Related tools
MP4 Replace Audio
Swap the audio track on MP4 in your browser. Free, no upload.
MP4 (often H.264 + AAC) is the default for sharing. This page highlights MP4 sources: replace the soundtrack, then export — usually MP4 for the widest playback.
When to use MP4 Replace Audio vs other formats
Use when your master is MP4. WebM is web-first; MOV suits some Apple editors. You can still export MP4, WebM, or MOV after processing.
Compatibility
Exported MP4 (H.264) plays broadly on phones, TVs, and browsers.
Quality considerations
Start from clean audio; level-match to avoid jumps after the swap.
Example use cases
- Swap VO on phone MP4.
- Music under a vertical reel.
- Fix noisy room tone quickly.
Best practices
- Keep an original without the swap.
- Preview duration vs video.
- Export MP4 when unsure about devices.
Common use cases
- Social — New track on short MP4.
- Fixes — Cleaner audio on clips.
- Localization — Alternate language mix.
- Delivery — Client cut with final mix.
- Archive — Commentary version beside master.
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