What's the difference between the fade curves?

Linear is a straight ramp. Exponential starts slow and rushes up (or down) near the end, giving a more dramatic effect. Equal-power (sometimes called logarithmic) rises quickly at first and matches how the ear perceives loudness, which is why it's the standard choice for smooth-sounding fades and crossfades.

Can I fade in and fade out at the same time on a short clip?

Yes — if the fade-in and fade-out durations overlap (for example, a 3-second clip with 2-second fades on both ends), the tool takes the quieter of the two at every point, so the clip never gets louder than a plain crossfade would allow.

Will this work on a video file?

This tool processes audio files directly. To fade the audio in a video, extract the audio first with the Audio Extractor tool, apply the fade here, then use a video editor to swap the track back in.

Yes. Every tool is free to use, with no account and no credit card. The work runs on your device rather than on our servers, which is what keeps it free to run.

Are my files uploaded?

No. Your files are opened and processed inside your browser and are not sent to LibraTool. Some tools first download a processing engine or AI model to your browser; that download contains no data of yours.

Does it work on mobile?

Yes. It runs in current mobile browsers on iOS and Android, with nothing to install. Very large files can be slow or run out of memory on a phone, so use a computer for those.

🎚️

Free Audio Fade In/Out

Add a fade-in and fade-out to any audio clip with your choice of curve, previewed live on the waveform.

File size depends on your deviceFiles stay privateNo login requiredFree forever3 fade curvesWaveform preview

Drop a file here, or click to browse

MP3, WAV, M4A, OGG, FLAC, AAC · processed on your device

or press Ctrl+V to paste from your clipboard

Browse files

Your files never leave your device. All processing happens locally in your browser.

Fade in vs. fade out. Fade-in ramps volume up from silence at the start of the clip; fade-out ramps it down to silence at the end. Set either one to 0 to skip it — they work independently, so you can fade in without fading out, or vice versa.

The curve shape changes how the fade feels, not how long it takes — equal-power is usually the smoothest-sounding default.

How It Works

Upload an audio clip, set how long the fade-in and fade-out should be, pick a curve, and export.

1
Upload your audio
The waveform appears once it's decoded.
2
Set fade durations
Drag the fade-in and fade-out sliders — the envelope line updates over the waveform as you go.
3
Pick a curve
Linear, exponential, or equal-power (logarithmic) — each sounds a little different.
4
Preview, then export
Listen to the fade applied, then download as WAV or MP3.

Everything happens on your device — the file is never uploaded.

Related Tools

🎼

Audio Tag Editor (ID3)

Edit MP3 ID3 tags — title, artist, album, year, genre and cover art — 100% in your browser. No upload, and the audio is not re-encoded. Free and private.

Try itFiles stay local

🎵

Add Music to Video

Add music or any audio to a video: replace the original sound or mix it in, with volume, start time, loop and fade-out. The picture is copied, not re-encoded. Runs in your browser.

Try itFiles stay local

Trending

🎹

Audio to MIDI Converter

Convert MP3, WAV or a recording of piano, guitar or voice into a MIDI file. Detects chords and melodies on your device; nothing is uploaded.

Try it26 MB one-time download