Record a line or upload a clip, and the echo voice effect places it in a huge stone cavern: repeats every third of a second over a four-second reverb tail. Compare it with your original and download a WAV. Free, in your browser.
How it works
Three steps. Short phrases with gaps between them give the echoes room to ring.
Step 1
Press Record and speak or sing for up to 60 seconds, or upload an MP3, WAV, M4A or OGG file up to 20 MB and 5 minutes long. No need to leave silence at the end; the effect adds its own tail.
Step 2
Cave echo is preselected, so press Apply effect. Your browser builds the echoes and reverb on your own device in a few seconds, a little longer for long uploads.
Step 3
Flip between Original and Cave echo while it plays. The download, cave-voice.wav, runs a few seconds longer than your clip so the echoes fade out naturally instead of being cut off.
Scripts to try
Short calls with pauses let each echo be heard. Leave a beat after every phrase.
Hello... is anyone out there?
Wait a full second after the question. The echoes answer for you.
We've found the entrance. It goes deeper than the map shows. Keep the ropes tight.
Welcome... to the arena.
Ladies and gentlemen... the champion of the world!
Breathe in slowly. Hold it. And let it go.
Spoken softly, the long reverb turns this into a meditation cue.
Highlights
Real caves give you both: distinct repeats from far walls and a dense wash from everywhere else.
Your voice repeats every 320 milliseconds, about the time sound needs to reach a rock wall 180 feet (55 m) away and bounce back. Each repeat returns at 38% of the one before and a little darker, so the echoes fade over about two seconds.
Underneath the echoes, a 4-second reverb simulates thousands of reflections off stone. It starts 40 ms after your voice, which adds a sense of size, and grows darker as it fades, the way rock and air soak up high frequencies.
Your dry voice stays up front at 85% while the reverb blooms behind it, and a low cut at 90 Hz keeps the space from turning boomy. You get a huge room without losing the words.
Quick reference
People use the two words interchangeably, but they are different sounds. This effect uses both.
| Feature | Echo | Reverb |
|---|---|---|
| What you hear | Separate, distinct repeats | A smooth wash of sound |
| Where it happens | Canyons, cliffs, stadiums | Halls, churches, tiled rooms |
| Reflection timing | Roughly 50 ms or more apart | A few ms apart, blurred |
| In this effect | 320 ms delay, 38% feedback | 4 s tail, 40 ms pre-delay |
| Best for | Calls, shouts, reveals | Atmosphere, size, dreaminess |
The ear starts hearing a reflection as a separate echo when it arrives roughly 50 ms or more after the original sound. Earlier reflections fuse into reverb.
A real cave does three things to your voice. Hard rock reflects almost everything, so sound keeps bouncing for seconds. Distant walls send back distinct copies you can count. And with every bounce, the rock and the air absorb a little more of the high end, so the tail gets duller as it fades. The effect copies all three.
The echo is a feedback delay: your voice goes into a 320 ms delay line, and 38% of what comes out is fed back in through a filter that cuts above 2.8 kHz. That's why each repeat is quieter and darker than the last. The reverb comes from convolution with a generated impulse response, a 4-second burst of decaying noise that darkens over time and stands in for the cave's countless reflections.
Why 320 ms? It is long enough that every repeat is clearly separate from your words, yet short enough that a sentence still hangs together. Much longer and the echoes start to sound like a second speaker; much shorter and they blur into the reverb.
Leave gaps. Echoes overlap continuous speech and smear it. Say a phrase, wait about a second, then say the next. Calls, names and single words work best; a long monologue turns muddy.
Record dry. If your room already echoes, you get two spaces stacked on top of each other. Record in a carpeted or furnished room, about 6 inches (15 cm) from the mic, with no background music. Singers should hold notes steadily, because the reverb tail rewards long phrases.
Use it where space matters. Short videos, dungeon and cave scenes in games, dream sequences in podcasts and calm meditation cues all benefit. Apply the effect here, download the WAV and import it into your editor. If it's too wet for your mix, layer it with your original recording and turn the echo track down.
Need the voice itself? The narrator voice generator creates a calm storyteller voice from text with AI; it needs a free account and uses credits. This echo effect works on any audio you upload, including clips made elsewhere. For a distant transmission rather than a big space, the radio voice effect does the opposite and strips the room away.
Last updated October 21, 2026
Use cases
Anyone who wants a voice to feel bigger than the room it was recorded in.
Dramatic reveals, mountaintop shouts and echoing punchlines for TikTok, Reels and Shorts.
A huge, spacious vocal for demos, intros and atmospheric hooks.
Cave, temple and dungeon dialogue that sounds as big as the map.
Slow, spacious breathing cues and calm intros for relaxation audio.
FAQ
Quick answers about the cave echo, file length and privacy.
Still have a question?
The quickest way to find out is to try it yourself. It only takes a minute.
Record a line, apply the cave echo and download it in about a minute. Free, no sign-up, nothing uploaded.
