How to reverse a short audio file
1. Drop one audio file you already have. Video and pictures are refused here. 2. Read the note: only files under the limit on the page are accepted, because the whole file is decoded first. 3. Press “Reverse audio” and play the download from the start.
A voice note that says a name and then a number comes back with the number first. GustKit re-encodes the file in this tab and keeps the type: WAV stays WAV, MP3 stays MP3. The length stays about the same. Keep the original until the backwards version is the one you wanted.
Backwards audio is not a reversed video
Reverse video turns a short clip around, picture and sound together. This page takes audio only and uses the FFmpeg areverse filter. Change audio speed shortens or stretches the file and keeps the words facing forward. Add silence inserts quiet time and does not flip the recording.
The audio stays in this tab
The first visit downloads FFmpeg. Later visits reuse the browser cache. A file longer than the limit is refused, because areverse holds the decoded audio in this tab. GustKit does not fetch audio from a link.
How to hear the backwards file before you replace the original
1. Play the download from the first second. The ending of the original should be what you hear first. 2. Check the length. It should stay close to the original, not grow like added silence. 3. Keep the original until a name or a number lands where you expect.
Reverse video is the page that also turns the picture around. Change audio speed keeps the words facing forward. Files over the limit are refused because the whole file is decoded. Nothing is uploaded.