Turn any song into a dreamy slowed + reverb edit in seconds. Slow it down with the classic pitch drop, add a big reverb, warm up the bass, hear every change live, then download your version as MP3 or WAV.
Last updated:
Your song's waveform appears here
0:00 / 0:00
Presets
Choose a song or try the demo melody to start.
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How to use the Slowed and Reverb Generator
Choose a song: drop an MP3, WAV, M4A, OGG or FLAC file on the box, or press Play a demo melody.
Pick a preset such as Classic slowed + reverb, or set the speed, reverb, room size and bass yourself.
Press Play preview and adjust while listening; tick Hear original to compare.
Choose MP3 or WAV and press Create slowed + reverb.
Listen to the result and press Download.
Speed, pitch and length at a glance
Because slowing down lowers the pitch, every speed setting has a matching pitch drop of 12 × log2(speed) semitones, and the song becomes 1 ÷ speed times longer.
Speed
Pitch change
A 3:00 song becomes
Feel
0.95×
−0.9 semitones
3:09
Barely slowed, a little warmer
0.90×
−1.8 semitones
3:20
Subtle, still close to the original
0.85×
−2.8 semitones
3:32
The classic slowed + reverb sound
0.80×
−3.9 semitones
3:45
Dreamy, noticeably deeper voices
0.75×
−5.0 semitones
4:00
Heavy, slow-motion mood
0.70×
−6.2 semitones
4:17
Super slowed
0.50×
−12 semitones (one octave)
6:00
Extreme, everything an octave down
Tips for a great slowed + reverb edit
Start with a preset, then adjust one control at a time while the preview plays.
Reverb amount 30 to 50% keeps vocals understandable; above 60% the song turns into an ambient wash.
Longer rooms need less amount: a 6-second decay at 35% sounds as big as a 3-second decay at 55%, but smoother.
Add a little bass (+2 to +4 dB): slowing a song shifts energy downwards and reverb thins out the low end, so a gentle boost restores weight.
Use Muffle for the lo-fi, "playing in another room" effect. Combined with 0.8× speed it gives the popular underwater sound.
Export WAV if you will edit further in a video editor; MP3 192 kbps is plenty for sharing.
What happens to the audio
The song is resampled to the chosen speed (like a turntable), then passes a low-shelf bass filter at 120 Hz, an optional low-pass filter, and a stereo convolution reverb whose impulse response is generated from decorrelated noise with an exponential decay of the chosen length and a 20 ms pre-delay. A fast limiter at −2 dBFS catches the extra peaks from the boost and reverb, and the final file is checked so no sample exceeds −0.2 dBFS.
Frequently asked questions
What is slowed and reverb?
Slowed + reverb is a style of fan edit where a song is played back slower, which also lowers its pitch, and drenched in reverb so it sounds distant, dreamy and nostalgic. It became popular on YouTube, TikTok and SoundCloud around 2017 to 2020 and is closely related to vaporwave and chopped and screwed music.
What speed is best for slowed and reverb?
Most slowed + reverb edits use 0.8× to 0.9× speed. 0.85× is the classic setting: it lowers the pitch by about 2.8 semitones and makes a 3-minute song about 3:32 long. Go down to 0.7× or lower for a heavier, super slowed sound.
Why does the pitch drop when the song is slowed?
This tool slows the song like a record turntable running slower: every sound wave is stretched, so frequencies drop with the speed. The drop in semitones is 12 × log2(speed), for example 12 × log2(0.85) = −2.81. That deeper, warmer tone is part of the slowed + reverb sound. To change speed without changing pitch, use an audio speed changer instead.
How does the reverb work?
The tool generates an impulse response, a recording of how a virtual room echoes, made of decaying noise that darkens over time like a real hall, and convolves your song with it. Room size sets the decay time (RT60) and Reverb amount sets the mix of echo and original sound.
Will the export sound exactly like the preview?
Yes. The export runs the same effect chain (speed, bass, high cut, reverb and limiter) offline, faster than real time, so the file matches what you heard. The reverb tail at the end is kept, and faded out if you leave that option on.
Is my song uploaded anywhere?
No. The song is decoded and processed in your browser with the Web Audio API and encoded to MP3 with the LAME encoder in JavaScript, so it never leaves your device.
Can I post my slowed and reverb edit online?
The edit is still the original artist's recording, so copyright applies. Use it for personal listening, or follow the rules of the platform you post on and the rights holders' licensing.
Are all the tools on FreeToolCabin tested for quality and accuracy?
Yes! Every tool on our site undergoes automated Q/A testing in real browser environments to ensure high precision, correct output, and zero errors. If you happen to spot a bug or have a suggestion, please contact us at [email protected] and our team will review it right away.