Audio Fade In/Out
Add smooth fade-in and fade-out effects to any audio file in seconds. Free, no signup, works in your browser.
Everything runs inside your browser — your file is never uploaded to a server.
First run downloads the media engine (~30 MB) once, then it stays cached.
About this tool
Abrupt starts and endings make recordings sound unpolished, whether it's a podcast intro, a music clip, or a voice note. This tool adds a smooth fade-in at the start and a fade-out at the end of your audio, letting you set the exact duration in seconds for each. Under the hood it uses FFmpeg's afade filter compiled to WebAssembly, so the volume ramp is calculated sample by sample directly on your device. You can preview the result before exporting, adjust the curve length if the transition feels too sharp or too slow, and export in the same format you uploaded. Because everything runs locally, there's no waiting for an upload to finish and no limit on how many times you re-render while fine-tuning the timing.
How to use this tool
1. Choose your audio file
Select the audio file you want to add fades to from your device.
2. Set fade durations
Enter how many seconds the fade-in and fade-out should last.
3. Run the fade
Click process and FFmpeg applies the fade curves locally in your browser.
4. Download the result
Save the faded audio file straight to your device.
Why use this tool
Sudden cuts at the start or end of a clip pull listeners out of the moment. A gentle fade smooths the transition, making podcasts, voiceovers, and music clips feel professionally produced. Doing it locally means no uploads, no waiting on a server queue, and instant re-processing if you want to tweak the timing before finalizing your project.
Tips & best practices
- Use a 1-2 second fade-in for spoken word and 2-4 seconds for music to avoid an abrupt musical cutoff.
- If your recording has background hiss, a slightly longer fade-in can mask the noise floor as it ramps up.
- Combine with the audio normalizer first if levels are inconsistent, then apply fades last.
Common use cases
- Smoothing the intro and outro of a podcast episode before publishing.
- Softening the start of a voiceover clip for a video project.
- Making looped background music blend seamlessly without a hard start.
- Preparing a karaoke backing track with a clean fade-out ending.
- Polishing a WhatsApp voice note so it doesn't cut in abruptly.
Frequently asked questions
Can I set different fade-in and fade-out lengths?
Yes, each fade has its own independent duration field measured in seconds.
Will fading change my audio's overall volume?
No, only the start and end sections are ramped; the rest of the track stays untouched.
Does it work with music and voice recordings?
Yes, the fade filter applies to any audio content regardless of source or genre.
What file formats are supported?
Common formats like MP3, WAV, M4A, and OGG are accepted and exported.
Is there a limit on file length?
No hard limit, though very long files take longer to process since your device's CPU does the work.
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