Fade audio in and out and lower the volume of video or audio files. Preview and download MP4 video or WAV audio, processed locally in your browser.
Processed on your device · No account · No added watermark
Choose audio or video
Up to 10 minutes. Video: 250 MB. Audio: 50 MB, mono/stereo, up to 96 kHz. Browser codec support is required.
Choose an audio file or a video with an audio track. Set fade-in and fade-out in seconds; their sum cannot exceed the duration. Set volume from 0% (silence) to 100% (original level). Video preview uses the same scene as export. For audio, apply the settings to create a WAV you can audition before downloading. Changing settings clears the old result.
These tools support files your browser can decode. Each video can be up to 250 MB and 10 minutes. Audio-only files can be up to 50 MB and 10 minutes, mono or stereo. MP4 export re-encodes H.264 video at 30 fps; audio-only export produces 16-bit PCM WAV, which may be larger than the source. Video export needs WebCodecs encoding support. Keep the tab open or cancel the current operation.
No. Your files are processed on your device, with no account or credits needed. The website may load scripts, but these tools do not upload media or submit rendering jobs. Save the output before leaving the page.