Add Audio to Video
Add Audio to Video is a free online tool that lets you add or replace the soundtrack of a video with an audio file. It runs entirely in your browser — no sign-up, no watermark, and your files are never uploaded.
Free · unlimited · processed privately in your browser
or drag and drop files here
Supported: MP4, MOV, MKV, WEBM, AVI, FLV, WMV, MPEG, MPG, 3GP, OGV, M4V, TS, MP3, WAV, OGG, AAC, M4A, FLAC · up to 50 files
Your files stay private — 100% in your browser
We never upload your files, photos, or videos to any server. Everything is processed directly in your browser, so your data never leaves your device. That means zero privacy worries — no one else can ever see or store what you convert.
- No uploads
- Processed on your device
- No sign-up needed
About Add Audio to Video
Add Audio to Video is a free online tool that lets you add or replace the soundtrack of a video with an audio file. There is no sign-up, no watermark, and no limit on how many times you can use it. The whole process happens on your own device using your browser, so your media is never uploaded and nobody else can access it.
After you upload
Upload one video and one audio file. The audio replaces the video's existing soundtrack.
Options explained
- Files
- The result is trimmed to whichever of the two is shorter, so the audio and video stay in sync.
How to use Add Audio to Video
- 1Click Choose Files and upload your file.
- 2Adjust any available options for your needs.
- 3Press Run to process the file in your browser.
- 4Download your result instantly.
Frequently asked questions
Is Add Audio to Video free?
Yes — Add Audio to Video is free to use as often as you like, with no account, no caps, and no watermark on the output.
Do I need to install anything?
Nothing to install. Add Audio to Video works inside your web browser on desktop and mobile — no app, codecs, or plugins needed.
Are my files uploaded to a server?
No. Your media files are processed on your own device and never sent to a server, so they stay private.
How to add audio to a video?
Use Add Audio to Video above: upload your file, run it, and download the result. It is free with no limits or sign-up, and the whole process happens on your own device using your browser, so your media is never uploaded and nobody else can access it.
How to add music to a video?
Use Add Audio to Video above: upload your file, run it, and download the result. It is free with no limits or sign-up, and the whole process happens on your own device using your browser, so your media is never uploaded and nobody else can access it.
How to replace audio in a video?
Use Add Audio to Video above: upload your file, run it, and download the result. It is free with no limits or sign-up, and the whole process happens on your own device using your browser, so your media is never uploaded and nobody else can access it.