Free is enough for most one-off jobs. Pro raises the file and batch caps; Pro + Media unlocks GB-scale streaming and unlimited duration.
Larger files supported on Developer (5 GB CSV) and Enterprise (unlimited). All processing happens in your browser — files never reach a server.
Drop your audio file
Pick a stretch factor (0.5x-2x) — pitch stays the same
Download the time-adjusted file
0 bytes uploaded. Time Stretcher runs entirely in your browser using FFmpeg.wasm 8.1, RNNoise, and the Web Audio API. Your audio stays on your device at all times. No data is sent to any server — critical for sensitive interviews and confidential calls.
Speed change shifts pitch (chipmunk effect at >1x). Time-stretch preserves the natural pitch — essential for re-timing speech without it sounding cartoonish.
Change audio pitch by semitones or cents while keeping the original duration intact. FFmpeg rubberband-style processing.
Open toolAdjust playback tempo by percentage. Like time-stretch but expressed as a tempo % — natural for musicians.
Open toolCut start/end timestamps from any audio file. JAD re-encodes once at the source quality — your file never leaves the browser.
Open tool