Loona Audio Fade Editor - Add Fade In & Fade Out Online Free
Songs that start at full blast, voice notes that end mid-word, podcast clips that stop abruptly - a short fade fixes all of them. Set how many seconds the sound should take to rise and to fall, preview it, and download the polished result as WAV.
How to add fades to an audio file
- Click the box above or drag your audio file into it - MP3, WAV, M4A and OGG all work.
- Set the fade-in slider (how long the sound takes to reach full volume) and the fade-out slider (how long it takes to disappear at the end). Each can be 0 to 10 seconds.
- Press "Play With Fades" to hear the result.
- Click "Download WAV With Fades" and the finished audio saves to your device.
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Frequently Asked Questions
Is the Audio Fade Editor free?
Yes. It is completely free with no sign-up, no watermark and no limit imposed by us.
Are my audio files uploaded to a server?
No. Your file is decoded and faded 100% inside your browser with the Web Audio API. It never leaves your device.
How long can the fades be?
Each fade can be from 0 (no fade) up to 10 seconds, in half-second steps. If both fades together are longer than the file, they overlap in the middle - the tool warns you, because the audio then never reaches full volume.
Are the fades straight lines or curved?
They are smooth straight (linear) ramps: the volume rises evenly from silence to full over the fade-in, and falls evenly back to silence over the fade-out. Linear fades are the standard choice for intros, outros and voice clips.
Which formats can I use?
Any format your browser can decode - MP3, WAV, M4A and OGG in all modern browsers. The result downloads as a standard WAV file that plays everywhere.
How it works
Your file is opened right inside your browser and decoded into raw sound samples with the Web Audio API - nothing is uploaded to any server. During an offline render, a volume control raises the level smoothly from silence to full over your fade-in seconds at the start, and lowers it back to silence over your fade-out seconds at the end, and the result is saved as a WAV file.
Worked example
You have a 30-second background-music clip for a video, and it starts and stops abruptly. You set fade-in to 3 seconds and fade-out to 5 seconds. Now the music rises gently under your opening shot and melts away during the last 5 seconds of the video instead of cutting off - and you download the WAV ready to use.
Fades also remove the small click that many recordings have at the very start or end, because the level now begins and ends at true silence.
More questions
What fade lengths work best?
For songs and podcast intros, 2-5 seconds feels natural. For voice notes and ringtones, 0.5-1 second is usually enough to remove the click at the start and end.
Why is the downloaded file bigger than my MP3?
The export is WAV, the uncompressed format your browser can create natively. It keeps the audio exactly as faded, but the files are larger than MP3. Any standard converter can turn the WAV into MP3 afterwards.
Can I fade only the start or only the end?
Yes - set the fade you do not want to 0 seconds and it is left exactly as it was.
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