Set fade-in and fade-out
Adjust the seconds and use the curve preview to see how the envelope affects the clip.
The curve updates as you change the durations.
Progress0%
Choose an audio file first.
Output preview
Load audio to see the local preview.
Features and quick guide
Control the first and last seconds visually
Each sample receives a linear fade envelope based on time, while Canvas displays the expected curve. Processing and export stay in the browser.
3-step quick guide
- 1Choose an audio file and wait for decoding and the curve preview.
- 2Set fade-in and fade-out seconds, then confirm the curve and preview.
- 3Choose WAV or MP3, export, and download the processed audio.
Zero-upload privacy promise
Audio is processed in this browser with Web Audio API, Canvas, and Blob; it is never sent to a server.
No upload endpoint is used; speed depends on your device and browser support.
Frequently asked questions
Does fading change pitch?
No. It changes sample amplitude without changing the sample rate or playback speed.
Can fade seconds exceed the clip length?
The tool caps each effect within the clip duration to avoid unexpected overlap.
Does MP3 export require an upload?
No. The MP3 encoder runs locally in the browser and exposes a downloadable Blob.