How to Use
- Click the drop zone above or drag-and-drop your audio file (MP3, WAV, OGG, AAC, M4A, FLAC).
- Set the Fade In duration — how long the audio takes to reach full volume from silence.
- Set the Fade Out duration — how long the audio fades to silence before the end.
- Click Apply Fade and wait for FFmpeg to process the file in your browser.
- Click Download Audio to save the processed MP3 to your device.
Features
100% Browser-Based
Powered by FFmpeg.wasm — your audio never leaves your device.
Independent Fade Controls
Set fade in and fade out separately from 0 to 30 seconds each.
Multiple Format Support
Accepts MP3, WAV, OGG, AAC, M4A, FLAC. Output is high-quality MP3.
Quick Presets
One-click presets for common fade durations (1s, 2s, 3s, 5s, 10s).
Mobile Friendly
Works on modern Android and iOS browsers without any app install.
Completely Free
No sign-up, no watermark, no limits beyond device memory.
Use Cases
FAQ
What audio formats are supported?
The tool accepts MP3, WAV, OGG, AAC, M4A, and FLAC input files. The output is always high-quality MP3 (192 kbps) for maximum compatibility across devices.
Is my audio uploaded to a server?
Absolutely not. All processing happens inside your browser using FFmpeg compiled to WebAssembly. Your file never leaves your device.
What is the maximum fade duration?
You can set fade in or fade out up to 30 seconds each. Both are optional — set either to 0 to skip it. Make sure the combined fade durations don't exceed the total audio length.
Does the tool change audio quality?
The output is re-encoded to MP3 at 192 kbps. For most listening purposes this is excellent quality. If you need lossless output consider using a dedicated DAW after using this tool to prepare your fade times.
Why does processing take a moment?
The first time you process a file, FFmpeg.wasm (~25 MB) needs to load in your browser. Subsequent processes in the same session are much faster. Closing other tabs can speed things up.