Audio Fade In / Fade Out

Create smooth level ramps at the beginning and end of an audio file locally.

Choose audio file

Fade in (seconds)

Fade out (seconds)

Curve

Choose an audio fileFade lengths are limited to the loaded clip duration.

Fade timing & overlap audit

Check fade regions against decoded duration and compare the selected curve before export.

Audio evidence

Check	Value	Interpretation

Audio processing cluster

Verify the source before trusting the render

Decode locally, confirm sample rate, channels, duration and level evidence, then apply the transformation. Keep codec, browser decode and export-format limits explicit.

Start: Audio Editor Inspect a File

All 24 audio tools

Sample RateResample rate, Nyquist and output frames Stereo → MonoDownmix, correlation and cancellation risk Speed ChangerDuration, pitch and resampling behavior Loop MakerLoop boundaries, seam and repeated duration Frequency AnalyzerFFT resolution and spectral evidence Bass BoosterLow-shelf gain and clipping headroom Audio JoinerClip order, transitions and output duration Loudness AnalyzerLUFS planning, peak and dynamics

Waveform fade preview before export

Reuse the file already loaded above, see the fade regions on the waveform, and render a local listening preview without triggering a download.

Decoded duration—

Fade in—

Fade out—

Load a file above, then refresh the waveform. The preview stays local in the browser.

Codec and measurement boundaries

Browser decoding differs across Safari, Chrome, Firefox, iOS, and Android. Rendered edits are exported as WAV unless a tool explicitly states another supported container. Loudness analysis is a practical BS.1770-style estimate rather than a certified meter, and sample clipping checks do not replace true-peak oversampling.

Audio render integrity

Compatible files are decoded locally. Source and rendered signal metrics distinguish the file container from decoded PCM, and generated exports are treated as current only for the settings that produced them.

Practical guide and verification

Set fade duration after checking the decoded clip length

A two-second fade is very different on a three-second effect and a five-minute recording. Load the file first, inspect the duration, then keep fade-in and fade-out regions within the clip so the ramps do not unintentionally overlap.

Linear and equal-power-style curves sound different

A linear amplitude ramp is mathematically direct, while an equal-power-style curve can sound more natural in some listening contexts. Use the waveform as timing evidence, but choose the curve by listening because perceived loudness is not linear with sample amplitude.

Preview before downloading the rendered WAV

The preview workflow renders the selected fade locally without forcing a download. Listen through the fade boundaries for clicks, sudden level changes or an excessively long ramp, then export only after the timing and curve are acceptable.

Waveform height is not the same as perceived loudness

A waveform shows sample amplitude over time, not LUFS, frequency balance or subjective loudness. A visually small section may still be audible, so combine waveform placement with listening and use a loudness analyzer when program-level loudness matters.

Keep the source because the export changes the audio stream

The browser renders a new WAV after applying the envelope. That process does not preserve every source codec property or metadata field, so save the output as a new artifact and retain the original if later edits or a different export format may be needed.