What is a slowed + reverb song?
Slowed + reverb versions went viral on YouTube, TikTok and Spotify: the song plays slower, a little lower and wrapped in a wide echo that gives it a dreamy, melancholic feel. It’s a hugely popular style for lo-fi music, edits and mood videos.
The tool does both steps at once. First it slows the audio down like a record spinning slower, so the pitch drops along with the speed, which is what gives the genre its signature character. Then it adds a synthetic reverb with a natural-sounding tail, with the highs slightly softened as in a real room.
Speed ranges from 0.60× to 0.98×; the most recognizable sound sits between 0.80× and 0.88×. The reverb amount controls how much echo is mixed with the original, and the room size sets how long the tail is: a small room gives an intimate effect, a large one sounds like a cathedral. A few seconds are added at the end of the file so the echo fades out naturally instead of being cut off.
Everything is processed in your browser. The free trial lets you create one version; with ToolStudio Pro you get unlimited use and can process several songs at once.
How to make a slowed + reverb song
- Upload the song.
- Choose the speed (0.85× is a good starting point).
- Adjust the reverb amount and room size.
- Click “Make slowed + reverb” and listen.
- Download it as MP3 or WAV.
What to use slowed + reverb for
- Create edits for TikTok, Reels or YouTube Shorts.
- Make lo-fi versions for studying or relaxing.
- Atmospheric background music for videos and streams.
- Experiment with songs you know to discover a new mood.
Supported formats
- Input: MP3, WAV, M4A, AAC, OGG, OPUS, FLAC, WEBM, AIFF and the audio from MP4 or MOV videos.
- Output: MP3 at 128, 192, 256 or 320 kbps, or 16-bit PCM WAV.
- Up to 250 MB per file. The sample rate and channels (mono or stereo) are preserved.
Frequently Asked Questions
Does the pitch drop when you slow it down?
Yes, on purpose: that’s the signature slowed sound. If you want to slow down without changing the pitch, use the speed changer with “Keep pitch” turned on.
What’s the most typical speed?
Between 0.80× and 0.88×. Below 0.75× voices start to sound very deep.
Is my audio uploaded to a server?
No. Your audio is read, processed and converted right in your browser using the Web Audio API. The file is never uploaded to a server and never leaves your device.
Is it free?
You get one free try per tool: one audio file. You can reprocess that same file with different settings as many times as you like, but to process a new file you need ToolStudio Pro, which gives you unlimited use of every tool, batch processing (several files at once, downloaded together in a ZIP) and no ads. You can cancel anytime.
