Speed up or slow down audio directly in your browser.
WAV · MP4 · M4A · FLAC · OGG · max 200 MB
A speed changer adjusts how quickly an audio recording plays. This is useful when studying a language, reviewing an interview, practising a musical passage or listening to a lengthy spoken explanation. Slower playback gives you more time to notice details, while faster playback can make familiar material quicker to review. The important question is whether you need a temporary listening aid or a downloadable recording that plays at the new speed in other applications.
Traditional resampling changes both playback speed and pitch. More advanced processing can attempt to change tempo while preserving the original pitch, but its accuracy depends on the algorithm and source material. Because different implementations behave differently, listen to the result before relying on pitch preservation. Speech may remain understandable after a noticeable speed change, while sustained musical notes, reverberation and percussion can reveal artifacts. An extreme setting will usually be less natural than a modest adjustment.
For interviews, lectures and podcasts, try small changes first. When slowing speech, pay attention to consonants, pauses and the natural rhythm of sentences. A slightly slower version can make unfamiliar accents easier to follow, but severe stretching may introduce robotic or watery sounds. When increasing speed, check whether important words remain intelligible. Fast playback is useful for reviewing familiar material; it is not always appropriate for a first listen to complex information or technical instructions.
Musicians often slow down difficult passages to hear note placement and timing. A short practice excerpt can be easier to analyse than an entire song. If the tool changes pitch as well as tempo, the recording may no longer match your instrument's tuning. If pitch preservation is available, compare a steady note and a percussive section before using the result for practice. Rhythmic material is particularly sensitive to unnatural transients, and repeated processing can make those problems more noticeable.
Keep the source file and choose a speed setting appropriate to the task. Process the audio, download the result and play it in another application. Check the opening, a busy middle passage and the ending for unexpected gaps or changes in sound. Remember that slowing down generally increases duration, while speeding up reduces it. Use a descriptive filename so you do not confuse the altered version with the original. If the sound becomes unnatural, return to the original recording and select a less extreme adjustment.