How do I add smooth fade-in and fade-out effects to audio?

Upload your audio track, select fade-in duration (e.g. 2s) and fade-out duration (e.g. 3s), choose curve type (linear or exponential), and export.

NexLove Media

Audio Fade In & Fade Out Editor

Apply smooth Fade In at the start and Fade Out at the end of songs and voice notes. Choose linear or exponential volume curves with real-time waveform preview.

TL;DR: Audio Fade In & Fade Out Editor is a 100% free browser-based media utility. Apply customizable fade-in and fade-out volume curves to audio tracks.

Select Audio File to Apply Fade

Apply Fade In and Fade Out curves

Understanding Audio Fade In & Fade Out Editor

Apply smooth Fade In at the start and Fade Out at the end of songs and voice notes. Choose linear or exponential volume curves with real-time waveform preview. Designed for creators, video editors, audio engineers, web designers, and developers who need instant, high-precision processing without software installation, watermarks, or file uploads.

Mathematical Formula & Technical Methodology

y(t) = x(t) \times \left(\frac{t}{T_{\text{fade}}}\right)^p, \quad p \in \{1 \text{ (linear)}, 2 \text{ (exp)}\}

Formula Variables Explained:
Multiplies PCM audio samples by an increasing or decreasing gain transfer envelope.

Step-by-Step Worked Example

A 3.0s exponential fade-in creates a seamless, natural entrance for music intros.

100% Client-Side Privacy Guarantee

All media decoding, manipulation, calculations, and encoding execute locally inside your web browser using HTML5 Canvas, Web Audio API, WebCodecs, Web Crypto, and modern JavaScript engines. Zero server uploads, zero telemetry, and no registration required.

Frequently Asked Questions

: Upload your audio track, select fade-in duration (e.g. 2s) and fade-out duration (e.g. 3s), choose curve type (linear or exponential), and export.

Embed This Tool

Add the live Audio Fade In & Fade Out Editor to your own website with this embed code:

<iframe src="https://nexlove.org/embed/audio-fade-tool.html" width="100%" height="650" style="border:1px solid #e2e8f0;border-radius:12px" title="Audio Fade In & Fade Out Editor — NexLove" loading="lazy"></iframe>

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