Best Audio and Video Mergers to Combine Audio and Video Easily & Effectively

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Best Audio and Video Mergers to Combine Audio and Video Easily & Effectively

Last Updated: 2025. 10. 27

Professional video editors always suggest adding audio files to video in the postproduction process, because voice collecting while shooting can’t achieve the best result. If you want to merge audio and video with perfect quality, a powerful audio and video merger is necessary.

Stop guessing and start creating! We've tested 30 tools and rounded up the 10 best free audio and video mergers. Check their best features and hidden limitations, then pick one to join your files in no time.

TLDR

No matter what your skill level, the following 10 tools will always get your audio perfectly synced with video. FlexClip and CapCut use AI to help make accurate audio/video merge. Clideo, Adobe Express, and OnlineConverter are perfect if you don't want to install anything. iMovie and ClipChamp are built-in video editors on your computer, perfect for everyday use, while OpenShot, VSDC, and VLC are open-source video tools, free options with lots of advanced features.

1. Top AI Audio and Video Merger: FlexClip

Free Plan Limitation: Up to 720P export resolution & 10 minutes maximum length.

FlexClip’s online audio and video merger is simple and intuitive. As a timeline-based video editor, FlexClip lets you upload multiple video and audio files, then seamlessly sync them by dragging the slider, all the way up to 4K resolution.

Besides simple audio and video merging, FlexClip also polishes your video to perfection. You can improve the quality of audio and video by applying effects to videos, reducing background noise from audio, or even creating a brand new SFX that matches the video. Ignite your creativity, take your video into the next level.

How to Merge Audio and Video with FlexClip

Step 1

Click on the Merge Video and Audio button to access FlexClip's editing tools. By the way, FlexClip also offers tons of free templates for you to customize. Remember to check them out for endless inspirations.

Merge Video and Audio

Step 2

Go to the Media section, upload your video clips, music files from a local folder, mobile device, or cloud service to FlexClip. If you don't have any resources to get started, FlexClip offers millions of royalty-free videos and music for you to use. Move to Video and Music section to get what you need.

Upload Music Video to FlexClip

Step 3

Click on the Add as Scene button to apply the video clips and music to the timeline. Drag and drop will also do!

Merge Audio and Video with FlexClip

Step 4

Make edits so that the music perfectly syncs with the video. Edits you can make include trimming, splitting, adjusting the starting point, etc. All the basic editing tools are above the preview window. Navigate to the Tools kit, you can use AI to generate sound effects, AI voiceover, or add auto subtitle. Give them a try!

Polish Audio and Video with FlexClip

Step 5

Continue editing or select a resolution to download directly. As mentioned above, you can also save them to cloud services, post to social media, or share via a short link.

Save & Share Merged Audio & Video

2. Clideo

Free Plan Limitation: Watermark on all exports, a 500 MB file upload size limit, and a lower processing speed.

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.

Here is one more thing to be noted. To use Clideo, you have to register. As for non-subscribers, a watermark will be added to the output.

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

3. CapCut

Free Plan Limitation: 1080P resolution with watermarks on all videos. Most editing features and resources are also behind the paywall.

CapCut is a audio and video merger working across all devices. You can download the CapCut software and use it on computer desktop, navigate to its official website and kick start right on browser, or install the CapCut app on mobile. No matter which way you go, video and audio combination would be easy.

What sets CapCut apart is its TikTok-popular resources. It includes trending music tracks, effects, transitions, fonts, etc. These built-in assets let creators easily craft videos that easily get popular. Also, you can play some tricks to change voice, adding AI avatar, etc.

How to Merge Audio and Video with CapCut Online

Step 1

Get started with CapCut online using a browser, then click the Upload button to import all your videos and audio clips. You can also drag and drop resources to the Media section.

Step 2

Add the audio and video to the timeline, then align the video and audio tracks for perfect synchronization.

Step 3

Edit to the perfection. You can trim, split, or remove sections of the video and audio tracks, adjust the volume, apply sound effects to give your video a fun touch.

