Free Slowed Reverb Generator
A completely free slowed and reverb tool with no signup, no credit card, and no hidden charges. Just upload, tweak, and export — your files stay on your device.
Your audio never leaves your device. All processing happens locally in your browser.
Drop your audio file here
or click to browse — MP3, WAV, M4A, OGG, FLAC up to 50MB
Not every slowed reverb generator out there is actually free. Many tools bait you with a free trial, then lock essential features — like export, or quality above 96kbps — behind a paywall the moment you try to save your track. That is frustrating, and it is not how we operate. Our free tier is genuinely free: upload any supported audio file, tweak speed and reverb in real-time with instant preview, and export a full 128kbps MP3 without ever creating an account or handing over a credit card number.
Why do we offer this for free? Because the browser can do the heavy lifting. Every bit of audio processing — the playback rate shift, the convolution reverb, the tone shaping, the bass boost — runs on your device via the Web Audio API. We do not run a render farm of servers burning GPU hours per track. There is no per-user infrastructure cost to recoup, so passing the savings on to free users is easy. The Pro tier exists for people who need lossless WAV, 320kbps MP3, and watermarks removed — professionals and serious creators — and that subscription covers our development costs.
The free experience is intentionally complete. You get the same four preset starting points (Slowed + Reverb, Nightcore, Lofi, Dreamy), the same five-parameter control panel (speed, reverb wetness, room size, tone muffle, and bass boost), and the same real-time preview that updates as you drag the sliders. The only limitations are the export bitrate and a subtle beep watermark every 20 seconds on tracks longer than three minutes — gentle enough not to ruin the listening experience, but present enough that anyone serious about quality will see the value in Pro.
Privacy is another thing we do not compromise on for free users. Your audio files never leave your device. Not to our server, not to a CDN, not to a third-party analytics service. The upload step reads the file into an ArrayBuffer in memory, decodeAudioData turns it into an AudioBuffer, and from that point forward everything happens inside the browser's audio graph. We could not access your files even if we wanted to — and we do not want to.
If you have been hunting for a free slowed reverb generator that does not hold your export hostage or demand an email address, you have found it. Pick a song from your library, drag it in, and start shaping that dreamy, slowed-down sound right now.
Frequently asked questions
- Is there really no catch to the free version?
- No catch. You can use every feature of the tool — full parameter control, real-time preview, and MP3 export at 128kbps — without signing up or paying anything. The free export includes a subtle beep every 20 seconds on tracks over 3 minutes and is limited to 128kbps MP3. If you need lossless WAV, 320kbps MP3, or watermark-free exports, the Pro plan is $6/month.
- Why do other tools charge but this one is free?
- Most competitors run audio processing on cloud servers, which costs them money per track rendered. Our tool does everything in your browser using the Web Audio API — there are no server-side processing costs to pass on. We only charge the Pro tier for advanced export formats to support ongoing development.
- Will the free version always be free?
- Yes. The free tier is a permanent part of our product. We may add more Pro features over time, but the core tool — upload, tweak, preview, export at 128kbps — will remain free without signup.