How the cut is calculated
The start is rounded down to a sample boundary and the end up to the next sample. If the end exceeds the source duration, the result stops at the actual end of the recording; the output summary shows the effective interval.
Size and codec limits
The input must be at most 50 MB and 30 minutes, mono or stereo at 8–96 kHz. The exported WAV is limited to 64 MiB, regardless of how small the compressed input is. Invalid ranges, inconsistent channel lengths or invalid samples are rejected instead of silently altered.
What is actually verified
The RIFF/WAVE header and PCM payload length are re-read after encoding. Playback is not independently tested. MP3, AAC/M4A, OGG, FLAC and WAV sources work only if your browser supports the codec.