Speed up or slow down an audio file. Works instantly in your browser — no upload, no account needed.
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Choose Audio FileMP3, WAV, OGG, M4A · Max 30MB
Processing your audio...
This tool changes the playback speed of an audio file, which also affects its pitch — speeding up makes audio play faster and sound higher-pitched, while slowing down makes it play slower and sound lower-pitched. Choose a speed multiplier, preview the result, and download the adjusted audio.
Processing happens entirely in your browser using the Web Audio API — your audio is never uploaded to a server.
This tool changes speed by resampling the audio — effectively playing it back faster or slower, the same way an old tape or record sounds higher-pitched when sped up and lower-pitched when slowed down. This is the most straightforward and reliable way to change speed in a lightweight browser tool. Pitch-preserving time-stretching (changing speed without affecting pitch) requires significantly more complex audio processing and is not provided by this tool — if you need speed changes that preserve the original pitch, dedicated audio editing software with time-stretch algorithms would be needed.
A multiplier of 1.25x-1.5x noticeably speeds up speech while generally remaining understandable, useful for podcasts and lectures. Going beyond 2x often makes speech difficult to follow and significantly raises pitch. For slowing down, 0.75x-0.9x can help with careful listening (such as transcribing or learning a passage) without sounding too distorted, while going much slower makes pitch drop substantially and can sound unnatural.
How noticeable the pitch shift is depends a lot on what's being sped up or slowed down. For spoken word — podcasts, lectures, voice memos — a moderate speed increase (up to around 1.5x) shifts pitch only slightly, and most listeners adjust to it quickly since the priority is usually following the content rather than how natural the voice sounds. For music, pitch shifts are much more noticeable to most listeners, since music has clear pitch relationships (melodies, harmonies) that a trained or even casual ear can perceive as "off" once shifted — a song sped up by even 10-15% can sound noticeably different in key. If your goal is specifically to change a music track's tempo for practice (like slowing down a song to learn an instrumental part), be aware that the pitch shift means the notes you hear won't be in the original key — useful to know if you're trying to play along on an instrument tuned to standard pitch.
For long-form audio content — lectures, multi-hour podcasts, recorded meetings — even a modest speed increase adds up to meaningful time savings. A one-hour recording played at 1.25x finishes in 48 minutes; at 1.5x, it finishes in 40 minutes. For content consumed regularly (a daily podcast, weekly lecture recordings), this difference compounds significantly over time. Many people find that starting with a smaller increase (1.1x-1.25x) and gradually working up to faster speeds as they get used to it is more comfortable than jumping straight to a much faster speed, which can initially feel difficult to follow even if it becomes easier with practice.
If you need to trim the result afterwards, use Audio Trimmer. To convert the result to a different format, see Audio Converter.
Yes, this tool changes speed by resampling, which also raises pitch when speeding up and lowers it when slowing down — similar to how old tapes sound when played at the wrong speed.
This tool only offers combined speed/pitch changes via resampling. Independent pitch-shifting requires more complex time-stretching algorithms not provided here.
Typically from 0.5x (half speed) to 2x (double speed), covering most common use cases for speeding up or slowing down audio.
The adjusted audio is exported as a WAV file at the new speed and pitch.
No, processing happens entirely within your browser.