Free tool · runs in your browser

Audio Fade In / Out

Add a clean fade-in and fade-out to any audio file, with a choice of linear, logarithmic, or exponential curve. Set each length in seconds (0 = no fade), preview the source, and render the result entirely in your browser — no upload, no signup.

How to use this tool

  1. 01

    Upload your audio

    Drop in or choose any format FFmpeg supports — it's processed locally and never uploaded.

  2. 02

    Set fade durations

    Enter seconds for the fade-in and fade-out; 0 means no fade for that end.

  3. 03

    Pick a curve

    Logarithmic feels most natural for most cases; linear is uniform; exponential starts slow.

  4. 04

    Render and download

    Preview the source, render, then listen to verify the fade timing feels right before downloading.

Why this matters

A hard cut at the start or end of audio is one of those small flaws that instantly reads as 'unfinished' — it can click or pop (especially in MP3, where decoder behavior at the boundary is unpredictable), and an abrupt ending makes a podcast or song feel chopped off rather than concluded. Fades are the cheapest way to add the polish listeners only notice the absence of.

This tool builds the FFmpeg afade chain for you with a choice of curve, runs entirely in your browser with no upload or watermark, and warns when your fades would overlap and gut the track. It only fades the very start and end, so to fade an arbitrary section, cut it out first with the Audio Trimmer, fade it here, and drop it back in.

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FAQ

Use a fade-in to avoid an abrupt start — a hard cut at the top of music or speech often produces an audible click or pop — and a fade-out to make an ending feel intentional rather than chopped off. They're a basic mark of polish: podcast intros conventionally fade up under a music bed in well under a second, while outros fade the music down over a few seconds as the host signs off. Anywhere audio starts or stops cold, a short fade smooths the seam.

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