How it works
Change playback duration and pitch together with a speed multiplier.
0.25–4× speed uses linear interpolation. Pitch changes; this is not pitch-preserving time stretch. Faster settings can alias.
Select local files; nothing is uploaded. Preview the result before downloading.
Example
Speed(×)=2× : 5s / 1kHz → 2.5s / 2kHz
Limits
PCM WAV input only:8/16/24/32-bit integer or32-bit float, mono/stereo,8000–96000Hz. Output:16-bit PCM WAV. MP3/M4A/OGG/FLAC are not supported in v1.
Memory is checked from duration, channels and sample rate before decoding. The working budget is64MiB mobile or128MiB desktop; source PCM≤32MiB, duration≤180s.
Speed changes pitch and uses linear interpolation.