Add or Replace Audio in Video – Free Online
Upload a video + audio, pick what happens if audio is shorter (loop / silent / cut), and download your new video. No install. No watermark.
Max 150 MB
Up to 5 files · Max 50 MB each
How to replace audio in video online
Our free tool makes it easy to swap the audio track in any video. Perfect for adding background music, voiceovers, or custom sound effects.
- 1) Upload video: Select your video file (MP4, MOV, AVI, etc.)
- 2) Upload audio: Select 1–5 audio files (MP3, WAV, etc.)
- 3) Choose option: Loop, silence, or cut remaining video
- 4) Download: Save your new video with replaced audio.
Why replace audio in videos?
- Add background music: Make your videos more engaging with custom soundtracks.
- Add voiceovers: Record narration separately and sync it with your video.
- Fix bad audio: Replace poor quality recordings with better audio.
- Localization: Add audio in different languages for international audiences.
- Social media: Add trending sounds or music to your content.
FAQ
Is this tool free?
Yes, completely free with no hidden costs or watermarks.
What's the maximum file size?
Videos up to 150 MB and audio files up to 50 MB each (max 5 files).
Will video quality be affected?
No, the video stream is preserved. Only the audio track is replaced.
What if audio is longer than video?
The audio will be trimmed to match the video length automatically.
What if audio is shorter than video?
You can loop the audio, leave the rest silent, or cut the remaining video.
Are my files kept on your server?
Files are processed on our server and automatically deleted after a short time. We don't store or access your content.