Merge Audio and Video with CapCut

4. Adobe Express

Free Plan Limitation: Free version limits you to 16:9 aspect ratio and original video quality. Plus, you can't overlay multiple audio in the timeline.

Not all software inside Adobe requires advanced editing skills. Adobe Express is designed to make video editing as simple as photo editing. With its clean, drag-and-drop interface, you can quickly upload clips, trim them, apply background music or voiceover in clicks. Everything runs smoothly online, no editing skills needed.

However, Adobe Express doesn't come with advanced editing tools, like volume adjustment, color correction, masking, etc. It is perfect for those who are after big names but new to video editing.

How to Merge Audio and Video with Adobe Express

Step 1

Visit Adobe Express website, hit the Get Adobe Express Free button to access its editing panel.

Step 2

Under the Add Content section, upload videos and audio files as a layer or scene.

Step 3

Drag and drop to adjust sequence, trim the video/audio length, etc. You can also rely on other tools to crop the video, add comments so that others can corporate with ease.

Merge Audio and Video with Adobe Express

5. OnlineConverter

Limitation: You can only upload videos in 250MB.

OnlineConverter can help join audio and video. Whether you want to add new audio to the video while retaining the old, or replace the audio in the video, you can achieve that.

Since OnlineConverter is just a tool, it doesn't provide you any editing tools. By default, the output video will have the same duration as the original video, and if the video is longer than the audio, the audio will automatically loop itself.

Step 1

First up, get OnlineConverter's Add Audio to Video page. Upload your video and audio from a local folder.

Step 2

Set up audio preferences such as replace audio in video, loop, volume. Then hit Convert.

Merge Audio and Video with OnlineConverter

6. ClipChamp

Free Plan Limitation: 1080P export resolution and restricted access to stock media library, resources as well as features.

With drag-and-drop controls, real-time previews, and seamless Microsoft integration, you can use ClipChamp to combine clips and audio effortlessly. Also, its extensive stock library of sounds, music, and video templates helps creators produce polished, professional-quality videos in minutes.

There are also some AI tools you can try out. For instance, automatically trim silences, supress background noises. Elevate videos with music and sound effects without sparing any effort.

How to Combine Audio and Video with ClipChamp

Step 1

Get to ClipChamp's editor via browser, sign in with a Microsoft account to access its editing panel.

Step 2

Under the Your Media section, import videos and audio files to ClipChamp, and then drag them to the timeline.

Step 3

Drag and drop the slider the trim the audio and video. More advanced editing tools are to your right side.

Merge Audio and Video with ClipChamp

7. 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.

8. iMovie

iMovie is a video editor that is equipped on all Mac devices. Most people use it to do lots of professional video editing. If you happen to be a Mac user, do use iMovie to combine audio and video. Merging audio and video is not a complicated editing.

Besides being easy to merge audio and video, you can export your video and audio in high resolution. The shortcoming of using iMovie is that iMovie only supports video that's 16:9. If you have a vertical video at hand, it might disappoint you.

How to Merge Audio and Video with iMovie

Step 1

Launch iMovie on your Mac, create a new video project. Drag and drop your videos and audio files into the timeline.

Step 2

Drag the video or audio to seamlessly align them. You can make other edits like spilting clips, adding transitions, applying transitions, etc.

Merge Audio and Video with iMovie

9. OpenShot

OpenShot is an open-source video editor available for all. It is free to use. As long as you have downloaded it to your computer, you can use Openshot to do all kinds of video editing, including merging audio and video.

Similar with other video editing tools, OpenShot is a timeline based video editor. Drag and drop your video and audio and sync them, you can have your video with sound in seconds.

How to Merge Audio and Video with OpenShot

Merge Audio and Video with Openshot

10. VSDC

VSDC is a free multimedia suite brings a set of tools for putting a video together. It can help you more than just merging audio and video. You also have the option to improve audio, use filters, do color correction to level up videos and photos.

We don't encourage you to buy its pro version, because the basic version is good enough if you just want to merge audio and video.

How to Merge Audio and Video with VSDC

Merge Audio and Video with VSDC

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 10 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.