Audio Merger

Add Music to Video Instantly

The easiest way to merge audio and video files online. No upload required, 100% private, and free forever.

100%
Private
0s
Upload Time
Free
No Watermark
demo_project.mp4
Export
Demo Video
00:02:14 / 00:15:00
Split

Merge Audio & Video

Seamlessly combine MP3, WAV, or M4A audio files with your video clips. No complex timeline skills needed.

Volume Control

Adjust background music levels perfectly. Balance original video sound with your added music track.

No Quality Loss

We preserve your original video quality. The audio is mixed in without degrading the visual fidelity.

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 secure WebCodecs engine.

Step-by-step Guide

  1. Click the "Upload & Edit Now" button above to open the editor.
  2. Upload your video (MP4, MOV, WebM) and audio file (MP3, WAV).
  3. Drag your video to the Main Track.
  4. Drag your audio to the Audio Track.
  5. (Optional) Use the properties panel to adjust the volume of the music.
  6. Click Export to download your new video.

Why use our tool?

  • Privacy: Your files never leave your computer. Processing happens in your browser.
  • Speed: No need to wait for uploads or downloads. Instant merging.
  • Free: No watermark, no sign-up required.