BatchCrunch

BatchCrunch processes folders of video, audio and image files entirely inside your browser tab. It is ffmpeg compiled to WebAssembly, running on your own CPU, so files are never uploaded to a server. There is no upload size cap and no queue. After the first load the encoder is cached, so it keeps working with the network switched off. Drop a whole folder and set one recipe per media type. Compress and convert video, audio and images; crop or change aspect ratio, resize, rotate, flip and add a text or image watermark; rename the output files. Every file shows an estimated output size before it runs and its real size and a side-by-side preview after. It is not a video editor: no timeline, no trimming, no subtitles. It does one job, in bulk. Free for 3 files per batch, no account. A one-time $19 licence removes the batch limit.