of them using your own machine. It's ffmpeg compiled to WebAssembly, running inside the tab — your files are never uploaded, so there's no size limit and no waiting on someone else's server. No account, no subscription. 3 files per batch free; one-time $19 unlocks unlimited batches.