Is this audio speed changer free?

Yes. Changing the speed and the pitch, the presets, the reverb, the live preview and every download are free, with no account.

How do I speed up audio?

Drop it in and choose a speed above 1×: 1.25×, 1.5× or any value up to 4×. “Keep the pitch” keeps it in the same key; “Pitch follows” makes it higher, like a record played faster.

How do I make a Nightcore version of a song?

In this Nightcore maker, drop the song in and click Nightcore: it sets 1.25× with the pitch rising about 3.9 semitones. Adjust the speed if you like, then make the file. Sped up (1.2×) and slowed + reverb (0.85×) are one click too.

What is slowed + reverb?

A song played at about 0.85× with its pitch falling, in a large reverb, for a slow, dreamy sound. Here the reverb is an algorithmic plate with decay, room size, mix, bass and brightness to adjust.

Can I set a target BPM?

Yes. The tempo is read when the file opens; type the BPM you want and the speed is set to reach it. If the reading is half or double what you count, choose the other reading first.

What speeds can I use?

Any speed from 0.1× to 4×. The slider covers 0.25× to 2×, with 0.5×, 0.75×, 1.25× and 1.5× one click away; type any other value.

Can I slow down audio for a language lesson?

Yes. Slow a native speaker down to 0.75× with the Speech setting, loop the phrase you are learning, then go back to full speed. The voice and its pitch stay the same.

Will speeding up speech make it sound strange?

The Speech setting is made for talking: it keeps the voice and its pitch natural at 1.5× or 0.75×. It is chosen for you when the file is mostly speech, and you can switch it yourself.

Can I change the speed of a video?

You can drop in a video and change the speed of its sound; the result is the sound on its own, as MP3 or WAV. To keep a video’s picture, change only its pitch in the pitch changer.

How long will the file be?

Exactly the original length divided by the speed, to the sample: a 3:00 song at 0.75× is 4:00.00. With slowed + reverb, the reverb’s tail adds a few seconds at the end. The new length shows before you make the file.

How long can a file be?

The live preview plays files up to about 25 minutes of stereo sound on a computer and about 12 minutes on a phone. Longer files are changed in full; download them to listen.

Your file stays in your browser: the audio speed changer reads, changes and writes it there, and the download comes from there.

Audio Speed Changer: Slow Down or Speed Up

Q: How do I slow down a song without changing the pitch?

Drop it in, choose “Keep the pitch” and a speed below 1×, such as 0.75×. The song plays slower in the same key. Press “Make the file” to download it.

no sign-up, nothing to install: Free
type any speed, or drag: 0.1× to 4×
or following the speed, like a record: Pitch kept
type a tempo, get the speed: Target BPM
sped up and slowed + reverb, one click: Nightcore
to the sample, at any speed: Exact length

How do I slow down a song without changing the pitch?

Open the audio speed changer in the studio, drop in the song, and choose a speed below 1×, such as 0.75×, with “Keep the pitch” selected. The song plays slower in the same key. Press Play to hear it as you set it, loop the part you are learning, then press Make the file and download MP3 or WAV.

Speed up audio or slow it down in three steps

On a phone or a computer, with any audio or video file your browser can play.

Drop in a song, a lesson or a video
MP3, WAV, FLAC, M4A, OGG or the sound of an MP4 or MOV. The tempo and key are read straight away.
Choose the speed
Drag or type it, pick a target BPM, or choose Nightcore or slowed + reverb. Keep the pitch, or let it follow.
Make the file and download
MP3 up to 320 kbps or 16- or 24-bit WAV, exactly as long as the new speed makes it (plus the reverb’s tail with slowed + reverb).

Slow down audio or speed it up, your way

For practice, for listening, for DJ sets and for edits: the speed, the pitch and the sound, each where you want it.

A striped wooden spinning top on a pale wooden table in daylight

Keep the pitch, or let it follow

“Keep the pitch” slows a song down or speeds it up in the same key, for practice and for speech. “Pitch follows” changes both together, like a record played faster or slower, with nothing added to the sound; the studio shows how many semitones it moves.

