Quick answer
To add a fade to audio online, open the file, select the part you want to keep (or the whole track), set the Fade in and Fade out sliders between 0 and 10 seconds, press Preview result to hear it, then export. Typical values are 1–2 s for fade in and 3–5 s for fade out.
How to use the Fade In / Out
- Open your trackLoad the song or clip you want to fade.
- Choose the regionKeep the whole track or select a shorter part.
- Set fade lengthsAdjust Fade in and Fade out (double-click a slider to reset).
- Preview & exportListen with Preview result, then export.
Recommended fade lengths
| Use | Fade in | Fade out |
|---|---|---|
| Ringtone | 0.5–1 s | 1–2 s |
| Podcast intro music | 1–2 s | 3–5 s |
| Video background music | 2–3 s | 4–6 s |
| Song ending early (radio edit) | 0 s | 6–10 s |
| Speech clip | 0.1–0.3 s | 0.3–0.5 s |
Why fades matter
Audio that starts or stops mid-waveform produces an audible click. Even a 50 ms fade removes it. Longer fades create a sense of polish and make loops and transitions feel natural.
Everything you can do
Cut & trim
Sample-accurate cuts with draggable handles and millisecond time inputs.
Remove a section
Delete the middle of a recording and join the rest seamlessly.
Fade in / out
Smooth 0–10 s fades so clips never start or end with a click.
Volume & speed
Boost quiet audio up to 300% and change tempo from 0.5× to 2×.
Private by design
Runs entirely in your browser. Files are never uploaded or stored.
Instant export
MP3 encoding in a background thread — the page never freezes.
Frequently asked questions
What kind of fade curve is used?
A linear gain ramp, which sounds smooth for fades of a second or longer and is the default in most editors.
Can I fade only the end?
Yes. Leave Fade in at 0 and set only Fade out.
Is MP3 Cutter really free?
Yes. Every feature — cutting, fading, volume, speed and MP3/WAV export — is free with no sign-up, no watermark and no daily limit. The site is supported by unobtrusive ads.
Are my files uploaded to a server?
No. Your audio is decoded and processed entirely inside your browser using the Web Audio API and an MP3 encoder that runs locally. The file never leaves your device, so it works even for private recordings.
Does it work on iPhone, Android and Chromebook?
Yes. MP3 Cutter runs in any modern browser — Safari on iPhone/iPad, Chrome on Android, Chrome OS, Windows, macOS and Linux. No app install is required.
Last updated · by MP3 Cutter Team