Free tools for your next audio edit
Add reverb to audio. Hear the tail before you download.
Add a simple synthetic reverb to a short MP3 or WAV. Adjust decay and wet mix, compare the actual export, and download locally without an account. This effect can sound metallic and can change peaks.
Add reverb to audio
Free · localNo file selected. Audio stays in this browser.
Uses four feedback delay lines per channel, with no room modeling or cross-channel mixing. The tail is cut at the selected decay time and may remain audible. No normalization or source separation. Peaks can clip; keep your original.
Compare the actual result
How to add reverb to an MP3 or WAV
Choose a representative short recording and keep the original.
- 01 / OPEN
Choose an audio file
Select a mono or stereo MP3 or WAV up to five minutes and 50 MiB. Your browser decodes it locally at 48 kHz.
- 02 / ADJUST
Set decay and wet mix
Choose a decay from 0.3 to 3 seconds and a wet mix from 0 to 100%. A higher mix makes the synthetic effect more prominent. At zero, the output is dry.
- 03 / LISTEN
Preview and download
Prepare a WAV or MP3 and compare it with the original. The download is the same file as the result player. Each new pass starts from the original.
A simple synthetic effect
What this reverb does
Four feedback delay lines are averaged for the wet signal, with separate state for each channel. The decay control sets approximate feedback decay; it is not a measured room response or a guarantee of acoustic RT60. This basic effect may sound metallic or echo-like. It does not widen stereo, model a room, remove reverb or isolate a source.
A wet mix above zero adds a tail equal to the chosen decay time. The tail is cut at that point and can still be audible; listen to the ending. The original decoded frames remain at the beginning, but the effect changes their waveform and level. MP3 adds a lossy encode and may introduce delay or padding.
WAV is 48 kHz, 16-bit PCM. The output including the tail must fit 50 MiB. Peaks can exceed full scale; the tool reports samples clipped during PCM preparation. This count is not a true-peak or decoded MP3 peak measurement. Lower the source level before retrying if necessary.
For an explanation of reverb, decay and dry/wet settings, read what reverb means. If your problem is unwanted room reflection, adding this effect will not repair it.
MP3 encoder credits
Built with the LAME encoder via lamejs.
The optional MP3 download uses lamejs 1.2.1 by Alex Zhukov, a JavaScript port of the LAME MP3 encoder. Its unmodified script is served separately. See the attribution and source notes, upstream license notice, LGPL-3.0 and GPL-3.0 texts, and complete upstream source package.
A few useful answers
Free audio reverb questions
How do I add reverb to audio online?
Choose a supported mono or stereo MP3/WAV up to five minutes and 50 MiB. Set decay and wet mix, choose WAV or MP3, then prepare and compare the result. The preview and download use the same file.
What type of reverb is this?
A simple synthetic effect using four feedback delay lines independently per channel. It is not a captured room or a convolution reverb and may sound metallic. Listen to the result before using it.
Does the effect add time to the file?
At a wet mix above zero, it adds a tail equal to the selected decay time. That tail is cut at its end and may still be audible. At zero wet mix, no tail is added. MP3 encoding can add delay or padding.
Is my file uploaded?
No. Decoding and processing happen locally in the browser without an account. Download the result before leaving and retain the original.
What if the result clips?
The tool reports out-of-range samples during PCM preparation. Lower the source level and try again; the count is not a true-peak or decoded-MP3 peak measurement. Reverb can change peaks even without normalizing.
Can this remove reverb or isolate a voice?
No. It adds a synthetic effect to the whole recording. It does not remove room reflections, separate sources, normalize or repair clipping.
What formats and limits apply?
The tool decodes compatible mono or stereo MP3/WAV locally at 48 kHz. WAV is 16-bit PCM; MP3 is a new lossy encode at 128, 192 or 320 kbps. The output, including its tail, must fit 50 MiB. Tags and artwork are not preserved.
After preparing your audio