Karps Refine
Get your song ready to post
Refine brings your song to Spotify and YouTube loudness, keeps the peaks under control, cleans up the bass and reduces hiss.
Free tool · no sign-up
Sped Up + Nightcore online
Make any song faster with a higher voice, nightcore style, right in your browser. Pick the file, adjust and download as MP3 or M4A. Your song never leaves your computer.
- No sign-up
- No watermark
- Processed in your browser
Quick version in your browser
Processed in your browser. Your song is not uploaded to any server.Hear the difference
Quick version × Studio version
The first minute of “Out Of My Control” by kolaa, in three versions. The quick version is made right now, in your browser, by this tool; the Studio version was made in Karps Music. In the Studio, you also choose the pitch of the song: a natural voice, higher like nightcore, or lower.
OriginalNo effects
Quick versionMade here, in your browser · faster with a higher voice, like nightcore
StudioMade in the Studio · pick a natural voice, nightcore or with reverb
Karps Music Studio
Get access to all our effects
34 effects in 12 categories, to combine on the same song and tweak whenever you want.
Speed
- Slowed
- Ultra Slowed
- Sped Up
- Ultra Sped Up
Space
- Echo
- Reverb12 types
Pitch
- Lower
- Ultra Lower
- Higher
- Ultra Higher
Movement
- 8D
- Chorus
- Tremolo
Tone
- Bass Boost
- Lo-fi
- Radio
Phonk & Funk
- Phonk3 types
- Funk3 types
Digital
- Robot
- Bitcrusher
Ambient sounds
- Rain
- Thunder
- Forest
- Ocean
Scenes
- Another Room
- Headphones
- Car
- Bathroom
FadePro
- Fade In
- Fade Out
TransformPro
- Reverse
- Stutter
SweepPro
- Low-pass Sweep
- High-pass Sweep
Also in Karps
More than effects
Karps Radar
Find the trending songs before everyone else
Follow your artists' new releases and the most played songs in 20+ countries. Found the one? It opens in the Studio in one click.
Learn more
All guides
How to Make Nightcore and Sped Up Songs in Your Browser
Make a nightcore edit in your browser: compare 1.15×, 1.25× and 1.35× speed, adjust reverb, check the vocals and download a free MP3 without signing up.
Nightcore vs Sped Up: What Is the Difference?
Hear nightcore and natural-pitch sped-up examples, learn how speed and pitch differ, and make a higher-voice browser edit with practical settings.
Questions
Frequently asked questions
What's the difference between sped up and nightcore?
Both make the song faster. In nightcore the voice also gets higher; in sped up the speed can change without touching the pitch of the voice. This tool makes the nightcore version, and in the Karps Music Studio you choose between the two.
Can I try it before creating an account?
Yes. Choose a song, adjust the speed, and download the result right in your browser, without signing up. When you want to go further, create a Karps Music account to work in the Studio and save your projects.
What can I do differently in the Studio?
The Studio gives you more control over your version: speed the song up while keeping the voice natural, set the pitch apart from the speed, and combine it with reverb from real spaces, 8D or echo. Save the project and return later to fine-tune it instead of starting over. You can hear examples in the “Hear the difference” section on this page.
Why create a Karps Music account?
To keep your music projects in one place, combine effects in the Studio, revisit your edits and download your versions as MP3 or M4A. You can also explore Radar to discover music and preview audio improvements with Refine. Sign up with Google or email and start with your own song.
Make the full version in the Studio
Natural voice or nightcore, reverb from real spaces and 25+ effects to combine. Start for free.
Create free account