Convert, compress, trim, and repackage audio and video entirely in your browser — MP3, WAV, FLAC, M4A, OGG, Opus on the audio side; MP4, WebM, MOV, MKV, AVI on the video side. Everything runs on your own device through WebCodecs and the mediabunny engine (plus a local lamejs MP3 encoder), so voice notes, lecture recordings, home videos, and work-in-progress clips never leave your machine. Drop a WhatsApp .opus voice note and get an MP3 that email clients accept; pull the audio track out of a screen recording; shrink an oversized clip under Discord or WhatsApp's size cap by back-solving the bitrate from your target megabytes; strip a video's audio for a silent loop; or turn a clip into an animated GIF. Batch mode converts a whole folder at once and downloads the results as a ZIP. The only hard limit is your device's memory, which handles most files under 500MB; because nothing uploads there is no queue, no rate limit, and no chance a private recording lands on someone else's server. Format coverage matches what your browser can decode and encode — the common modern set, not legacy proprietary codecs like WMA, WMV, or FLV.