Slow down a song to learn it

Play a solo, a riff or a verse at 0.75× or 0.5× in its own key, pick the bars on the waveform and loop them. Change the speed while it loops until you can play it at full speed.

Set a target BPM

The audio speed changer reads the tempo the way the BPM finder does. Type the tempo you want and it works out the speed; if it counts the beat at half or double, pick the other reading first.

A Nightcore maker, sped up and slowed + reverb

Nightcore is 1.25× with the pitch rising, sped up 1.2×, and slowed + reverb 0.85× in a wide plate reverb. One click sets each; then adjust the speed or the reverb as you like.

A real reverb you can shape

The slowed + reverb sound comes from an algorithmic plate reverb, not an echo: set its decay, room size and mix, and add bass or take the brightness down for the warm, hazy sound.

Speed up a lecture and keep it clear

The Speech setting stretches talking in the time domain, so a lecture, a podcast or a language lesson at 1.5× or 0.75× keeps every word clear in the same voice. It is chosen for you when the file is speech.

Exactly the right length

A three-minute song at 0.75× is exactly four minutes, to the sample, and the audio speed changer keeps the pitch within a cent of where it was. The new length and tempo show before you make the file.

Audio speed changer samples: before and after

Each sound was changed by this speed changer from the site’s own AI songs and voices. Every card shows the settings and what the studio read, and opens in the studio with them.

Audio speed changer guide: slow down, speed up, Nightcore

Changing speed with and without changing pitch

Played faster, a record or a tape also plays higher: every frequency rises with the speed. 1.25× is almost four semitones up, 0.85× nearly three down. That is “Pitch follows”, and it is what Nightcore and slowed edits use: resampling only, so nothing is added to the sound.

“Keep the pitch” changes the timing alone. Music is stretched by a phase vocoder that moves each frame’s partials in step, so chords stay whole, and lets drum hits through as they are, so they stay sharp. Speech is stretched in the time domain, joining pieces of the voice where they line up, so words stay natural.

How to slow down a song to learn it

Slowing a part down in its own key is the quickest way to learn a fast solo, a tricky rhythm or the words of a verse.

1Drop in the song and pick the bars you want on the waveform.
2Turn on the loop and set 0.75×, or 0.5× for a very fast part.
3Play along until it is comfortable, then raise the speed a little at a time while it loops.
4Make the file at your practice speed to take it with you.

Leave “Keep the pitch” on, so the part stays in the key you will play it in.

Nightcore maker: how to make a Nightcore version

A Nightcore version is a song played faster with its pitch rising, usually by 20 to 30 percent: brighter, quicker and higher. The Nightcore preset sets 1.25× with “Pitch follows”, which raises the pitch by about 3.9 semitones; sped up is a gentler 1.2×.

Slowed + reverb goes the other way: 0.85× with the pitch falling about 2.8 semitones, in a wide plate reverb with a little more bass and less brightness. Adjust the decay and mix until it sounds as hazy as you like.

Matching a track to a BPM

DJs and editors change a track’s speed to match a tempo: a 120 BPM track mixed into a 128 BPM set needs 128 ÷ 120 = 1.067×. Type the target and the speed is set for you, with the key kept unless you choose otherwise.

Tempo readings can come out at half or double what you count, especially on slow or busy tracks. Choose the reading that matches how you count the beat before setting a target.

Speeding up lectures, podcasts and lessons

Speech can usually go to 1.5× and stay easy to follow; 2× works for familiar material. Language learners often go the other way, to 0.75×, to catch every sound.

The Speech setting keeps a voice natural at both ends: it moves whole pieces of the voice, matched where they line up, instead of reworking the sound frame by frame.

How accurate the audio speed changer is

Every file comes out exactly as long as the speed makes it, to the sample (plus the reverb’s tail when reverb is on): three minutes at 0.75× is 4:00.00. With the pitch kept, test tones land within one cent of where they were at every speed tested, from 0.1× to 4×.

The preview plays through the same engine that writes the file, so what you hear is what you download.