Video audio reverser

A “video audio reverser” sounds like one gadget that rewinds both picture and sound. This page does audio only. You extract the soundtrack (or export a bounce), reverse that file in the browser, download a WAV, then replace the audio lane in a video editor. The picture stays forward unless you reverse it in Premiere, CapCut, DaVinci, iMovie, or similar.

That split is deliberate. Video decode, frame-accurate reverse, and re-encode of H.264/H.265 do not belong in a lightweight Web Audio tab. Sound reverse does.

Extract, then reverse, then replace

Extract. In a video editor: File → Export audio, or delete video tracks and bounce. On a phone: many cameras save MP4; use a converter or the editor’s “extract audio.” FFmpeg users already know -vn. The result should be MP3, WAV, FLAC, OGG, M4A, or AAC.

Phone video is usually AAC in M4A/MP4. Reverse M4A is the same decoder. Prefer a WAV extract if the project is serious; reverse WAV online.

Reverse. Upload the extract here. Local processing. Play: you should hear the last moment of the scene first. Speed preview is for checking a line, not a baked slow-mo soundtrack.

Replace. Import the WAV. Mute or delete the original audio. Line up time zero. If picture is still forward, lip-sync will look wrong on purpose (backwards speech on a forward face). If you also reversed picture in the video editor, align the WAV so both tails match. Mismatched lengths mean you cropped audio and video differently; fix the extract.

Do not expect this website to mux the WAV back into an MP4. That is the editor’s export.

Why not upload the whole video here

A 4K file is mostly picture. The audio decoder might ignore video, but RAM and the file picker still suffer. Browsers can freeze. Extracting a 48 kHz stereo WAV is a few megabytes per minute; that is the correct input.

If you try an MP4 and it appears to work, you got lucky with the browser’s demuxer. Do not build a pipeline on luck. Extract.

YouTube/TikTok URLs: not fetched. YouTube audio reverser, reverse audio for TikTok. Copyright still applies to the soundtrack you extracted.

Picture reverse versus audio reverse (the four combinations)

1. Forward picture, forward audio — original.
2. Forward picture, reversed audio — horror / joke, lips do not match.
3. Reversed picture, reversed audio — full rewind look; sync can hold if both were reversed over the same span.
4. Reversed picture, forward audio — rare; usually a mistake.

This page only produces the audio half of (2) or (3). You own (3)’s picture reverse elsewhere.

A cartoon tape-rewind often needs extra layers on top of a reversed soundtrack: rewind sound effect. Reverse sound for SFX-only clips without picture.

Sync, sample rate, and quality

If the extract is 48 kHz and the video timeline is 48 kHz, alignment is easier. This reverse keeps the decoded rate; it does not upsample a 32 kHz phone track into “hi-res.” Reverse audio high quality.

Variable frame rate phone video plus a cropped audio extract is a common source of drift. Reverse does not fix drift. Conform in the NLE.

The 60-second microphone button is for a new wild-sound line, not for pointing the laptop at a film. Do not re-record a movie off speakers.

Edge fades on reverse can eat a handle at the in/out. Extract a little extra audio past the video in/out, reverse, then trim on the timeline.

Checklist

1. Export audio from the video project (not a screen recording of the player if you can avoid it).
2. Upload here; confirm reverse.
3. Download WAV.
4. Replace track; decide whether picture is reversed in the NLE.
5. Export video from the NLE.

Unreverse the WAV later if you need the forward dialogue back (unreverse); keep the original extract anyway.

NLE-specific notes

Premiere / Resolve / Final Cut. Unlink audio, import WAV, drag to A2, mute A1. If you reversed picture with Clip Reverse, check whether the NLE also reversed audio; you may be stacking two reverses (forward sound on reversed picture). Decide on one combination from the four listed above.

CapCut / phone editors. Import WAV as a sound overlay. Some versions duck the original; turn original audio down to -∞. Export from CapCut, not from this website.

iMovie. Replace soundtrack; iMovie may transcode WAV to AAC on share. That is a generation after our WAV. Keep the WAV as the project audio.

DaVinci Fairlight. You could reverse the clip in Fairlight and never use this site. Use this site when the video is on a machine that has a browser and no Fairlight.

Podcast video and zoom recordings

A talking-head MP4 with a good WAV sidecar: reverse the sidecar, not a 1080p re-extract if you already have the WAV. Zoom local recordings sometimes give separate audio; use that.

Do not reverse a screen-capture of a video player. You pick up the room and a second codec. Extract from the source file.

YouTube description links: this page still will not fetch them. Download (if allowed) then extract.

Sixty-second mic: only for a new VO over a video you will sync later, not for capturing a film.