What this converter actually supports
Published audio routes run through the deployed FFmpeg toolchain. The converter probes the source stream before conversion, and files without a decodable audio stream cannot produce an audio result.
Use MP3 for sharing and legacy devices, WAV for editing, or FLAC only when preventing additional loss from later processing.
The public upload limit is 1 GB. Convertr does not reduce dimensions, duration, resolution, or output quality merely to manage worker load.