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Top Free Audio and Video Mergers Online/Offline You Can’t Miss

Last Updated: Jul. 21, 2021

Professional video editors always suggest adding audio files after a video is edited and done because voice collecting while shooting can’t achieve the best result. If you want to merge audio and video online for free, a powerful audio and video merger is necessary.

No need to do endless searching. After hundred times of trial, we collected the best audio and video mergers online. They are all free to use! Pick the best one to help you join audio and video files. Let’s get started!

Also Read: 8 Best Video Background Music Resources >

Best Free Audio and Video Mergers Online/Offline

1. Best Audio and Video Merger - FlexClip

FlexClip’s online audio and video merging tool is easy-to-use. To join video and audio, all you have to is uploading the video and audio files, syncing the video and audio by dragging the slider. This online video editor also provides you a set of powerful video editing tools, like video speed changer, video filters. Remember to give those tools a try to level up your video!

After you successfully merged audio and video, you can one-click to share the video to YouTube or download to your computer. Easy and effective!

How to Merge Audio and Video with FlexClip

Step 1
Click on the Create a Video button to get started.
Step 2
Drag and drop your video clip to the Media section and then apply it to the storyboard.
Merge Audio and Video - Step 2

Merge Audio and Video - Step 2

Step 3
Go to the music section and upload your audio file.
Merge Audio and Video - Step 3

Merge Audio and Video - Step 3

Step 4
Click on Trim to sync your video and audio.
Merge Audio and Video - Step 4

Merge Audio and Video - Step 4

Step 5
Continue editing or select a resolution to download directly.

2. Clideo

Clideo is another easy-to-use audio and video merger. It instantly combines your videos, photos and music into one integrated video, even videos and photos online. The supported media formats are MP4, AVI, MPG, VOB, WMV, MOV and more.

The editing panel would be in timeline, an editing mode that many professional editors will choose. If you are a green hand, don’t feel panic. It’s easy to operate.

How to Merge Video and Audio with Clideo

Step 1
Visit Clideo's add music to video theme page.
Step 2
Drag and drop a video from your computer and then you'll be brought to the editor.
Step 3
Upload the music file and sync it with your video.
Merge Audio and Video with Clideo

Merge Audio and Video with Clideo

3. Kapwing

Kapwing merges any videos and audio files to help tell your stories. The drag-and-drop timeline enables you to upload audio and video files and rearrange them smoothly. It’s perfect for beginners on Windows, Mac and Linux. If you have a team, you can work collaboratively on the same video.

Kapwing does put a watermark on your video. However, to merge audio and video without a watermark, you have to sign in.

How to Merge Audio and Video with Kapwing

Step 1
Go to Kapwing's Add Music to Video theme page and enter the timeline editing panel.
Step 2
Drag your video to the timeline, and add your music to the subshaft.
Step 3
Sync the music and video.
Merge Audio and Video with Kapwing

Merge Audio and Video with Kapwing

4. Windows Photos

Windows comes with the Photos application that allows you to make basic edits. It can be somewhat complicated to operate, but you don’t have to worry about video quality and any security issues.

How to Combine Audio and Video with Windows Photos App

Step 1
Launch Photos application on Windows 10. Go to New Video > New Video Project at the top.
Step 2
Name Your Project.
Step 3
Click the “Add” button, then select the video you want to add the audio to.
Step 4
Drag and drop the video to the timeline.
Step 5
Click “Custom Audio”, select an audio file.
Step 6
Drag the slider to control when the audio begins to play and stop.
Step 7
Click Done to save the changes.

5. VLC

VLC is an open-source media player as well as an excellent video editor. It does a great job to combine audio and video files, then save to a local folder. You can also select the desired format.

How to Merge Audio and Video on VLC

Step 1
Launch VLC Media Player on your computer. Click Open Media > Open Multiple Files.
Step 2
Click on the Add button to select a video.
Step 3
Tick the option Show More to display more options.
Step 4
Check the box at Play Another Media and select your audio file.
Step 5
Go to the Play tab and select Convert option.
Step 6
Select a desired format from the Profile tab. Click the Start to start merging.

Bonus Tip: Merge Video and Audio with FFmpeg

To merge video and audio with audio re-encoding, try:

ffmpeg -i video.mp4 -i audio.wav -c:v copy -c:a aac output.mp4

You may also want to copy the audio without re-encoding, the following will work.

ffmpeg -i video.mp4 -i audio.wav -c copy output.mkv

If your input video already contains audio, and you want to replace it, you need to tell FFmpeg which audio stream to take:

ffmpeg -i video.mp4 -i audio.wav -c:v copy -c:a aac -map 0:v:0 -map 1:a:0 output.mp4

The Bottom Line

The above are five ways to merge video and audio. If you are not satisfied with the results, you can always replace the audio in video. So, which works best for you? Tell us via Facebook. You are also welcomed to reach our support team if there are any questions.

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