Make a nightcore version of a song
Speed a song up and let the pitch rise with it, then save it as an MP3.
- Nothing is uploaded
- Works offline after first use
- Open source
- No watermark · limit is your device’s memory; phones hold less
Speeds a song up and raises its pitch with the speed, the sound known as nightcore, and saves it as an MP3. It is free, and your music is not uploaded: the song is changed in your browser tab. It makes that one change and adds no effects, and after your first run the page works offline.
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Nightcore is a song played faster, so that it also sounds higher, like a record spun too fast. This page does exactly that and nothing more: it plays the song faster and lets the pitch follow the speed, then saves the result as an MP3. It adds no effect, no echo and no picture.
It starts at 1.25× speed. At that speed the pitch rises by almost four semitones, and a 3-minute-30-second song comes out at 2 minutes 48. Pick a different speed from 1.05× to 2× in the list: the higher the speed, the higher the pitch, and 2× is a whole octave up.
A worked example: you drop song.mp3 and leave the speed at 1.25×. The page writes song-faster.mp3, which plays in 80% of the time and about 3.9 semitones higher. The note on the result says “1.25× speed, pitch following”.
The pitch slider is still there. While the box is ticked, a shift in semitones is added on top of the rise from the speed, so 1.25× with the slider at +2 is about 5.9 semitones up. Untick “Let the pitch follow the speed” to speed up without raising the pitch.
How much higher does it go?
With the pitch following the speed, the rise is set by the speed alone: each doubling of the speed is one octave, 12 semitones.
- 1.1×: about 1.7 semitones higher.
- 1.2×: about 3.2 semitones.
- 1.25×: about 3.9 semitones (the starting speed).
- 1.3×: about 4.5 semitones.
- 1.5×: about 7.0 semitones.
- 2×: 12 semitones, one octave.
What this page does not do
- It adds no effects. There is no reverb, echo, bass boost or picture; only the speed and the pitch change.
- It takes sound files, not links and not video. For a video, save the sound first with Extract audio from video, then bring it here.
- It does not keep the key. To speed a song up and keep its key, tick the box off, or use Speed up audio.
- It works on a whole file. To make nightcore of one part, cut it first with Trim audio.
How it works
- Drop one or more songs (MP3, WAV, M4A, FLAC or OGG), or tap to pick them.
- Leave the speed at 1.25× or pick another. The tick-box keeps the pitch rising with the speed; the pitch slider adds a further shift if you want one.
- Press Make nightcore. Each file downloads when it is ready, as an MP3; several come as a zip.
In your browser, not on a server
Your browser’s own audio decoders read the file in the tab. The speed is changed with WSOLA (waveform-similarity overlap-add): the sound is cut into overlapping 43 ms windows, spread out or packed together, and each window is nudged to line up with the one before so there are no clicks. The pitch is then moved by resampling through a windowed-sinc filter, which also shortens or lengthens the sound, so the stretch is sized to leave exactly the speed you asked for. The result is written with the same encoders as the audio converter.
Compared with upload-based tools: Online pitch shifters upload the whole song or recording and many cap the length or the number of files on a free plan. Here the file never leaves your device, a whole album can go in one batch, and nothing is added to the sound.
Verify it yourself. Give the page a short while after your first run to save itself for offline use, then turn off Wi-Fi or switch to airplane mode and run the tool again. Or open your browser's developer tools (F12, or Cmd-Option-I on a Mac), pick the Network tab, and watch it while you convert. The panel above does the same count for you.
Questions
What is nightcore?
A version of a song that is played faster, so that it also sounds higher, like a record played at too high a speed. This page makes that change and nothing else.
How do I make a nightcore version of a song?
Drop the song file here and press Make nightcore. The page speeds it up to 1.25×, lets the pitch rise with the speed, and saves an MP3. Pick another speed in the list if you want it faster or slower.
What speed should I use?
The page starts at 1.25×. Raise it for a faster, higher result and lower it for a gentler one. At 1.5× the pitch is about seven semitones higher, which is a big change; listen before you share it.
Can I speed a song up without raising the pitch?
Yes. Untick “Let the pitch follow the speed” and the speed changes alone, so the song keeps its key. The Speed up audio page opens that way.
Can I make nightcore from a YouTube link?
No. The page works on files on your device and does not fetch anything from other sites. Use a song file you already have.
Does it add reverb, bass or any other effect?
No. The page changes the speed and the pitch of the sound and nothing else.
Is it OK to share the result?
That depends on who owns the song. Changing its speed does not change who owns it, so a nightcore copy of someone else’s song needs their permission to publish.
Is the file uploaded anywhere?
No. There is no server in this process. The page is a static file and the work is done by code running inside your browser tab. Give the page a short while after your first run to save itself for offline use; then you can turn off Wi-Fi and it still works.
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