Replace Video Audio Track
Swap a video's soundtrack for a different audio file — new music, dubbing, cleaner sound
The output uses your video's picture and the new audio's sound. If the two are different lengths, the result is trimmed to whichever is shorter.
⚠️ Please don't close or refresh this page until it's done, or you may lose the result.
Why people choose us
Picture untouched
The video stream is copied byte-for-byte when the codec allows it — the same instant, lossless stream-copy our mute tool uses. Only the audio is re-encoded.
Server-grade processing
Real FFmpeg on dedicated hardware: every format, big files, phone stays cool — no browser limits.
Auto-deleted in 30 min
Uploads and results are wiped from the server within 30 minutes. Nothing is kept, shared or used for training.
How it works
- 1
Upload your video and the new audio file.
- 2
Click swap — the server combines them into one MP4.
- 3
Preview and download the result. Files auto-delete in 30 minutes.
Frequently asked questions
What happens if the video and audio are different lengths?⌄
The result is trimmed to whichever is shorter, so there's never a silent tail or a frozen frame with sound still playing. Trim either file to the length you want beforehand if you need exact control.
Will the video quality drop?⌄
No — for MP4-compatible codecs the picture is stream-copied untouched (identical to the original, instant). Only the audio is re-encoded, to AAC at a solid bitrate.
What happens to my files?⌄
Both uploads and the result are deleted automatically within 30 minutes. Only your session's signed token can access the job.
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