01
Add a file
Drop an audio file into the tool or choose one from your computer. Supported formats include MP3, WAV, FLAC, AAC, M4A, and OGG when your browser can decode them.
Speed Changer
Speed up or slow down an audio file without opening a DAW. Preview the rate, then export a new file — all in your browser.
Drop an audio file here
or click to choose from your computer
MP3 · WAV · FLAC · AAC · M4A · OGG
Speed
1×
One-click vibes
Reverb
Off
Original: 0:00
New duration: 0:00
0:000:00
Working…
Local processing in your browser · Files are not uploaded to our servers
What is the Speed Changer?
The Speed Changer adjusts how fast a track plays. Use it to fit a voiceover into a time slot, slow a phrase for practice, or create a simple sped-up version for social clips.
You pick a rate (for example 0.75×, 1×, or 1.5×), listen to the result, and download a rendered file. Processing is designed to stay on your device.
Pitch may shift with speed when using classic rate change — that is expected for this simple tool. For nightcore-style presets, see Nightcore Maker; for reverb + slow, see Slowed + Reverb.
Presets make common rates one click away: half speed, 0.75×, original, 1.25×, 1.5×, and double speed. One-click vibes jump straight to Slowed, Slowed + Reverb, Nightcore, or Sped Up so you can preview a style before fine-tuning the slider.
The waveform and duration readout update as you change the rate, so you can see the new length before you export. Everything runs locally in the browser — your audio is not uploaded to Sound Booster servers.
How it works
02
Set the speed
Choose a playback rate such as 0.75× for a slower version, 1× for the original rate, or 1.5× for a faster version. You can use presets or fine-tune the control and preview the result.
03
Export
Export the processed track as a WAV file. The new duration is calculated from the selected rate, so you can see how much shorter or longer the result will be before downloading.
Speed Changer tips
Speed changes are useful for more than music. Slow down speech or a difficult passage when you are learning, reviewing an interview, practicing an instrument, or checking a detail in a recording. Faster playback can help shorten long recordings or create energetic versions for short-form content.
Remember that classic speed changes affect both playback time and pitch. A slower rate normally makes the sound lower, while a faster rate normally makes it higher. If you need to change pitch without changing the overall duration, use the Pitch Shifter instead.
For natural results, start with a moderate rate change and listen before exporting. Extreme values can make voices and instruments sound noticeably different from the original.
Frequently asked questions
Will pitch change too?
Yes with basic speed change: faster playback sounds higher and slower playback sounds lower, which is the familiar tape effect. As a rough guide, 1.5× raises the pitch by about seven semitones, 2× by a full octave, and 0.75× lowers it by about five semitones. If you want to change pitch without changing speed, use the Pitch Shifter with Preserve tempo turned on.
Is this free?
Yes. No account is required to change speed in the browser. You can try different rates, preview each one, and download the result without a sign-up step, a watermark or a paywall. The only practical limit is how much audio your device can decode and process in the tab.
Do my files leave this device?
No. Core processing is designed to run locally in the browser. We do not upload your audio to Sound Booster for this tool, so the preview you hear and the file you download are both produced on your device. This is useful for private voice notes, lessons and unreleased tracks.
How much will the duration change at a given speed?
Divide the original length by the speed. A 4-minute song at 1.25× becomes 3 minutes 12 seconds, and at 0.75× it grows to 5 minutes 20 seconds. The tool shows the new duration before you export, so you can check that a voiceover fits its time slot or that a clip stays under a platform’s length limit.
What do the one-click vibes do?
They are quick presets for popular edits. Slowed + Reverb lowers the speed and adds a reverb tail, Nightcore speeds the track up with a brighter, higher sound, Slowed lowers speed without extra space, and Sped Up raises it. Reverb Off removes the reverb from a preset. Use them as a starting point and fine-tune the slider after previewing.
Which speed is best for practising an instrument or transcribing a song?
Many people start at 0.75× for a manageable pace and drop to 0.5× for fast passages, then work back up toward 1×. Keep in mind that this tool changes pitch with speed, so a slowed track will sound lower than the original. Lower speeds are good for hearing individual notes, while pitch-sensitive ear training may need the Pitch Shifter instead.
Can I speed up a podcast or lecture recording?
Yes. Moderate increases such as 1.25× or 1.5× usually stay easy to follow while saving time, and 2× is better reserved for material you already know. Because pitch rises with speed, voices will sound higher at the top of the range. Listen to a sample at the rate you pick before downloading the full file.
What format is the sped-up or slowed file saved in?
The processed track is exported as a WAV file, which keeps quality high but is larger than an MP3. If you need a smaller file for sharing, send the WAV to the Audio Converter and choose MP3 or another format. Keeping the WAV is useful if you plan to apply more edits afterwards.
Related tools
Keep editing with other browser-based tools on Sound Booster.