Audio / Effects
Slowed + Reverb Generator
Make a slowed and reverb version of any song in your browser: slow it down, add a dreamy reverb, preview it, and download the result as MP3 or WAV.
Slowed + Reverb Generator: The track is played more slowly, which also lowers its pitch, as when a record is slowed, and then sent through a large algorithmic reverb that blends with the original. A little bass is added to keep it full. The preview and the download use the same processing. Runs 100% locally in your browser with zero server file uploads.
- Category
- Video tools
- Runs
- In your browser
- Cost
- Free · no sign-up
- Availability
- Ready to use
Runs entirely in your browser
MP3, WAV, M4A, OGG, or FLAC · up to 20 minutes, nothing uploaded
Your file is processed in your browser and never uploaded. Changing the speed changes the pitch too, as in slowed and sped-up edits. MP3 files are encoded with LAME, free software under the LGPL, loaded as a separate file; its source is at lame.sourceforge.io. Only edit music you have the right to use.
A starting point for slowed + reverb
Try 0.8–0.9× speed, shown as 80–90% in the control. The Slowed + reverb preset starts at 85% speed, 35% reverb amount and a 3.5-second room size. Preview a section with vocals, then reduce the amount or room size if words become blurred.
Speed and pitch move together. At 0.85× a three-minute song lasts about 3 minutes 32 seconds before the reverb tail. The tool does not offer pitch-preserving time stretching.
Controls and export
Amount blends reverberation with the original sound. Room size sets the decay length in seconds; a longer value leaves notes ringing for longer. Speed changes duration and pitch together. These controls affect both the preview and the download.
Download MP3 for a smaller file or WAV for uncompressed audio. A WAV export does not restore detail lost in the source. Keep a copy of the original track so you can try different settings without applying effects to an already processed version.
How to use it
- Choose a song from your device.
- Adjust the speed, usually 80 to 90%, and the reverb amount and room size while the preview plays.
- Download your slowed + reverb version as MP3 or WAV.
Privacy & limitations
The song never leaves your device; everything is processed in your browser.
Related tools
Frequently asked questions
What settings should I start with for slowed + reverb?
Try 0.8–0.9× speed (80–90%), then adjust by ear. The Slowed + reverb preset starts at 85% speed, 35% reverb amount and a 3.5-second room size. Lower the amount or room size if vocals become hard to follow.
What does each control do?
Speed and pitch changes tempo and pitch together: slower means longer and lower, with no pitch-preservation switch. Amount blends the reverb with the original sound. Room size sets how long the reverb decays, in seconds. Preview a section with vocals and adjust the balance until the words stay clear.
What format can I download?
MP3 for a smaller file, or WAV for uncompressed audio. Both use your chosen effects. Exporting WAV does not recover detail lost in an MP3 source.
Free tool · runs in your browser · no account required