editvideo.tools / tools / Add Audio to Video
Tool · Edit
Add Audio to Video
Add a music or voice track to any video, replacing the original audio. Loop the track to fit — video copied losslessly.
Drop a video here
MP4, WebM, MOV, MKV — anything your browser can decode.
PRIVATE BY DESIGN — PRIVATE BY DESIGN — decoding, processing and encoding all run in your browser's engine. No server sees your file.
How to Add Audio to a Video
Drop your video, pick an audio file (MP3, M4A or WAV), and download. The new track replaces the video's original sound.
Tip: tick "loop to fit" so short music repeats to cover the whole video.
FAQ
Frequently asked questions
Is Add Audio to Video really free?
Yes — completely free, with no hidden fees, no premium tier and no signup required. The tool runs entirely in your browser.
Do I need to install anything to use Add Audio to Video?
No. Add Audio to Video works directly in your browser. There is no software to install, no app to download and no plugin required.
Is my video uploaded to a server when I use Add Audio to Video?
Never. All processing happens locally on your device. Your file never leaves your computer, which is why there is no upload wait and no privacy risk.
Which video formats does Add Audio to Video support?
It accepts MP4, WebM, MOV and MKV — anything your browser can decode. Output is MP4 by default, playable on any device.
What happens to my file after processing?
Nothing is stored anywhere. Once you close the tab, everything is gone. We have no server, no storage and no access to your files.
Will my video have a watermark?
No — every download is 100% watermark-free. EditVideo never adds logos, branding or watermarks to your files.
Will adding music add a watermark to my video?
No — every download is 100% watermark-free. EditVideo never adds logos or watermarks to your files, with or without music.