Repeats and space
Free Online Echo Tool
Create echo repeats for voiceovers, music phrases, transitions, and creative sound design. Control both delay and decay, preview the result, and export locally with FFmpeg in the browser.
Useful for private draft vocals, scratch voiceovers, and unreleased sound effects because the source file stays local.
Uses FFmpeg aecho filtering with explicit delay and decay controls for predictable repeat timing.
A fast way to audition slapback, longer repeats, and atmospheric echoes without opening a larger editor.
Drag & drop audio here, or click to upload
Supports MP3, WAV, M4A, FLAC, OGG, AAC, and more
How to use the Echo Tool online
- 1.Upload an audio file and let the browser read its duration and sample rate.
- 2.Set the echo delay and decay to control how far apart and how strong the repeats sound.
- 3.Choose MP3 or WAV export, process the file in the browser, preview the result, and download it.
Why use this Echo Tool?
Good for depth and transitions
A simple echo can add space to spoken lines, make transitions feel larger, or build stylized sound design quickly.
Private browser workflow
FFmpeg runs locally on your device, so source files stay off external servers during processing.
Flexible output
Export MP3 for quick sharing or WAV if you want to keep editing the result afterward.
Common use cases
- •Create a short slapback echo for spoken lines or lead vocals.
- •Add a more spacious tail to sound effects and transition hits.
- •Make music phrases feel wider in rough demo exports.
- •Build quick echo variations for podcast intros and trailers.
Tips for better results
- •For slapback-style results, start around 80 ms to 160 ms with moderate decay.
- •Speech usually stays clearer when decay is kept below about 0.45.
- •If you need more layering after the echo, export WAV instead of MP3.
Echo Tool FAQ
Can I make a slapback echo with this page?
Yes. Use a shorter delay and a moderate decay value for tight slapback-style repeats.
Is my audio uploaded to a server?
No. The processing happens in your browser, so the source file stays on your device.
Which formats can I upload?
Most common browser-decodable formats are supported, including MP3, WAV, M4A, FLAC, OGG, and many AAC-based files.
When should I export WAV instead of MP3?
Choose WAV if you plan to keep editing or chain more processing afterward. MP3 is better for quick sharing and review.