What does Add Audio to Video do?
Replace discards the original soundtrack, while mix combines the first existing track with the added track. Positive offset delays the new audio. Trim makes video duration win; without trim, longer sound holds the last picture. Looping stops with the video. Review final synchronization before publishing.
How to use Add Audio to Video
- 1Upload a video and a local audio track.
- 2Choose replace, mix or add to silent video.
- 3Set volumes, offset, trim, looping and optional fades.
- 4Export MP4 and check synchronization before downloading.
Supported inputs and outputs
Inputs
Local video and MP3, WAV, M4A or OGG audio
Outputs
MP4 with added or mixed audio
Practical uses
- Prepare and review a creator recording with add audio to video.
Browser and media limitations
- Use only audio you have permission to publish; duration mismatches are trimmed, padded or extended according to your settings.
- Large files can exceed browser memory. Playback and codec support differ by browser.
How local processing works
Your media is processed locally in your browser and is not uploaded to Tubelexity for processing. Page requests, engine downloads and privacy-filtered analytics still use the network.
Frequently asked questions
How does mix differ from replace?
Replace discards the original soundtrack. Mix combines its first audio track with the new track using independent volumes and a peak limiter.
What happens when audio is shorter?
It is padded with silence unless looping is enabled. An offset adds silence before the new audio starts.
What if audio is longer than video?
Trim ends it at the video duration. Without trim, the last video frame is held until the audio ends. Looping always stops with the video.
Does it upload my music?
No. Your media is processed locally in your browser and is not uploaded to Tubelexity for processing.