Processing is performed in your browser with FFmpeg.wasm. Large media can use substantial memory.
Trim: load one audio or video file. Add one or more CUT ranges; everything outside the CUTs is kept and joined.
Join: choose two or more files of the same media kind. Audio files are normalized and joined. Video files are normalized to the selected canvas size/FPS and joined in selection order.
Combine: choose one video and one audio file. The added audio can replace the video's audio or be mixed with it. Offset can be adjusted in milliseconds.
Preview: uses WAV for audio and MP4 for video. Final export uses the selected format.
Output: audio supports WAV, MP3, M4A, FLAC and WebM/Opus; video supports MP4 and WebM.