Add Music to Video — Multi-Track Audio Mixer

A free browser-based tool for adding background music, sound effects, or voiceover to any video. Supports MP4, WebM, MOV, and other formats with volume control and timeline positioning.

How to Add Music to a Video

1

Upload your video — drag and drop or click to browse

2

Click "Add Audio Track" to load music, SFX, or voiceover

3

Adjust volume, position, trim, and fade for each track

4

Preview the mix, then click "Export Video" to download

Layer background music, sound effects, and voiceover on your video

Upload video file
MP4, WEBM, MOV, MKV, AVI, WMV, FLV, 3GP ·
Upload a file to start
File:
Duration:
Size:
Resolution:
Video:
Audio:
0:00 / 0:00
Export Settings
Format:
Audio bitrate:
Channels:
Processing cancelled. You can start again when ready.
Done!

Features

Up to 4 audio tracks with per-track volume and mute
Layer the original video sound plus three more tracks for music, sound effects, and voiceover, each with its own volume slider and mute.
Live preview via Web Audio API — hear changes instantly
The Web Audio API plays your mix back in real time, so you can balance music against speech before committing to an export.
Trim, offset, fade in/out, and loop each track
Set an exact start offset in seconds, trim each clip, add fade in/out, and loop a short track to fill the full video length.
Runs in your browser via WebAssembly — no installation needed
FFmpeg WebAssembly stream-copies the video and re-encodes only the audio, mixing MP3, WAV, AAC, OGG, FLAC, M4A, or WMA into the file.

Why Use Tembrica to Add Music to Video

Most online tools limit you to a single audio track, add watermarks, or process on their servers. Tembrica gives you a full multi-track timeline with up to 4 audio layers, real-time preview, and browser-based processing. No watermarks, no sign-up, no file size tricks — just a professional audio mixer that runs entirely on your device.

Frequently Asked Questions

How many audio tracks can I add?

You can have up to 4 audio tracks total: the original video audio plus 3 additional tracks for music, sound effects, or voiceover.

Does adding music reduce video quality?

No. By default we use stream copy for the video track — it stays byte-for-byte identical. Only the audio is re-encoded. You can optionally re-encode the video to a different format or quality.

Can I adjust when the music starts playing?

Yes. Drag the audio clip on the timeline or enter an exact offset in seconds. You can also trim the start and end of each audio track independently.

What if my music is shorter than the video?

Enable the "Loop" option in Advanced Settings. The audio will repeat seamlessly until it matches the video duration.

What formats are supported?

Video: MP4, WebM, AVI, MKV, MOV, WMV, FLV, 3GP. Audio: MP3, WAV, AAC, OGG, FLAC, M4A, WMA.

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Who is this tool for?
🎬 Video Creators ✨ Content Creators
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