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Toolzum

Fade In/Out

Apply smooth volume fades to your audio tracks. Supports fade in, fade out, or both with linear, logarithmic, exponential, and S-curve transitions. Perfect for podcast intros and outros. Audio never leaves your device — conversion and editing run locally in your browser with FFmpeg WASM.

Runs on FFmpeg

100% Local Browser Native

How to Use the Fade In/Out

1. Upload an audio file

MP3, WAV, M4A, FLAC, or OGG — processed locally.

2. Set fades and curves

Fade in, fade out, or both — length in seconds or % with linear, log, exp, or S-curve.

3. Preview and download

Check the curve preview, then save straight to your device.

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Frequently Asked Questions

What fades can I shape?

Linear, logarithmic, exponential, and S-curve fades with adjustable length (0.5–30 seconds, or 0–100% of the track in percentage mode).

Intros, outros, or both?

Either end independently — fade in, fade out, or both together (defaults: 2 s in, 3 s out).

Clicks at boundaries?

Proper fades eliminate the pops that hard cuts leave. Proper fades eliminate the pops that hard cuts always leave.

Is my audio uploaded anywhere?

No — processing runs locally in your browser; unlimited saves on local tools.

Last updated October 2026