Add Audio to Video Online
Add music, voiceovers, and sound effects to your video right in your browser. Arrange and adjust your audio, then export it when it sounds right.
Over 1 million creators use Flixier every day including brands like:
How to Add Audio to Your Video
Sync Your Favorite Tracks to Your Video
Add Music and Voiceovers
Import audio straight from Google Drive, your phone, or your computer with no extra steps or file conversions. Drop it onto your video and trim it to fit exactly where you want it.
Balance Volume Automatically
Use Flixier’s AI audio enhancer presets to automatically balance volume levels on your audio track. Lower background music under dialogue without having to manually adjust every clip.
Add Free Stock Audio
Skip external stock sites and copyright risk. Choose from Flixier's built-in library of over 4 million royalty-free music and sound effect tracks, ready to drop straight onto your timeline.
Layer Multiple Tracks
Add background music, voiceovers, or fun sound effects on separate tracks. Control the volume and timing of each audio track independently.
Everything you need to create
and finish AI videos
Why Use Flixier to Add Audio to Video
Never Switch Tools
Add and adjust audio in the same browser tab where you're already editing your video, without switching to a separate audio tool.
Create Your Own Voiceover
Record your own voiceover in Flixier, import a track from your phone, or generate a text-to-speech voiceover right in the editor.
Preview Before Exporting
Hear how the audio and video sound together, and use the timeline to sync your audio and adjust volume levels before exporting.
Fade Audio In and Out
Apply a fade-in or fade-out to any audio clip, so music or voiceovers ease in and out instead of cutting off abruptly.
Unlike any tool
you've used before
I have over 11 years in the broadcast industry, building teleproductive facilities, using high-end editing equipment. And this is better than anything else I've used in my lifetime.
Still have questions?
We got you!
How can I add music to videos online for free?
Upload your video to Flixier's browser-based audio editor and drag a music track onto the timeline. The free plan supports videos up to 2 hours long and includes access to the built-in royalty-free music library.
How do I add a voiceover to video?
Upload a pre-recorded voiceover file, record it directly in Flixier, or generate an AI voiceover. Once it's on the timeline, you can arrange it however you like to synchronise it with your video.
Can I layer multiple audio tracks on one video?
Yes. With Flixier, you can add background music, voiceovers, and sound effects to the same video, each on its own track, and mix them independently.
What audio formats does Flixier support?
Flixier supports MP3, WAV, AAC, OGG, and FLAC. Upload compressed files for quick web use, or go for higher-fidelity formats when you need studio-quality source audio.
Can I fade audio in and out?
Yes. You can apply a fade-in or fade-out to any audio clip in Flixier, so transitions between music, dialogue, or sound effects feel intentional rather than cut off.
What audio formats does Flixier support?
Flixier supports MP3, WAV, AAC, OGG, and FLAC. Upload whichever format your audio is already in, no need to convert it before adding it to your project.
