Runs entirely in your browser - no upload, no sign-up.
Your source and faded audio stay in this browser tab. The audio is never uploaded.
An audio fade in raises volume smoothly from silence at the start, while a fade out lowers it to silence at the end. Set each duration, choose a curve, preview the effect, and download a WAV. Processing stays in your browser, so the source audio is never uploaded.
Drop in a browser-supported MP3, WAV, M4A, AAC, FLAC, OGG, Opus, or WebM audio file.
Adjust the fade in and fade out independently, or start with a quick cleanup, intro and outro, or long outro preset.
Pick smooth, linear, or exponential, then play the source to hear the selected volume envelope.
Apply the fades locally, listen to the finished WAV, and download it to your device.
The preview changes playback volume in real time. Export loads a WebAssembly build of FFmpeg only when you create the result, applies the same fade settings to the audio samples, removes source metadata, and writes an uncompressed 16-bit WAV.
Choose smooth for a natural musical envelope, linear for a constant amplitude change, or exponential for a more dramatic shape. Fade lengths stay inside the source duration and never overlap.
No. File selection, preview, fade processing, and WAV creation happen inside your browser tab. The first export downloads the FFmpeg engine code, but your recording is not sent with that request. Closing or refreshing the tab releases the temporary source and result URLs.
Yes. You can preview, process, and download faded audio without an account, subscription, credit limit, or watermark. The practical limits come from your browser memory and device speed because the entire source and uncompressed WAV result must fit locally.
The file picker accepts common audio formats including MP3, WAV, M4A, AAC, FLAC, OGG, Opus, and WebM. Your browser must read the duration for exact fade placement. The conservative size limit ranges from 100 MB on mobile or lower-memory devices to 250 MB on typical desktops.
Use smooth quarter-sine for most music and speech because it tends to sound natural. Linear is useful for short technical fades and predictable amplitude changes. Exponential keeps the signal quieter for more of a fade in, or drops it faster during a fade out, creating a stronger effect.
Use about 0.01 to 0.05 seconds to remove a click, 0.2 to 1 second to soften a clip edge, and 2 to 8 seconds for a song or podcast ending. The right duration depends on rhythm, speech cadence, and how quickly you want attention to shift.
No. A fade multiplies sample amplitude with a changing gain envelope. It does not trim, stretch, resample, or pitch-shift the source, so the result keeps the same duration and pitch. Only the loudness near the beginning and ending changes.
The result is a 16-bit PCM WAV so the fade does not add another lossy compression pass. WAV files are larger than MP3 or AAC, but they are widely supported and suitable for further editing. Use an audio converter afterward if you need a smaller delivery format.
