Add audio to video online
Add background music or replace the sound in any video. Upload your video and audio file. Done in seconds.
1 · Video file
Drop your video here · MP4, MOV, AVI, WEBM
or click to browse: MP4, MOV, AVI, WEBM, MKV
2 · Audio file
Drop your audio here · MP3, WAV, AAC, M4A
or click to browse: MP3, WAV, M4A, OGG
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What this tool does
Add background music to a silent clip, or swap out audio you don't want to keep for something cleaner, like narration over a screen recording. Upload the video and the audio file, and the new track is added in seconds, no editing software required.
What to do next
Frequently Asked Questions
Does this replace the existing audio, or mix with it?
The new audio track takes over, so this is best used to replace existing sound. If you want to keep the original audio and add music on top, mute isn't needed, but check current mixing behavior before relying on this for a layered result.
What audio formats can I upload?
MP3, WAV, and AAC.
What happens if my audio is longer or shorter than the video?
The two tracks are matched to the video's length.
Does this work without an internet connection after loading?
Yes, once the page loads, everything runs on your device.
What video formats are supported?
MP4, MOV, AVI, WEBM, and MKV.
Is there a file size limit?
500MB.
Will the output have a watermark?
No.
Does it work on mobile?
Yes.
Last updated: 2026-07-13