What is an audio fade?

A fade-in gradually increases volume from silence to full at the start of a clip. A fade-out gradually decreases volume to silence at the end. Fades are used to avoid abrupt starts and endings, making transitions sound professional.

What fade shapes are supported?

Linear fades change volume at a constant rate. Logarithmic (equal-power) fades follow the equal-power curve used in DJ crossfading and radio production — they sound more natural to the human ear than linear fades. Both options are available.

How long should the fade be?

For spoken word and podcasts, 0.2–0.5 s fades work well. For music, 1–3 s is typical for endings. Long ambient outro fades can be 5–10 s. Set both fade-in and fade-out independently.

Can I apply only a fade-in or only a fade-out?

Yes. Set either duration to 0 to skip it. You can fade in without fading out, and vice versa.

Is my file uploaded to process the fade?

No. The fade is applied entirely in your browser using the Web Audio API OfflineAudioContext and gain automation. Nothing leaves your device.

What formats can I use as input?

Any format your browser can decode: MP3, WAV, OGG, FLAC, AAC/M4A. Output is WAV (16-bit PCM), which is universally compatible.

What if my fade duration is longer than the file?

The tool automatically clamps the fade duration to half the file duration to prevent the fade-in and fade-out from overlapping. A status message will show the clamped value.

Can I preview the faded audio before downloading?

Yes. After processing, the audio player appears with the faded result. Play it to verify before downloading.

Audio Fade

Add smooth fade-in and fade-out effects to any audio file. Adjustable duration and curve shape, output as WAV — no upload needed.

100% client-side · no upload

Audio file

Load an audio file to begin.

How to add fades to audio

Choose your audio file using the file picker.
Enter the fade-in duration in milliseconds (or 0 to skip).
Enter the fade-out duration in milliseconds (or 0 to skip).
Select Linear for a straight-line fade, or Equal-power for a natural-sounding curve.
Click Apply Fades, preview the result, then download.

Common use cases

Podcast endings: Fade out the last few seconds of music or speech smoothly.
Intro music: Fade in a background track so it does not jar the listener.
Ringtone finishing: Add a short fade-out so the tone does not cut off sharply.
Sample loops: Add tiny fades to remove clicks at loop points in audio samples.
Voice recordings: Apply a fade-in to remove pre-roll noise before speech begins.

Related tools: Audio Trimmer · Volume Normalizer · Audio Merger · Audio Converter

Frequently Asked Questions

What is an audio fade?: A fade-in gradually increases volume from silence to full at the start of a clip. A fade-out gradually decreases volume to silence at the end. Fades are used to avoid abrupt starts and endings, making transitions sound professional.
What fade shapes are supported?: Linear fades change volume at a constant rate. Logarithmic (equal-power) fades follow the equal-power curve used in DJ crossfading and radio production — they sound more natural to the human ear than linear fades. Both options are available.
How long should the fade be?: For spoken word and podcasts, 0.2–0.5 s fades work well. For music, 1–3 s is typical for endings. Long ambient outro fades can be 5–10 s. Set both fade-in and fade-out independently.
Can I apply only a fade-in or only a fade-out?: Yes. Set either duration to 0 to skip it. You can fade in without fading out, and vice versa.
Is my file uploaded to process the fade?: No. The fade is applied entirely in your browser using the Web Audio API OfflineAudioContext and gain automation. Nothing leaves your device.
What formats can I use as input?: Any format your browser can decode: MP3, WAV, OGG, FLAC, AAC/M4A. Output is WAV (16-bit PCM), which is universally compatible.
What if my fade duration is longer than the file?: The tool automatically clamps the fade duration to half the file duration to prevent the fade-in and fade-out from overlapping. A status message will show the clamped value.
Can I preview the faded audio before downloading?: Yes. After processing, the audio player appears with the faded result. Play it to verify before downloading.

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