Sound Design
How to
add audio to video for free?
Adding background music to your videos shouldn't require expensive software like Adobe Premiere Pro.
With FastVideoCutter, you can merge audio and video directly in your browser using our technology.
100% Private
Browser-based processing
Instant Speed
No upload wait times
Free Forever
No watermarks
Step-by-step Guide
01
Open Audio Mixer
Click 'Start Editing' to launch the tool. Import your video (MP4/MOV) and audio file (MP3/WAV).
02
Drag to Tracks
Drag the video to the Video Track, and your song to the Audio Track below it.
03
Sync & Adjust
Move the audio clip to align with the video. Use the property panel to lower the volume if needed.
04
Export Video
Click Export. We merge the audio and video streams instantly into a new MP4 file.