Dual-Engine Processing (Browser & Server)
Process 100% locally in your browser for total privacy with zero uploads, or use our high-speed FFmpeg server engine for fast lossless MP4 stream copying.
Add Music to Video
Add music, songs, or audio to video online for free. Replace audio or mix background soundtrack with volume controls. 100% private browser & fast server processing.
Loading tool…
How to use Add Music to Video
- 1
Upload your video file (MP4, WebM, MOV, AVI, or MKV).
- 2
Upload the music or audio track you want to add (MP3, WAV, AAC, M4A, or OGG).
- 3
Choose your audio mode: "Replace Video Audio" to mute the original video, or "Mix Tracks" to keep both.
- 4
Adjust the volume sliders for the original video and the added music.
- 5
Toggle "Loop Music" if your video is longer than your audio track.
- 6
Preview the combined video with synchronized playback, then click Export to download.
Why use this tool?
Replace or Mix Audio Tracks
Seamlessly mute original background noise to replace with upbeat music (perfect for TikTok & Reels), or blend background music softly beneath dialogue.
Lossless Video Stream Quality
Original video frames are copied directly without re-compression, preserving 100% of your video resolution, framerate, and visual clarity.
Live Synchronized Studio Player
Listen to the live mixed audio levels directly in the interactive preview player before exporting.
Frequently asked questions
Can I keep the original video sound while adding background music?
Yes! Select the "Mix Audio Tracks" mode. You can independently adjust the volume of the original video (e.g. your voice at 100%) and the background music (e.g. ambient music at 40%).
What happens if the video is longer than the music?
Simply enable the "Loop Music" switch. The audio track will automatically repeat seamlessly until the video ends.
What video and audio formats are supported?
Videos in MP4, WebM, MOV, MKV, and AVI formats are supported. Audio tracks in MP3, WAV, AAC, M4A, OGG, and FLAC formats are all supported.
Does adding music reduce the video quality?
No. Our processing engine copies the video stream directly (-c:v copy) without re-encoding video frames, ensuring your video retains 100% of its original resolution and bitrate.
Are my videos uploaded to the internet?
When using "Browser Private Engine", all processing takes place 100% on your device using Web Audio API and MediaRecorder — zero bytes leave your computer. When using "Server Fast Engine", files are immediately deleted from temporary storage upon download.
Related tools
Images, Video & Audio
Video Trimmer
Cut, trim, and clip MP4 and WebM videos with precision start and end timestamps.
Video to Audio Converter
Extract high-quality MP3, WAV, and AAC audio tracks from MP4, WebM, and MOV videos.
Audio Recorder and Trimmer
Record microphone audio, trim sound files, and export voice recordings as MP3 or WAV.
GIF Maker & Video to GIF
Convert video clips into animated GIF files fast and free with high-quality optimization.
Watermark Images and Videos
Add custom text or logo image watermarks to photos and videos with adjustable transparency.
HEIC to JPG
Convert HEIC and HEIF photos to compatible JPG images in your browser.