Slowed + Reverb & Sped-Up Audio Maker

Make a slower or faster version of your own audio

A slower version can make a short music clip feel more spacious, while a sped-up version can create a brighter, quicker sound. This browser tool offers Slowed + Reverb, Sped-Up / Nightcore, and custom settings in one place. Choose an audio file, set the speed and reverb amount, render it, and listen to the preview before downloading a WAV copy.

The tool works with a local file you select. It does not download songs from streaming services, remove copyright restrictions, or guarantee permission to publish a remix. Use recordings you own or audio you are allowed to modify. A change in speed or pitch is an editing effect, not a license to reuse someone else's recording on a public page or monetized video.

How to create and download a remix

Choose an audio file such as MP3, WAV, M4A, or OGG. Whether it opens depends on the codec support of your browser. The maximum input is 30 MB, 120 seconds, and two audio channels. For a longer recording, first create a short section with our MP3 Cutter or another suitable editor, then load that section here.

The Slowed + Reverb preset starts at 0.8 times the original speed with a 20-percent reverb mix. The Sped-Up / Nightcore preset starts at 1.25 times speed with no reverb. Custom lets you choose your own values within the controls' limits. Press Preview & export WAV, wait for rendering, and listen using the player. Download audio-remix.wav only after checking that the result fits your intended use.

What happens to speed, pitch, and duration?

This version changes playback speed and pitch together. At 0.8 times speed, the recording takes longer and voices or notes become lower. At 1.25 times speed, it becomes shorter and higher. It does not provide independent pitch shifting or tempo changes that preserve the original pitch. If you need a faster speech recording without a higher voice, use a dedicated time-stretching workflow instead.

For example, a 60-second source at 0.8 times speed lasts about 75 seconds before the reverb tail. At 1.25 times speed, it lasts about 48 seconds. Speed can be set from 0.5 to 1.5. Extremely slow or fast choices may make speech harder to understand. Compare a modest adjustment with the original rather than assuming that the strongest setting produces the most useful result.

Reverb is an effect, not background-noise removal

Reverb adds a decaying echo-like space around the sound. The mix control determines how much of the processed signal is blended with the dry recording. It ranges from zero to 60 percent. When reverb is enabled, the export includes an additional two seconds to allow the tail to decay. A dense recording may sound less clear with a large mix, particularly when words overlap.

This tool does not separate vocals from instruments, reconstruct missing frequencies, or remove background noise. If you have a voice recording with distracting noise, our existing Background Noise Remover addresses a different task. Start with the cleanest source you have. Reverb can add a creative texture, but it can also amplify the impression of an already muddy recording rather than solving its original problem.

WAV output and quality expectations

The output is a 44.1 kHz, 16-bit PCM WAV file. WAV is broadly usable in editors and preserves the rendered samples without another lossy MP3 encoding step. It is usually larger than a compressed input. Converting an MP3 to WAV does not restore information lost during the original compression; the output contains your processed version of the available source.

Before export, the tool checks the rendered peak and reduces the level if necessary to avoid samples exceeding its output ceiling. This is not professional loudness mastering, and it does not mean every source will sound equally loud. Keep your device's playback volume low while comparing versions. Check for distortion, overly strong effects, and unwanted silence before importing the file into a video project.

Processing, privacy, and phone performance

Audio is decoded and rendered by the tool in your browser. Your selected file is not sent to a remixing backend. Normal website resources such as advertisements and analytics can still load independently. The source remains unchanged, and the downloaded remix is a separate file. Refreshing or leaving the page discards the current preview, so save a version you want to keep before moving on.

Compressed audio can become much larger in memory after decoding. This is why a small MP3 may still be too long for this tool. On a phone, keep the page open while rendering and avoid switching away if the browser tends to suspend background tabs. A shorter input and moderate effects can make testing easier. This page does not claim that every supported-looking file will decode on every device.

Troubleshooting a failed or unexpected result

If decoding fails, try a genuine WAV or compatible MP3 export. Renaming an unsupported file with a different extension is not a conversion. If the recording exceeds two minutes or has more than two channels, prepare a shorter mono or stereo copy. If no player appears, read the status message and wait until the render button becomes available again before trying a different file.

A higher voice in the sped-up result is expected, as is a lower voice in the slowed result. A longer ending with reverb is also expected. If the effect is too strong, lower the mix or move speed closer to one. If the WAV is larger than expected, compare its duration and sample format with the original compressed recording. The purpose is a usable creative audio output, not a guaranteed smaller file.

Frequently asked questions

Can I download MP3 directly?

This version exports WAV. It does not pretend that a WAV file renamed to MP3 is an MP3. Use a compatible encoder if your next workflow specifically requires MP3.

Can speed change without changing pitch?

Not in this implementation. Playback speed and pitch change together. Independent tempo and pitch control requires a different processing method.

Why is the remix longer than the original?

Slowing playback increases duration. Enabling reverb also adds two seconds for the effect tail, so the export can be longer for both reasons.

Does it work with M4A on every phone?

No universal guarantee is possible. The browser must decode the codec inside the file. If it cannot, try a supported WAV or MP3 version.

Does this remove vocals or noise?

No. It changes speed and adds optional reverb. Vocal separation and noise removal are separate tasks with different processing requirements.

Can I post any remixed song online?

Editing does not grant reuse rights. Check permission for the recording and the destination platform. Your own recordings or appropriately licensed audio are suitable starting points.

Is this private enough to use with a local recording on mobile?

The audio-processing code uses your browser and does not send the recording to an audio backend. Ordinary website ads and analytics can still load separately. A modern phone browser with Web Audio support is needed; a shorter clip uses less memory. Downloaded WAV files remain on your device, so manage them carefully.

Slowed + Reverb & Sped-Up Audio Maker — WAV Export